Henry radio 3k classic mark ii Operating instructions

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LINEAR

-

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AMPLIFIERS

Henry 3K-Classic

Henry 3K-Classic X

Operating

and

Maintenance Manual

I

3K

Classic and

3K

C/ass/c-X Specifications

TYPE

AND

FUNCTION

OF

EQUIPMENT:

A

2000

watt

(3000

watt

for

X model)

PEP

input

RF

linear

amplifier,

operating in

the

3.5

to

30.0

MHz

range.

Designed

for

amateur, commercial,

military,

or

indus-

trial

communications.

.

TYPE

OF

EMISSION:

SSB,

AM,

CW,

FM,

RTTY.

OUTPUT

POWER:

1200

watts

PEP

nominal

(2000

watts PEP

nominal

for

X

model).

DRIVE

POWER:

60

to

100

watts.

DIMENSIONS:

323f4"

High x 161

k"

Deep x

15"

Wide.

SHIPPING

WEIGHT:

190

Ibs

approximate.

DUTY

CYCLE:

Continuous

duty

operation

at

rated

output.

POWER

REQUI

REMENTS:

230

VAC,

3

wire,

single

phase,

50/60

Hz,

30

amps.

ALC

CIRCUIT:

Prevents overdrive

from

high power

exciters and boosts.average

talk

power.

COOLING:

Forced

air

cooling.

PLATE

POWER

INPUT:

SSB·

nominal

average

input

of

2000

watts

PEP

with

speech.

Distortion

products are

at least 35

dB

down

from

the

s

ig

nal.

FREQUENCY

RANGE:

80

meters·

3.5 -

4.0

MHz

40

meters·

7.0 -7.5

MHz

20

meters -14.0 -14.5

MHz

15

meters -21.0 -21.5

MHz

10

meters -

28.0

-

30.0

MHz

10

meters available

on

the

X model

only.

Amplifier

will

work

on all

WARC

bands and

most

frequencies

between 3.5 and 30

MHz.

OUTPUT

IMPEDANCE:

52

ohms unbalanced

with

SWR

not

to

exceed 2:1.

TUBE

COMPLEMENT:

Eimac

8877

ceramic

triode.

INPUT

IMPEDANCE:

52 ohms,

tuned

input

circuits.

HARMONIC

AND

SPURIOUS

RADIATION:

Second

harmonic

better

than

-50

dB.

Third

order

distortion

better

than

-35

dB

at

full

power

output.

NOISE

LEVEL:

-40

dB

or

better

below

one

tone

carrier

at

1000

watts

output.

CONTROLS:

Band selector, load

control,

tune

control,

meter switch, standby

switch,

SSB/CW

switch,

circuit

breaker,

primary

fuse, and combined

power

on/off

and

CB switch.

INDICATING

DEVICES:

Two

panel ·meter's

monitor

plate voltage, plate

current,

and

grid

current.

REAR

PANEL

CONNECTIONS:

RF

input

(BNC

type

connector),

RF

output

(UHF

type

connector),

ALC

(RCA

type

jack),

Relay

(RCA

type

jack).

PROTECTIVE

DEVICES:

High voltage shorting

switch,

interlocked

panel,

air

flow

switch,

primary

fus

e,

primary

circuit

breaker, and cathode fuse.

PLATE

VOLTAGE:

SSB:

2200

-

2400

VDC

(X

Model) SSB:

3700

-

3900

VDC

CW:

1700

-

1900

VDC

(X

Model)

CW:

2700

-

2900

VDC

SPECIAL

FEATURES:

Resonant choke

input

and

oil

filled

capacitor

in

the

power

supply

for

superb

dynamic

regulation in

the

high voltage

supply.

The antenna

automatically

transfers

to

the

exciter

when

the

switch

is

in

the

standby

position

or

the

power

is

off.

Semiconductor

diode

rectifiers

guaranty

long and

reliable

life.

Advanced, fast-acting relay circuits

for

semi-break-in

CWoperation.

DC reiay system

for

hum

free

operation.

Pi-L

plate

circuit

with

silver plated

tank

coil guaranty

cleanest most

efficient

output.

.

All

aluminum

cabinetry

with

double

shielding

in

the

RF

areas guaranty

minimum

cabinet

radiation.

El

RF

DECK

INTERIOR*

*shown

with

10 meter coil

(for

export

only)

r-

HENRY

3K·CLASSIC AND 3K·CLASSIC X OPERATING AND MAINTENANCE MANUAL

SECTION 1

The

3K·Classic

amplifier

is

a

high·quality,

one-stage

linear

amplifier

using

one

rugged, high-gain

Eimac

8877

ceramic

triode

operating

in a

grounded

grid

circuit.

The

equipment

is

a

completely

self-contained

floor

model

2000

watt

PEP

input

amplifier

(3300

watts

for

the

X

model)

using

only

the

highest

quality

compon-

ents

that

are available.

In

the

tradition

of

Henry

ampli-

fiers,

the

3K-Classic

is

designed

for

complete

linearity

and conservative

operation,

resulting

in clean signals

with

no

RF

interference.

The

amplifier

is

designed

for

SSB, CW,

or

RTTY

(AFSK

or

FSK)

operation

in

the

amateur

bands between 3.5

and

30

MHz.

The

amplifier

can be

modified

for

frequencies

outside

the

amateur

bands

for

commercial

or

military

operation.

The

3K-Classic

is

factory

wired

for

220

VAC

operation.

Please read

the

operating

instructions

to

familiarize

yourself

with

the

equipment

before

attempting

opera-

tion.

Please

note

the

following

operating

cautions:

CAUTION:

There are lethal high voltages present

inside

the

amplifier

whenever

the

amplifier

is

in

the

SECTION 2

SECTION

2.1

UNPACKING

Remove

the

amplifier

from

its

shipping

carton

and

packing

material,

and

examine

it

carefully

for

visible

damage.

If

the

linear

has

been damaged

in

shipment,

save

the

box

and

packing

material

and

notify

the

trans-

portation

company

immediately.

It

is

wise

to

save

the

box

in

any

case

because

it

is

expensive

to

replace and

will

be useful in

protecting

the

3K-Classic

should

you

ever

decide

to

ship

or

move

it

to

another

location.

The

amplifier

is

shipped

ready

to

operate

with

the

exception

of

a

power

plug. A

power

plug

that

mates

with

the

power

socket

at

the

operating

location

must

be

properly

installed

as

described in

Section

2.3

before

the

unit

can be

operated.

The

following

accessories

should

be

included

with

each

amplifier:

.

