National company Nc-88 User manual

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PHOTOFACT*

Folder

TRADE NAME

SELECTOR

SWITCH

National

Model

NC-88

TONE

SWITCH

NATIONAL

MODEL

NC-88

VOLUME

CONTROL

ON-OFF

SWITCH

MANUFACTURER

National

Co.

,

Inc.,

61

Sherman

St.,

Malden

48,

Mass.

TYPE

SET

AC

Operated

4-Band

Superheterodyne

Communications

Receiver

TUBES (Nine)

Types

6BA6

RF

Amp.,

6C4

Osc.

, 6BB6

Mixer,

(2)

6BD6

IF

Amp.,

6AL5

Det.

-AVC-

Noise

Limiter,

12AX7 CW

bsc.-AF

Amp

.,

6AQ5 .Audio Output, 5Y3GT

Rectifier

POWER

SUPPLY

TUNING RANGE

105

/

130

Volts

AC-50

/60

Cycles

Band "A"

-540-l600KC

Band

"B"

-1.

6-4.

7MC

RATING

.56

Amp

. @

117

Volts

Ac

Band

"C"-4.7-l4

.

0MC

Band "

D"-14.0-40MC

HOWARD

W.

SAMS

&

CO.,

INC.

Indianapolis

5,

Indiana

"The listing

of

any

available

replacement

part

herein

does

not constitute

in

any

case

0 recommendation,

warranty

or

guaranty

by

Howard

W.

Sams & Co., Inc.,

as

to the quality

and

suitability

of

such

replacement

part

. The numbers

of

these

ports hove

been

compiled from information furnished

to

Howard

W.

Sams & Co.,

Inc., by the manufocturers

of

the particular

type

of replacement port listed."

"Reproduction or use, without express permission, of editorial or pictorial can·

tent,

in

any

manner

,

is

prohibited.

No

patent

liability

is

assumed

with

respect

to

the

use

of

the information

contained

here

in. Copyright

1954

by

Howard

W.

Sams & Co.,

Inc

., Indianapolis

5,

Indiana,

U.

S.

of

America.

Copyr

ight

under

In

·

ternational

Copyright Union.

All

rights reserved

under

Inter·American Copyright

Union (1910>

by

Howard

W.

Sams & Co.,

In

c."

Printed

in

U.

S.

of

America

DATE

3-54

SET

233

~

OZ

C~

m-l

r- -

zO

nZ

.~

cor-

CO

FOLDER

7

o

CBAND

CHASSIS

BOTTOM

VIEW-CAPACITOR

IDENTIFICATION

~

0

56

00

liL

,ooo

i

,

I

,

\

I

,

1

______

---

@,

1

RfAMl'

@6BA6

200V

@

..

~

MIXER

@6BE6

1ST

IF

AM~

@l

i----~--[ill---l

@

6B.rD6-;;;;;,,-_-+r_--_-...,-~--@J---l

[email protected]

-:---------~;::::::;

....

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.,

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JF

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~,

00,

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'1000

~:.

@.~

~

§~

!@CJI!i!lji(I----,........----,'M"C

@

I'~~~

~

I'::''',!'

~

i

'EAR

h

J,~

J~R

,..

~

~'=

'~j~~A

i

r--_~:_:~-'o~'_I_++-+_'

,..@:{

~6°~::

,@o:u@F

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r-

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-+11-+-+-_-'~=::A11

in'\_-_=__+_+

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tt

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i

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~

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rL~

t~·~

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®

15K

@

~

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oi}-

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M~

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I ~;o

~ji('r-~=--~~~~

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:'~[

I I

~~

0 '

@)

:

I-!

BAND

SELECTOR

I!Wl1'CB

SHOWN

IN

"A"

BAND

SWITCH

SEQUENCE:

1·

"A"

BAND

2 _

"8"

BAND

@

15K

!