1 I

nstruction

Manual

1

Warranty

Card

1

PL-259

Coax

Connector

1

Drive

Cable

(RG-58)

2 Shielded

Control

Cables

5

3AG,

1.5

amp

Fuses

5

8AG,

1.5

amp

Fuses

1

Tube

Puller

SECTION

2.2

OPERATING

LOCATION

The

amplifier

may

be located wherever desired

provided

there

is

adequate air

flow

from

the

bottom

of

the

unit

up

through

the

top

and

back

of

the

amplifier.

Do

not

INTRODUCTION

POWER

mode.

Never

remove

the

top

cover

or

back

panel

without

excercising

utmost

caution!

CAUTION:

The

8877

requires

90

seconds

of

warmup,

regardless

of

how

long

the

amplifier

has

been

turned

off.

Under

normal

operating

conditions

the

delay

relay

will

indicate

the

warmup

period.

However

if

the

amp-

lifier

is

turned

off

after

it

is

warm

and

turned

on

again

within

a

few

seconds

the

delay

relay

may

not

indicate

warmup.

THE

TUBE

STILL

REQUI

RES

90

SECONDS

WARMUP,

AND

WILL

BE

DAMAGED

IF

IT

IS

OPER-

ATED

BEFORE

IT

HAS

WARMED

UP!

NOTE:

The

8877's

performance

is

very

sensitive

to

filament

voltage.

Before

operating

the

amplifier

check

that

the

filament

voltage

is

correct

as

described

in

the

manual.

NOTE:

The

8877

may

be damaged

if

grid

current

exceeds

approximately

80

mao

INSTALLATION

restrict

the

airflow

of

the

amplifier,

and

do

not

place

it

too

close

to

a

wall

which

might

restrict

the

airflow

out

of

the

back

of

the

unit.

You

will

require

a

location

that

has an

appropriate

220

VAC

power

source. A

location

which

avoids

environmental

extremes

of

heat,

humidity,

and

dust

will

keep

the

amplifier

new

looking

and assure years

of

reliable

operation.

SECTION

2.3

CABLING

All

of

the

following

cables

must

be connected

before

operation

of

the

amplifier.

POWER

CABLE·

The

3K

-Classic

is

equipped

with

a

3

wire

power

cable

that

is

connected

for

220

VAC,

single phase,

60

Hertz

operation.

A

factory

modifica

-

tion

is

required

for

50

Hertz

operation.

The

three

wires

in

the

power

cable are

black,

white,

and

green.

The

green

wire

is

the

chassis

ground

and

the

neutral

on

the

220

volt

plug.

The

black

and

white

wires

connect

to

the

"hot"

220

VAC

circuits.

A

power

plug

is

not

supplied

because

there

are

many

different

types

of

220

VAC

outlets.

We

suggest

that

you

consult

with

a local

electrician

for

the

proper

connection

of

your

plug

type

.

CAUTION:

The

amplifier

will

be damaged

if

the

green

wire

is

connected

incorrectly

.

Make

sure

that

the

green

wire

is

connected

to

the

neutral

connection.

ANTENNA

COAX

-

Use

only

RG-8/U coax

(or

its

equivalent)

to

connect

the

3K-Classic

to

the

antenna.

A PL-259,

UHF

type

coax connector,

is

included in

the

accessory

kit.

Prepare the cable and connector

as

described in Figure 1 below. The PL-259 mates

with

the

coax jack marked

OUTPUT

on

the

rear panel

of

the

amplifier.

CAUTION:

Do

not

operate the

amplifier

without

a load

or

into

a load

with

an

SWR greater than 2:1

(reflected power

1/10

of

forward

power). Measure

the

antenna's

SWR

with

an

SWR

meter, using

only

the

exciter, before operating the

amplifier.

With

the

3K-Classic

turned

off,

the exciter's

output

will

pass

through

the

amplifier

directly

to

the

antenna.

DRIVE

CABLE

-The RG-58/U drive cable connects

to

the

INPUT

connector on the rear panel

of

the

ampli-

fier. This connector

is

the BNC

type

coax connector.

The

other

end

of

the cable

is

terminated

by

a PL-259

plug and should

be

connected

into

the

RF

output

connector

of

the

exciter.

An

adaptor may have

to

be

used

if

the

exciter

does

not

have a matching connector.

ALC

(Automatic

Level

Control)

CA.BLE -Plug

the

grey

ALC

cable

into

the

ALC

OUT

phono

socket on

the

rear panel

of

the

amplifier

and

into

the

ALC

feed-

back connection on the exciter.

If

the exciter does

not

have

provision

for

feedback

of

ALC

voltage

from

an

amplifier,

simply

ignore

the

amplifier's

ALC

socket

and cable.

RELAY

CABLE

-The gray relay

control

cable should

be

plugged

into

the

RCA

phono

socket marked

RELAY

CONTROL

on

the rear panel

of

the

amplifier.

This

cable conducts the keying signal

from

the exciter

to

switch

the

amplifier

to

the transmit

condition

and

must

be

plugged

into

the

socket

or

connector marked

antenna relay

(or

its equivalent) on the exciter. The

exciter

needs

to

supply

only

a shorting relay contact

(closed

to

ground during

transmit)

to

key

the

amplifier.

CAUTION:

Do

not

apply

any voltage

to

the

relay

jack.

The internal relay

is

activated by a self-contained power

supply.

When the 3K-Classic

is

driven

by

an

exciter

without

an

antenna relay socket

It

may

be

necessary

to

examine

the

circuit

diagram

of

the exciter

to

find

an

available

unused relay contact

that

Is

normally

open in

the

receive

condition.

All

current transmitters and trans-

ceivers

currently

manufactured

for

amateur operation

have such a relay contact at a terminal board

or

con-

nector

on

the

rear panel.

ii

iiiiiiiiiiiiiii.

·

~1F

.;i,

..

~

IJIIIII·

SECTION

2.4

200/208

VAC

OPERATION

The 3K-Classic

is

normally

factory

wired

for

220

VAC

unless otherwise ordered. The

following

transformer

~

terminal changes must

be

made

if

the

amplifier

is

to

be

operated at a lower line voltage.

FILAMENT

TRANSFORMER

-The

filament

trans-

former

is

marked EAC-1116 and

is

located on

the

upper deck

of

the

power

su

pply

section.

For

220

VAC

operation

the

primary

should

be

tapped on terminals

"c"

(common)

and

"3".

For

200

VAC

or

208

VAC

operation

the

wire

on

tap

3

should

be

moved

to

tap

number

1.

HIGH

VOLTAGE

TRANSFORMER

-The high volt-

age

transformer

for

the

3K-Classic

is

marked ECA-

1120. The

primary

connections

for

220

VAC

oper-

ation

should be:

Tap 1 - 200

VAC

Tap 2 -

jump

to

tap

4

Tap 3 -

n/c

Tap 4 -

jump

to

tap

2

Tap 5 -

n/c

Tap 6 - 200

VAC

The high voltage transformer

for

the

3K-Classic X

is

marked ECA-1171 and

is

located on the

bottom

level

of

the

power supply section. The

primary

con-

nections

for

220

VAC

operation should be:

Tapl-220VAC

...J

_

Tap 2 -

n/c

Tap

3·220

VAC

The

primary

connections

for

200

VAC

or

208

VAC

operation should be:

Tap 1 •

n/c

Tap

2·200

VAC

Tap

3·200

VAC

Cut

end

of

cable

even.

Remove

vinyl

jacket

I);,

",

except

83

·

ISP

plug

remove

vinyl

jacket

I~".

Bare

Va"

of

center

conductor,

Trim

braided

shield,

Slide

coupling

ring

on

cable,

Tin

exposed

center

conductor

and

braid

,

S

crew

the

plug

sub·asse

mbly

on

ca

b

le.

So

l

der

assembly

to

braid

through

solder

holes

,

making

a

goo

d

bond

between

braid

and

shell.

Solder

conductor

to

conlact

.

Do

not

use

excessive

heat.

For

final

assembly,

screw

coupling

ring

on

plug

sub·assembly.

Figure

1.

PL·259 Installation Instructions.

SECTION 3

OPERATING

CONTROLS

SECTION

3.1

FRONT

PANEL

CONTROLS

OFF/ON

POWER

SWITCH

-This

switch

is

used

for

turn-

ing

the

amplifier

on

and

off.

It

is

also a

circuit

breaker

for

overload

protection

on

the

AC

lines. When

the

3K-Classic

is

turned

off

or

the

amplifier

is

in

standby,

the

output

of

the

exciter

passes

through

the

amplifier

directly

to

the

antenna.

MULTIMETER

AND

RELAY

CONTROL

SWITCHES

-

These push switches are located

below

the

multimeter.

There are

two

interlocked

pairs.

The

two

on

the

left

allow

the

operator

to

use

either

the

10,000

volt

scale

or

the

100

ma

scale

for

grid

current

on

the

multimeter.

The

right

pair

enables

or

disables

the

control

circuitry

of

the

amplifier.

This

makes

it

possible

fo

r

the

operator

to

use

the

exciter

alone

without

turning

off

the

power

switch

of

the

amplifier.

CW/SSB

SWITCH

-

this

2-position

rotary

switch

selects

between

two

plate

voltages

to

assure

correct

loading and

output

for

each

type

of

emission.

PLATE

CURRENT

METER

-This

meter

monitors

the

plate

current

of

the

8877

tube.

Nominal

plate

current

is

between

800

and

900

ma

for

full

output.

PILOT

LIGHTS

-When

the

amplifier

is

turned

on,

the

dial lights

wi"

come

on

indicating

that

the

POWER

switch

is

on.

FUSES -

There

are (2)

3AG

11/2

amp fuses. One

is

for

the

meter

circuit.

The

other

is

for

the

blower

and

low

volt-

age

control

circuit.

LOAD

CONTROL

-This

control

matches

the

amplifier'

s

output

network

to

the

load. Refer

to

the

calibration

table

for

appropriate

initial

settings

for

the

frequency

range desired. A

LOAD

setting

of

0 (zero) corresponds

to

minimum

loading and a

LOAD

setting

of

100

corres-

ponds

to

maximum

load

capacitor

mesh.

TUNE

CONTROL

-

The

TUNE

control

is

a

20-turn

vernier dial connected

to

the

variable

inductance

tank

coil.

The

TUNE

control

reading can be used in con-

junction

with

the

setting given

in

the

calibration

table

to

adjust

the

tank

coil

for

the

approximate

tuning

range

to

be used.

BAND

SWITCH

-

The

BAND

switch

selects

the

necessary

input

and

output

circuits

for

the

amplifier

to

operate

in

anyone

of

the

following

frequency

ranges:

80

3.500

to

4.000

MHz

40

7.000

to

7.500

MHz

20

14.000

to

14.500

MHz

15

21.000

to

21.500

MHz

10

28.000

to

30.000

MHz

(Ex-

port

and

military

sales

only)

The

amplifier

can be operated

on

many

frequencies

outside

these bands

by

switching

the

amplifier

to

the

band closest

in

frequency

to

the

desired

operating

frequency.

Never move

the

BAND

switch

when

the

amplifier

is

keyed.

SECTION

3.2

REAR

PANEL

CONTROLS

ALC

JACK

-

This

socket accepts an

RCA

phono

plug (an

ALC

cable

is

provided

in

the

accessory packet

of

the

amplifier).

The

ALC

feedback

to

the

exciter

is

available

at

this

socket.

ALC

ADJUSTMENT

POTENTIOMETER

-

This

po-

tentiometer

controls

the

sensitivity

of

the

3K-Classic

circuit.

Refer

to

the

operating

instructions

for

the

adjustment

procedure.

RELAY

CONTROL

JACK

-

The

RELAY

CONTROL

jack

accepts an

RCA

phono

plug

(a

relay cable

is

pro-

vided

in

the

accessory packet

of

the

amplifier).

When

the

socket

is

shorted

to

ground,

the

amplifier's

antenna

relay

closes.

If

the

amplifier

is

turned

off

the

relay

wi"

not

key. Never

apply

any

voltage

to

this

socket.

RF

INPUT

CONNECTOR

-This BNC coax

connector

accepts

the

drive

line

from

the

exciter.

The

input

im-

pedance

of

the

amplifier

is

50

ohms.

RF

OUTPUT

CONNECTOR

-

The

nominal

output

impedance

of

the

amplifier

is

50

ohms.

Do

not

operate

the

equipment

without

a load,

or

into

a load

with

an

SWR

of

more

than

2:1.

Use

only

RG-8/U

coax

(or

its

equivalent)

to

connect

this

50-239

connector

to

ap-

propriate

antenna

or

dummy

load.

GROUND

LUG

-

This

lug

is

provided

to

ground

the

amplifier.

Connecting

the

amplifier

to

a standard 3

electrical system

is

usually adaquate

grounding.

If

such a

system

is

not

used,

it

is

wise

to

ground

the

unit

using

the

ground

lug and

connecting

it

to

a

good

earth

ground

to

prevent radiated

interference

or

the

danger

of

electrical

shocks.