~l~:

~

i :

-------------

__________________

1

______

@-

_____

- -

---------~--::--------

- -

~---.

i

~:':.~:'.=

IF=455KC

I

,

----------------------@----------------------------------------------~

THE

COOPERATION

OF

THE

MANUFACTURER

OF

THIS

RECEIVER

MAKES

IT

POSSIBLE

TO

BRING

YOU

THIS

SERVICE

@i

"

Mro

AI'

AMP

@a12AX7

SW

ON

VOL CONT

®

lOOVAC

~Ih

I-----~

lOOVAC

S40V

l40V

REeT

@5Y3GT

~

---r®

TO

FILS

'1

r®

-::-

-=F

A PHOTOfACT

STANDARD

NOTAnON

SCHEMATIC

©Howard W. Sams & Co., Inc. 1954

r-<""

0 STANOB't

....

VI

V2

v,

V4

V5

V6

r--

V7

v 8

V9

RESISTANCE

READINGS

,

....

PI."

PI,2

PI,'

PI,4

""5

.....

.BA.

I.Bldeg

00

OD

.m

ffllfl"

.=

6C4

j22Kn

INF

.m

o.

to=

471:0

6BE6

4=

..

0.

00

.Ill

t12KD

t160m

.BDO

1.6Mog

00

.10

on

t'''''

tlOOKn

6BD6

I.SMag

on

...

on

.10

I

t4.'Ko

tlO5KQ

~.-.

on

r--"

270m

On

on

B.5Meg

on

l2AX7

t5.0K~_

lOOKO

00

On

on

t720KO

OAQ'

500KU

2700

.10

00

t2.3KO

to""

6Y30T

INY lMeS

.-

INF

900_"

on

95.

~

':t~'l\VJ:lil&

~Wt1l;rot

qro·Y&.ND

.

.f.

MICASU1tED IN "CW"

POSITION

..

SKN81'rlVlTY

AT

MINIMUM

(FULLY

COUNTER CLOCKWISE)

•

SICNSITMTY

AT

MAXIMUM

(FULLY

CLOCKWISE)

""'7

""8

PI,

•

~,*n-

on

35.

i:-

f:°:!cn

..

=

lOMeg

OD

.10

50QKO

.ill

lMeg

VOLTAGE

&

RESISTANCE

MEASUREMENTS

TAKEN

ON

HANn

"A"

UNLESS

OTHERWISE

NOTED.

PAGE

3

1.

DC

voltll8e melLllllremerlia t""en with

neuum

rub

...

"rrn,.IN,

ACvollaguQteaSlll'edatlOOOohmapervulr.

2.

lluckl!l

eon1lltctimBaN

aholm

lUI

bottom ylvwa,

3.

Me

...

"rO'd

yaluea

arefromaoeket

I"~"n'n""'

"

.......

.

~.

L.I~~

yolta!:e

J(la\lItalnad

lit

II'

voila

lor

.,,11l1li"

.....

,,''11.

5. Nominal toler;lJl(e

on

comPORent Vailll!8

mak~"

I,,,~~,

..

t~

~

...

laIlnnol

..

l,.,lnvoltapandrea1.t.l'C

.....

oIl

....

s.

~!i::~~

..

t.:!~

at maxilll\llll, noBill"..L .ppllod

I",

.,,11

...

2ND

IF

AMP

DEl·Ave

@ 6BD6

r-------------------,

®

..

6AL5

r-..""--..;l-..,lm@].----1!_-I""""':.eGI9-1

___

"""

l~i'ff

I t

lt~L

.~'V.l

~~!I

I-SV"'='"

!

@.

I~~

~

I

MMF

@---

-1

47K

, ,

~

l

____

jt_J

~

8

tl

~

@l'~

~

@)

.-

AUDro

OUTPUT

@6AQ5

..,

....

HEM

PHON<

JACK

233-7

PAGE 4

CHASSIS BOTTOM VIEW-RESISTOR IDENTIFICATION

88-JN'l:3:GOW

'lVNOIJ.VN

ALIGNMENT

INSTRUCTIONS

ALIGNMENT INSTRUCTIONS-READ

CAREFULLY

BEFORE

ATTEMPTING

ALIGNMENT

Volume

control

should

be

at

maximum position. Output

of

signal

generator

should

be

no

higher

than

necessary

to obtain

an

output reading.

Use

an

in-

sulated

alignment

screwdriver

for

adjusting.

Remove external antenna and

turn

sensitivity control

fully

counter clockwise.

Set

the

I!

receive-standby" switch

to

"receive"

position.

Set

ANL-off

switch

to I'offll position.

Set

AM-CW

switch

to

"AM"

position.