CATHODE

FUSE

-This 8

AG,

1.5

amp

fuse protects

the

cathode

c

ircuit

from

shorts. Never exceed

the

recom-

mended

current

rating

when

replacing

the

fuse.

POWER

CORD

-

The

power

cord

must

be connected

to

an

appropriate

power

source.

No

power

plug

is

provided.

Be

certain

that

the

power

transformer

is

jumpered

correctly

for

the

appropriate

line

voltage.

See

Figure 1.

Multlmeter

Plate

Meter

Power

Switch

Standby

Band Power

Ught

Switch

Ught

..

o

FUM

Power

FUM

Switch

Tune

Load

Control

cathode

Relay

Fuse

ALC

Control

@ @

~

•

~

@

(])

Ale

Output

,AdJust

Input

(0

•

CO

~

"'"

/

Air

Filter

Adjustable

FMt

Serial

Number

Tag

~

D

t.,

(0

-

(0

If

e

7.

8

Power

Cord

r

SECTION 4

SECTION

4.1

PRELIMINARY

SETTINGS

Turn

on

the

3K-Classic

by

the

circuit

breaker

on

the

lower

half

of

the

front

of

the

cabinet.

The

dial

lights

will

glow

and

the

blower

will

turn

on

.

There

is

a

90

second

warm-up

timer

for

the

8877

tube.

When

the

timer

activates,

one

of

the

two

indicator

lamps

will

light

,

depending

upon

whether

the

"stand-by"

or

the

"power"

switch

is

actuated.

Until

the

8877

tube

is

warmed

up,

no

operation,

other

than

"barefoot,"

is

possible. Set

the

multimeter

switch

to

HV.

It

should

read

approximately

2400

VDC

in

the

SSB

position

and

approximately

1600

VDC

in

the

CW

position.

With

no

drive

applied

from

the

exciter

but

with

the

excite!'

in

transmit

in

the

"CW"

position,

the

resting

current

should

be

approximately

60

rna.

The

output

of

the

amplifier

should be

connected

to

a

50

ohm,

100

0

watt

dummy

load.

NOTE:

The

8877

tube

will

not

show

color

even

at

its

highest

output.

The

maximum

plate

current

is

appro

xi-

mately

1000

rna.

The

maximum

grid

current

is

approxi-

mately

40

rna. When

the

amplifier

is

tuned

properly,

the

grid

current

should

always

be

less

than

40

rna.

The

grid

current

is

a

good

way

to

show

that

the

amplifier

is

tuned

properly

.

It

will

be

as

low

as

20

rna

under

a

good

tune-up.

Do

not

operate

the

amplifier

higher

than

400

plate

rna

until

you

are satisfied

that

the

amplifier

is

tuned

up

properly

.

Always

use

a

good

wattmeter

as

it

is

an

excellent

"health

meter"

and makes

tune-up

easy.

SECTION

4.2

SSB

OPERATION

Set

the

CW/SSB

switch

to

SSB and

connect

a

1000

RF

wattmeter

to

1000

watts

of

RF

output.

Set

the

amateur

band

that

you

desire

on

the

exciter

and

the

amplifier.

Switch

the

exciter

to

the

CW m

ode

.

Turn

the

output

of

the

exciter

to

zero.

The

resting

current

of

th

e

8877

tube

should

be

approximately

~iIi

as

rna.

ISo

ST

EP

1.

Gradually

turn

up

the

exciter

powe

r

until

about

400

rna

of

plate

current

is

showing

on

the

amp-

lifier.

If

the

factory

dial

settings

noted

in

the

back

of

this

manual have been

followed,

some o

utp

ut

should

be

seen.

Tune

for

maximum

on

the

wattmeter,

alternating

tuning

between

the

load and

tune

dials

for

maximum

output.

STEP

2.

Watch

the

grid

meter.

If

it

is

more

than

half

scale

or

50

rna, reduce

the

"load"

dial

numbers

for

a

loWer reading and

retune

the

"tune"

dial

for

maximum

oufput.

Do

not

drive

the

amplifier

for

more

than

10

seconds

if

there

is

no

output.

Ten

(10)

seconds

tun

e

and

ten

(10)

seconds

off

is

a

good

idea.

STEP

3.

After

500

watts

output

has

been reached

at

the

reduced

current

of

400

rna

on

the

plate, increa

se

the

drive

for

more

output.

Remember

that

every

time

the

plate

current

is

changed

by

more

drive

,

the

im-

pedance has changed. Hence,

the

tuning

will

change.

OPERATION

STEP

4.

When

the

amplifie

r has been

tuned

to

fr

e-

quency,

note

the

dial

readings

so

that

the

operator

can

return

to

that

frequency

aga

in

with

out

retuning.

The

dial readings

will

stay

the

same

for

that

frequency.

STEP

5.

Return

the

excit

er

to

the

SSB

mode

and

speak i

nto

the

amplif

ier

through

the

microphone

attached

to

the

exciter.

The

output

power

peaks

for

speech

should

be

about

1

/2

of

the

meter

reading

during

tuneup.

The

output

reading

will

not

follow

the

speech

pattern.

SECTION

4.3

CW

OPERATION

Follow

the

tuning

procedures above

for

SSB

with

the

exception

that

the

CW/SSB

switch

will

be

on

"CW"

and

the

meter

readings

will

be

about

60

per

cent

of

the SSB readings.

SECTION

4.4

ALe

ADJUSTMENT

The

amplifier

is shipped

with

the

"ALC

ADJUST"

potentiometer

fully

counter-clockwise

(off).

If

the

ALC

feedback

is

used,

the

adjustment

need be made

only

once,

un

less

a

new

exciter

is

used.

Afte

r

the

ALC

ad-

justment

is

made, use

the

locknut

on

the

potentiometer

shaft

to

lock

the

control

in

place.

Wi

th

the

"ALC

ADJUST"

control

fully

counter-clock

-

wis

e,

tune

the

amplifier

for

SSB

operation.

Drive

the

amplif

ier

to

about

800

rna

of

plate

current,

and

then

rotate

the

"ALC

ADJUST"

control

clockwise

until

the

grid

current

just

begins

to

decrease.

If

the

exciter

cannot

drive

the

3K-Classic

to

800

rna

of

plate

current,

leave

the

"ALC

ADJUST"

potentiometer

in

the

fully

counter-

clockwi

se

position.

The

ALC

circuit

will

prevent

over-drive

from

high

powered

exciters

when

it

is

adjusted

properly.

How-

ever,

if

your

exciter

does

not

put

out

much

more

than

100/120

watts,

it

is

suggested

that

the

ALC

connection

is

not

necessary

as

th

e

8877

tube

is

difficult

to

over-

loa

d.

SECTION

4.5

ALTERNATE

TUNING

METHOD

When

the

"TUNE"

and

"LOAD"

dial

calibrations

have

been v

erif

ied

for

each band, and

the

operator

feels

com-

fortable

with

the

amplifier,

the

enti

re

tuning

procedure

can be

completed

in

a

few

seconds.

This

alternate

method

(tu

ning

for

maximum

output)

is

done

by

applying

RF

drive

from

the

exciter

to

the

amplifier,

and

bringing

the

RF

reading

of'the

wattmeter

up

to

about

two-thirds

of

full

scale.

Then

adjust

the

"TUNE"

and

"LOAD"

co

ntrol

s

to

peak

the

amplifier

out

put

reading

as

indicated

on

the

multimeter.

The

amplifier

wil

l

now

be

tuned

to

resonance

for

proper

operation.

SECTION 5 ' MAINTENANCE

CAUTION:

ANYTIME

THAT

THE

BOTTOM

BACK

COVER

OR

THE

TOP

COVERS

ARE

OFF,

LETHAL

VOLTAGES

ARE

PRESENT.

PLEASE

BE

CAREFUL.

DISCONNECT

THE

POWER

PLUG

BEFORE

DOING

ANY

WORK

INSIDE

THE

CABINET.

The

following

chart

will

possibly give

the

operator

some

hints

in

the

event

of

problems.

TABLE

1

TROUBLESHOOTING

PROBLEM

CAUSE

REPAIR

The

amplifier

does

not

come

Improperly

connected AC line. Reconnect

the

line

properly.

on

when

the

selector

switch

A fuse

is

blown.

Replace

the

bl

own

fuse.

is

turned

on.

The

power

switch

is

not

closing. Check

it

with

an

ohm

meter.

The

amplifier

turns

on

as

The

switch

is

shorted

or

inop-

Replace

the

switch.

soon

as

the

cable

is

plugged

in

erative.

and

will

not

turn

off.

There

is

no

high voltage in-

The

meter

circuit

is

inoperative.

Check

the

circuit

for

malfun

c

tion.

dication

on

the

multimeter.

No

plate

current

indicated

The

relay

control

cable

from

the

Check

the

cable's

cont

i

nuity.

when

the

amplifier

is

on

and

exciter

to

the

3K-CLASSIC

may

the

exciter

is

transmitting

be bad.

with

no

RF

Drive applied.

RY

may

not

be operating. Check

for

component

malfunction.

If

the

exciter

operates

RY,

suspect Burnish

it,

and bend

the

relay center

a

poor

contact

by

the

center

pole

arm

slightly

to

increase

the

closed

of

the

relay. pressure.

The

plate

meter

shows cur-

RY

is

probably

actuating,

showing

Unplug

the

relay

control

cable.

If

rent

as

soon

as

the

high

volt-

a resting

current

of

150-100

ma

RY

stays

activated,

the

trouble

is

age

is

turned

on

and

the

on

the

plate meter, caused

by

a

not

in

the

exciter.

Check

the

relay

exciter

is

not

transmitting.

short

in

the

relay

control

circuit. circuit.

If

RY

is

not

activated, suspect a grid Replace

the

tube.

filament

short

in

one

tube.

Excessive plate

current.

Bad

tube.

Replace

the

tube.

Cathode Zener

shorted.

Replace Zene.r.

The

3K-CLASSIC

operates Bad

meter

circuit.

Check

the

meter

circuit

for

any

normally,

but

no plate cur-

malfunction.

rent

shows.

An

arc indicates a high

volt-

A

power

supply

high voltage short. Check

for

visible evidence, an arc

age

short:

High

voltage

shorting

switches

ill

usually chars

or

blackens an area.

Unplug

the

high voltage plug

the

RF

deck

may

not

be

properly

Make an

ohm

meter

check.

Start

from

the

RF

deck

and ex- set causing a high voltage short.

with

the

filter

condenser, and

citer.

If

the

short

persists, check

through

the

circuit

toward

it

is

located in

the

power

the

power

tra

nsformer.

Check

supply.

interconnecting

leads

for

a

ground

short.

Check

the

reverse resistance

of

01-02.

When disconnected,

good diodes have

infinite

re-

sistance, and bad diodes read

less

than

2

ohms

resistance

in

either

direction.

If

the

short

is

in

the

RF

deck.

An

RF

deck

high voltage

short.

Check

for

visible evidence.

Make an

ohm

meter

check.

Check

the

high voltage leads.

The

circu

it

breaker

is

activated

Shorted

powertransformer

primary.

Check

for

a

short

and replace.

by

a

short.

A shorted

rectifier

diode. Check

with

an

ohm

meter

as

above

Safety

switches

(H.V.).

and replace.

~

No

plate

current

and excessive Open high voltage

circuit.

Examine

the

circuit

and repair.

grid

current.

No

grid

current

and

the

plate

Exciter

malfunction.

Turn

the

3K-CLASSIC

off.

Operate

meter does

not

drive

up.

the

exciter

to

the

antenna and

check its

operation.

I

ntermittant

grid

current.

Cable between

exciter

and

3K-

Check cable

continuity.

CLASSIC

bad. Repair

the

socket

connection.

Bad socket

connection

in

that

Qperate

on

a

different

band

to

iso-

Bad

input

module.

late

the

problem.

Low

grid

current.

Low

output

from

the

exciter.

Check

the

exciter

output.

SECTION 7. DISASSEMBLING

YOUR

AMPLIFIER

The

description

of

this

procedure

uses

screw numbers

which

are

shown

on

Figure

4.

Therefore

refer

to

that

diagram

as

necessary.

REMOVE

THE

TOP

PANEL

-Remove screws

2,

3,

6,

and

7 and

pull

the

top

perforated

painted

panel

off

of

the

amplifier.

REMOVE

THE

POWER

SUPPLY

BACK

PANEL

-Re-

move

screws

13, 14, 15,

16,

17

and

18

and

pull

the

back

panel

away

from

the

power

supply

section.

You

must

unplug

the

power

cord

from

the

amplifier.

REMOVE

CABLES

-

Disconnect

all

of

the

cables be

tween

the

RF

section and

the

power

supply

section.

REMOVE

THE

RF

DECK

-

First

remove

the

BAND,

TUNE

and

LOAD

knobs

from

the

front

panel. A

spline

wrench

is

provided

with

the

accessory

kit

to

remove

the

knobs

.