Place

the

band

spread

pointer

on

the

"set"

mark

(near

86

on

the log

scale),

Turn

on

receiver

and

test

equipment. Allow

15

minute warm

up

period.

IF

ALIGNMENT

----

DUMMY

SIGNAL SIGNAL

BAND

RADIO

OUTPUT

GENERATOR GENERATOR

SWITCH

DIAL

ADJUST

REMARKS

ANTENNA

COUPLING

FREQUENCY

POS.

SETTING

METER

1. .0lMFD High

side

to lug on

stator

455KC

"A"

Tuning gang

Across

voice

Al,A2,

Adjust

for

maximum deflection.

plates

of

center section

of

(400'l.Mod) fully open

coil

A3,A4,

center

section

of

main

A5,A6

tuning gang. Low

side

to

chassis.

2.

Check

alignment

of

BFO

oscillator

by

placlog AM-CW

switch

to

CW

position.

With

pitch

control

tune BFO

for

zero

~at

with

signal

generator.

Zero

beat

should

occur

when

red

dot

on

pitch

control

is

at

the

top

dead

center

position.

If

necessary,

set

pitch

control

to

place

red

dot,

at

the top

center

position.

Adjust

A7

for

zero

beat.

Return

AM-CW

switch

to

"AM"

position.

RF

ALIGNMENT

Incorrect

mechanical

calibration

is

indicated when

the

frequency

readings

are

off a

certain

equal

linear

amount

on

all

bands. With

the

main tuning gang

fully

closed

place

t)1e

pointer

at

the

first

marker

on

the

"C"

scale

(just

to left) of

4.

7MC

marker.)

With

the

band

spread

tUlling gang fully

closed

set

pointer

to the

zero

marker

on

the

log

scale.

The

oscUlator

operates

on

the

high

side

on

the

"A",

"B"

and "e" bands and

on

the low

side

at

the

"0"

band.

DUMMY

SIGNAL SIGNAL

BAND

RADIO

OUTPUT

GENERATOR

~REE~~~~g~

SWITCH

DIAL

ADJUST

REMARKS

ANTENNA

COUPLING

POS.

SETTING

METER

300[1 High

side

thru

300[1 to

left

1600KC

"A"

I600KC

Across

voice AS,A9

Adjust

for

maximum deflection.

Carbon

hand

antenna

terminal.

Low

coil

Resistor

side

to

chassis

(connect

link

from

terminal

"G"

to

middle

terminal).

" " 600KC " 600KC "

AID

Adjust

for

maximum deflection,

Repeat

steps

3

and

4.

" "

4.0MC

"B"

4.0MC " All,A12 Adjust

for

maximum deflection.

6.

" " 1.6MC " 1.6MC "

A13

Adjust

for maximum deflection.

Repeat

steps

5 and 6.

" " I4.0MC

"C"

14.0MC " AI4,AI5 Adjust for maximum

deflection,

If

Al4

has

two

peaks

use

the peak

closest

to

minimum

capacity

0 H Al5

has

two

peaks

use

the

peak

closest

to maximum

capacity.

" " 5.0MC " 5.0MC " AI6

Adjust

for

maximum

deflection.

Repeat

steps

7 and S.

" " 30;OMC

"D"

30.0MC " AI7,AlS Adjust

for

maximum

deflectiono H

A17

has

two

peaks

use

the peak

closest

to

maxi-

mum

capacity.

H

AlB

has

two

peaks

use

the

peak

closest

to minimum

capacity.

10. " " 15.0MC " I5.0MC " Al9

Turn

Al9

counter

clockwise

as

far

as

possible

then

turn

clockwise

until

second

peak

is

ob-

tainedQ

Adjust

for maximum deflection on

second

peako

Repeat

steps

9 and 10.

PAGE

6

."

;a..

Q

In

c;o

....,

-

.....

....

....,

=

r-

=

....,

....

-..0

PARTS

LIST

AND

DESCRIPTIONS

T

UBES

(SYLVANIA, GENERAL

ELECTRIC

,

WE

STINGHOUSE)

ITEM

No.

USE

VI

RF

Amplifier

V2

Oscillator

V3

Mixer

V4

1st

IF

Amp.

V5

2nd

IF

Amp.