Then

remove

tha

two

screws

from

the

bottom

of

the

back

of

the

top

wraparound.

These

are accessed

by

reaching

up

from

the

back

of

the

power

supply

section and

they

are

not

shown

on

the

diagram.

Remove

two

screws

from

the the

bottom

of

the

front

of

the

RF

wraparound,

on

the

bottom

of

the

overhang.

These are

shown

as

screws

19

and

20

on

the

diagram.

The

RF

section

should

now

slide

out

of

the

back

of

the

wraparound.

If

you

should

need

to

send

the

RF

section

back

to

the

factory

for

repair

you

should

just

send

the

RF

chassis,

not

the

entire

painted

wraparound.

Most

service

of

the

amplifier

can be

accomplished

with-

out

any

further

disassembly.

The

front

panel can

now

be accessed

from

the

rear,

the

blower

from

the

top

and

bottom,

and

the

power

supply

from

the

back.

REMOVING

THE

RF

WRAPAROUND

-

Should

you

find

it

necessary

to

romove

the

top

wraparound,

remove

the

seven screws spaced

around

the

inside

bottom

lip

of

the

wraparound.

The

are accessed

through

the

top

of

the

amplifier.

Next,

disconnect

the

metering

harness

and

the

wiring

to

the

blower

(below

the

wraparound).

The

cabinet

will

then

lift

off

of

the

power

supply

.

REMOVING

THE

POWER

SUPPLY

WRAPAROUND

-

Tip

the

power

supply

over

carefully

and remove

the

four

screws

(21,

22,

23

and

24)

holding

the

painted

power

supply

wraparound

on

to

the

bottom

plate

of

the

power

supply.

Tip

the

power

supply

back

upright

and

VERY

CAREFULLY

spread

the

back

edges

of

the

wraparound

and slide'

it

off

the

front

of

the

frame.

The

wiring

to

the

circuit

breaker, SSB/CW

switch,

and

fuses

is

attached

to

the

wraparound

so

be

very

careful.

The

2 level

power

supply

frame

is

welded

and does

not

come

apart.

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CLASSIC

PfllfEI?

SUPPLr

SECTlflll

PL101

PL

102

-= -=

RY102

~

"-

SCHEMAT

Ie

N

2

810119

«

IC108

--'L

SB

OP

GRID

1-----------

I a a a a a a

I

i

\\

\ \ \

LF---q

___

a

__

._

PL104

c:E

PL103

R

105

-= -=

R

104

2

J

104

HV

R113

ClOg

HV

------,

a a I

I

\:

• I

---1---

S101

CI

SECTION 8. PARTS LIST

BLOWER

BIOI.

..............

220

VAC

.•...........................•........

Oayton

2C915A

............

.

CAPACITORS

CIA,

B, and C

.•.......

Mica,

470

pf,

500

VOC

.............................

Arco

OM15-471J

............

.

C2A

and B

...........

Mica,

820

pf,

500

VOC

.............................

Arco

OM15-82IJ,

...........

.

C2C

.............

...

Mica,

620

pf,

500

VOC

.............................

Area

OM15-621J

............

.

C3A

and B

......•....

Mica,

430

pf,

500

VOC

.............................

Arco

OM15-43IJ

............

.

C4A

......•........

Mica,

220

pf,

500

VOC

.................•......••...

Arco

OM15-22IJ

........•....

C4B

and C

..•........

Mica,

390

pf,

500

VOC

.................•...........

Arco

OM15

-

391J:

..

"

.........

.

C5A

and B

...........

Mica,

160

pf,

500

VOC

...........•.

•

...............

Arco

OM15-16IJ

......

..

....•

C6A

and B

...........

Mica,

160

pf,

500

VOC

.............................

Arco

OM15-161J

............

.

C7A

and B

.........

. .Mica,

100

pf,

500

VOC

.....

.

....

. . .

...

.

.•........•.

Arco

OM15-101J

............

.

C8A

and B

...

.

.......

Mica, 91

pf,

500

VOC

............

.

....

.

.......•...

Arco

OM15-910J

............

.

C9A

•..............

Mica, 75

pf,

500

VOC

..

•

...............

•.

•........

Arco

OM15-750J

...........

. .

C9B

.....

..

.....

.

..

Mica,

82

pf,

500

VOC

........

.....

................

Arco

OM15-820J

............

.

C10A

and B

..........

Mica,

68

pf,

500

VOC

.............................

Arco

OM15-680J

...........

• .

Cll

and

C12

.

.....

..

.Ceramic disc,

.0047

mf,

6

KV

........................

Sprague

60GA047

...........

.

C13 and C14

.........

Ceramic

transmitting,

1000

pf,

5

KV

....................

ITT

Jennings

700002

.........

.

C15

...............

Ceramic

transmitting,

25

pf,

15

KV

..........

•

........

.

ITT

Jennings

700014

.........

.

C16A

and B

..........

Ceramic disc, .01

mf,

1000

VOC

......................

Centralab

00-104

...........

.

C17

...............

Ceramic

transmitting,

25

pf,

7.5

KV

.................•..

ITT

Jennings

700024

......•...

C18, C19,

and

C20

.....

Ceramic tr

ansmitting

, 75

pf,

7.5

KV

..........

;

.........

ITT

Jennings

700018

.........

.

C21A,

B, C, and O

.....

.Ceramic

transmitting

,

100

pf,

7.5

KV

...................

ITT

Jennings

700066

.

........

.

C22A,

B, and C

........

Ceramic

transmitting,

100

pf,

7.5

KV

..........

.

........

ITT

Jennings

700066

........•.

C23

..

.....

.

..

...

..

Ceramic disc, .01

mf,

600

VOC

.

..

.

..

....

.....

.

..

•

....

Centralab

006-103

..........

.

C27

..........

.

....

Ceramic

feedthrough,

2000

pf,

500

VOC

.......

•

.........

Trusonix

202M

....

'.'

.......

.

C28A

and

C29A

.......

Ceramic disc,

.003

mf,

1000

VOC

......................

Centralab

00-302

...........

.

C28B

and

C29B

...

..

Ceramic disc,

.1

mf,

50

VOC

.........................

Centralab

00-104

...........

.

C30 and C31

.........

Mica,

47

pf,

500

VOC

.............................

ArcD

OM15-470J

............

.

C33

...............

Ceramic disc, .01

mf,

600

VOC

.......................

Centralab

006-103

..........

.

C34

.......

.

.......

Ceramic

feedthrough,

2000

pf,

500

VOC

.................

Trusonix

202M

.............

.

C35

and C36

..

.

.. .. ..

Ceramic disc, .01

m(

600

VOC

.......

.

...............

Centralab

006-103

..........

.

C37

...............

Variable

air

type,

LOAO

control,

3

KV

...•..............

AII

Star

73-1-75-75

..........

.

C38

...............

Ceramic disc, .01

mf,

600

VOC

.......................

Centralab

006-103

..........

.

C101 and

C102

. .

......

Oil

filled,

.01

mf,

7.5

KV

...

.

....

.

.........

.

....

. . . .Plastic Capacitors

LK80-104

....

.

C103

...............

Oil

filled,

16

mf,

8

KV

..........

. .

.....

............

Aerovox

BX001500008A

......

.

C104

....•..........

Electrolytic,

470

mf,

50

VOC

..................

.

.....

Arco

ME-470-50

............

.

C105

...............

Ceramic disc, .05

mf,

16

VOC

..

•.

.............

.

......

Centralab

UK16-503

.........

.

C106

. . .

............

Oil

filled,

.01

mf,

7.5

KV

(50

Hz

models

only)

.............

Plastic Capacitors

LK80-104

....

.

C107

...............

Ceramic disc, .05

mf,

16

VOC

.........

..

........

. . .

..

Centralab

UK16-503

.........

.

C108

and

C109

.....

.

..

Ceramic disc, .01

mf,

600

VOC

.......

.

...........

.

...

Centralab

006-103

..........

.

CIRCUIT

BREAKER

CB101.

.

.......

..

...

30

amps

..............

•.

.........

..

.

..

.........

P&B

W92Xll-2-30

CONNECTORS

Jl.

.

..

..........

.

..

High

voltage socket and plug

.........................

Millen

37501

.............

. .

J2

.................

RF

in, BNC

type

coax

connector

......................

Amphenol

UG647/U

.........

.

J3

...•.............

Harness connections,

8-pin

keyed socket

.................

Amphenol

7858

......

.

J4

.................

RF

out,

UHF

type

coax

connector

.....................

Amphenol

50-239

..........

. .

J5

...............

. .Relay

control,

RCA

type

phono

jack

...

.................

Switchcraft

3501FP

..........

.

J6

..

.

...........

.

..

ALC

feedback,

RCA

type

phono

jack

...................

Switchcraft

3501FP

...•.......

J7

.................

Filament,

4-pin

Jones plug

.....

. .

...................

Cinch

P404AB

.............

.

J101

...............

AC

input,

4-pin

Jones plug

..........................

Cinch

P404AB

.

............

.

J102

.............

. .Harness

interconnect,

8-pin

keyed plug

..................

Amphenol

86CP8

...........

.

J103

...............

Filament,

4-pin

Jones socket

.........................

Cinch

S404CCT

............

.

J104

...............

High

voltage plug and socket

......

..

.................

Millen

37501

.............

. .

J105

...............

AC

input,

4-pin

Jones socket

(on

power

cord)

..............

Cinch

S404CCT

............

.

OIOOES

01

................

Biasing

diode,

10

VOC,

1.2 amps

......................

Semtech

SA-5534

...........

.

--

02

................

Rectifier,

1.0

amp,

200

PIV,

ALC

....

..

...............

.

Motorola

1N458

...

"

.........

.

0101

and

0102

.......

Rectifier,

1.2 amps,

15

KV

..........................

CSdC

45XV246

..

........

.

0103

and

0104

.....

. .

Rectifier,

1.0

amps,

1000

VOC

......................

.

GE-509

.....

.

............

.

0105

......

...

. .

Rectifier

, 3.0 amps,

100

PIV

.

..

..........

.

.........

..

Motorola

1N4720

...........

.

0106

.

.....

.

.......

Rectifier,

1.0 amps,

400

PIV

.........................

Motorola

1N4004

...........

.

0107

...

....

Voltage

spike

protector,

250

VAC

.....................

GE

V250LA40A

............

.

FUSES

F1

................

8

AG,

1.5 amps,

250

VAC

.

....

. . .

......

.....

...

..

. . .

Littelfuse

361001.5

....

..

...

.

· •

..•.............

Fuseholder, 8

AG

............

.

...................

Littelfuse

372

001A

...........

~

F101

and

F102

. .

....

..

3

AG,

1.5

amps,

25

0

VAC

....

.

....•...

...

.....

......

Littelfuse

312

001.5

.........

.

•

.•...............

Fuseholder, 3

AG

................................

Littelfuse

348

875.

. . . . . . . . .

..

~

KN

OBS

·

..........

..

.....

BAND

switch,

TUNE

and

LOAD

controls

................

Raytheon

175-1-2G

...

.....

..

.

·

.•...............

SSB/CW

Switch

........

.

....

.......

.....

....

.....

Raytheon

70

-7WL-

2G

....

.. ..

.

INDUCTORS

Ll

..........

..

. .

Input

coil,

3.5

MHz

....•......

..

.

.......•......

. .

Henry

Ll-3K-Classic

. . . . . . . . . .

-=

L2

.•

.......•......

Input

coil,

7.0

MHz

..•...........................

Henry

L2-3K-Classic

.........

.

L3

....

..

......

..

. .

Input

coil,

14.0

MHz

.............................

.

Henry

L3-3K-Classic

..

...

....

.

L4

................

Input

coil,

21.0

MHz

..............................

Henry

L4-3K-Classic

.........

.

L5

..

.

..

...........

Input

coil,

2B.0

MHz

..

. . .

......

..

..........

.

......

Henry

L5-3K-Classic

.........

.

L6

................

High

voltage

RF

plate

choke

........

.

...

..

.

..........

Henry

L6-3K-Classic

.........

.

L7

................

Parasitic suppressor

coil

.......

...

. .

..

. . . .

....

.....

.

Henry

L7-3K-Classic

.........

.

LB

.

..

...

.

.........

15

meter

RF

coil

. .

.......

...

..

. .

...

...•........

•.

Henry

L8-3K-Classic

.......

..

.

L8

...

•.

....

. .

..

...

10

meter

RF

coil

(Export

models)

..................

. . .

Henry

L8-3K-Classic X

........

.

L9

................

TUNE

control

rotary

inductor

.

..

..........

....

.......

Henry

L9-3K-Classic

...

.

...

. . .

LlO

...

....

...•.

..

.

L-Section

tapped

coil

.

..

.

....

....................

. .

B&W

1608-002

.....

........

.

Ll1

..............

.

RF

antenna

choke,

2.5

mH,

150

ma

.......

....

..

.......

Miller

4555

...........

....

.

L12

...............

RF

choke

...................

•

..................

Miller

6302

.......

..

...

.

Ll3

.....

....

• .

...

.

Filament

choke

.........................

.. ..

.

....

Miller

B5344

..............

.

Ll4

.........

..

.

..

.

Filament

center

tap

choke

...

.......

.

....

.....

.

......

Miller

6302

...........

.

...

.

LlOI.

.

...

....

.

....

.Resonating

filter

choke,

8

H,

800

ma

...................

ECA5020

.................

.

METERS

M101

..............

Plate

current

meter,

0

to

1

amp

movement.

...............

Beede

913105

.....

..

....

...

.

M102

..

....

.

..

.

..

Multimeter,

0

to

1

ma

movement

......................

Beede

913104

..

....

.

.......

.

PILOT

LAMPS

PLlOl

and

PLl02

......

TUNE

and

LOAD

dial

lights

...•.....................

Sylvania

1815

..

..........

.

·

..

......

...

....

..

Light

holder

assembly . .

...

..

....

..

. .

.....

.

.....

.smith

1931

.....

.........

. .

PLl03

and

PLl04

•.

....

Standby

and Po

wer

light,

12

VDC

.........

•

........

.

..

Sylvania

330.

. . . . . . . . . . . . . . .

.,.-/

·

....

......

.

......

Light

holder

assembly

.....

.

...

......

...

......

. .

Compulite

621-1-B

..........

.

RELAYS

RY1

and

RY2

.........

Antenna

changeover, 12

VDC,

2PDT

..

..................

Guardian

1365PC-2C

-12D

......

.

·

.................

Relay socket

.....

.

.........

...

.......

.

.....

.

....

Guardian

136

5

......

.

......

.

RY102

.....

...

.

....

Warmup

delay

r

elay,

90

seconds

.....

.

....

..

.....

.. ..

. .

Amper

it

e

115N090

..........

.

RESISTORS

RIA,

B, and C

........

Carbon,

150

oh

m

s,

2

watts,

10%

...•..................

Resistor.

...

. .

.........

..

. .

R2

..

..............

Wirewound,

10 K ohms,

10

watts,

5%

...................

Resistor. .

................

.

R3

..

.

........

...

Carbon

, 1 K

ohms

, 1

watt,

10% . .

..•.

.

......

...

. . . .

...

Resistor...

.....

.

........

. .

R4

....

............

Carbon,

68

K

ohms

, 1

watt

, 10% .

.. ..

.

..

.......

.....

. .Resistor

................

..

.

R5

.......

....

.....

Wirewound,

100

K

ohms,

5

watts

, 5% .

...

.

.......

..

. .Resistor

......

...

.

........

.

R6

. . .

..•

..........

Carbon

,

220

ohms, 2

watts,

10%

...

........

...

.

...

.

...

Resistor

......

..

.

...

. .

....

.

R102

.

..

...........

Carbon,

150

ohms, 2

watts,

10%

....

...

.

..............

Resistor

..........

..

....

. . .

R103

......

........

Wirewound,

5 K

ohms,

25

watts,

5%

...

..

...............

Resistor

..

.

..............

. .

RI04A

and B

.........

Precision,.l

ohms,

1

watt,

1%

.....

..

.................

Resistor

..........

..

. .

....

.

RI05

....

•

.........

Carbon,

30

ohms

, 2

watts,

5% .

...

......

....

.....

. .

...

Resistor

..

.

.......

...

.....

.

R10

6

......

........

Wirewound,

25

ohms,

25

watts,

5%.

.....

.......

...

..

...

Resistor

..

.

..

.............

.

RI07

through

RllO

. .

...

Wirewound,

20

K ohms,

100

watts,

5% .

..............

.' . .

Resistor.

...

. .

..

..........

.

Rll1

and

R112

.......

Carbon

,

47

K

ohms,

2

watts,

10%.

..

........

.

....

..

....

Resistor.

.................

.

R113

.....

.. ..

...

. .Precision, 10 M

ohms,

7.5

watts,

1%

.......

...

.. ..

..

.

...

Resistor

...

.

..

.

..

....

.....

.

RIl

7 .

.. ..

. . . .

....

.

Carbon,

10 K ohms, 2

watts,

10%

.........

.

..

..........

Resistor

.............

.....

.

R118

.•............

Carbon,

150

ohms, 1

watt,

10%

....

...

..

. .

...

........

.Resistor.

....

•...

..........

R119

....

.. ..

...

Carbon,

50

ohms, 1

watt,

10%

..

.

.....

.

..........

..

...

Resistor

.................

. .

SWITCHES

SlA,

B,

and

C

..

. .

..

.

High

voltage shorting switches

...

.......

.

.......

..

....

Henry

Sl-3K

-Classic

..........

.

S2

.......

..

.

..

BAND

swi

tch,

input

secti

on

.

...

.

..

...

.....

.

.......

..

Centralab

2504

.............

.

S3A

...............

BAND

swi

tch,

TUNE

circuit

section

.....

.

..

......

..

. . . .

Henry

S3A-3K-Classic

.......

• . "'--

S3B

...

......

....

. .

BAND

switch,

L-Section

circuit

.

..

...

....

...

..

.

.......

Radio

Switch

Model

80

.......

.

S101

............

..

.

Function

switch

.

..

.

..

...•..

.

.........

.

...

.

......

Switchcraft

65041

K206

........

.

S102

.......

......

..

Air

flow

protection

switch

................•.........

Rotron

2A-1000

............

:

TRANSFORMERS

TI01.

..

...

....

...

..

High

voltage

power

transformer

-

Domestic

models

..........

ECA1l20

.................

.

TI01.

..............

High

voltage

power

transformer

-

Export

models

............

ECA1l71.

................

.

TI02

...............

Filament

transformer

......................

•

.......

ECA1l16

.................

.

TI03

...............

Relay

power

supply

transmformer

.....................

ECA1l61.

................

.

TUBE

VI

................

Ceramic

power

triode

..............................

Eimac

8877

(3CXI500A7)

.....

.

. . . . . . . . . . . . . . . . . .

Tube

socket

....................................

Johnson

122-0247-202

•........

. . . . . . . . . . . . . . . . . .

Tube

chimney

...................................

Henry

3K-Classic

Chimney

.....

.

/

\

.'

,,-

.

..

!". : \

;.

.-

,

•

v"

,

SECTION

9.

TUNE

AND

LOAD

SETTINGS

Serial

Number

-----

These are

approximate

settings

for

a

52

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Henry Radio 3K Classic Mark II Operating instructions

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