V6

Oet-AVC-

Noise

Limiter

V7

CW

OscUlatOr-

AF

AmplUler

VB

Audio Output

V9

Rectifier

ITEM

RA

TIN

G

No.

CA

P.

VOLT

f-

CIA

,20

450

B

dO

450

C ,20 450

C2 25

SO

C3

220

SOO

C4 10000

CS

10000

C6 10000

C7

SIO

SOO

C8 220

SOO

C9

470

SOO

CIO

. 1000

SOO

CU 3000

SOO

C12

1000

SOO

CI3 10000

CI4 10000

CIS 10000

CI6 10000

CI7 10000

CI8 10000

CI9 10000

C20 10000

C21

10000

C22 10000

C23 .

01

400

C24 10000

C25 .

01

400

C26 47

C27 270

C28 220 500

C29 .01 400

C30 270 500

C31

10000·

C32A .005

B

]250

C

C33 10000

C34 .

04,

400

C35 .1 400

C36 .047 400

REPLACEMENT

DATA

RETMA

NATIONAL

STANDARD

BASE

NOTES

PART

No.

REPLACEMENT

TYPE

6BA6 6BA6 7BK

6C4 6C4

6BG

6BE6 6BE6 7CH

6B06 6B06

7BK

6B06 6B06

7BK

6AL5 6AL5

61.lT

12AX7 12AX7

9A

6AQ5 6AQ5 7BZ

5Y3GT 5Y3GT 5T

CAPACITOR

S

Capacity values given in the rating column

are

in

mid. lor Electrolyt

ic

and Paper Capacitors,

and

in

mm

ld.

lo

r Mica and Ceramic C

ap

acitors.

REPLA

C

EME

NT

DATA

NATIONAL

AERO

VOX

CENTRA

LAB

COR

NE

LL

·

ERIE

MALLORY

PART

No. P

ART

No. PA

RT

No.

DUBILI

ER

PART

No.

PART

No.

PART

No.

H32S-2

AFH3-36

C027

FP376.5

E33B-4 PRS50/25 BR255 TC36

J665-44

1479-00025 5R5T25 MCB240

K946-2 BPO-OI

00-103

TM5S1

8U-0I

OC-5U

K946-2 BPO-OI

00-103

TMSSI 8U-OI OC-511

K946-2 BPO-OI

00-103

TM5S1

8U-0I

DC-5U

J665-S7

J665-44

1479-0002S SRST2S MCB240

J665-SS

J665-70

1464-001 IRSDl MCE2SI

J666-30 1464-003 1R503 MCE461

J66S-

71

1464-001 IRSDl MCE2S1

K946-2. BPO-OI

00-103

TM5S1 6U-OI

OC

-5U

K946-2 .BPO-OI

00-103

TMSSI

8U-0I

OC-SU

K946-2

BP

O-OI

00-103

TMSSI

8U-0I

OC-SU

K946-2 BPO-OI

00-103

TMSSI 6U-OI

OC-

5U

K946-2 BPO-OI

00-103

TMSSI 6U-OI

OC-

SU

K946-2

BP

O-

OI

00-103

TM5S1 8U-OI

OC-SU

K946-2

BP

O-OI

00-103

TM5S1

8U-0I

OC-SU

K946-2 BPO-OI

00-103

TM5S1

6U-OI

OC-5U

K946-2 BPO-

OI

00-103

TM5S1

8U-OI

OC-5U

K946-2 BPO-

OI

00

-

103

TMSSI 8ll-01 OC-511

Q963-19 P488-01

06-103

PTE4S1 GP2-333-103

PT4U

K946-2 BPO-OI

00-103

TM5S1 8U-0I

OC-5U

Q693-19 P488-01

06

-

103

PTE4S1

GP2-

333-103

PT4U

08250-44

7

S127

08-270

GPLK

-270 UC-5427

J665-47

1479-00025 5R5T25 MCB240

J665-44

1479-00025 5R5T25 MCB240

Q693-19

P488-0I

06-103

PTE4S1 GP2-333-103

PT4U

J665-47

1479-0002S 5R5T25 MCB240

K946-2 BPO-OI 0 0 -

103

TM5S1 8U-OI

OC-5U

~"R983-1

~

'PA-1l2

-2

~

'PC-71

I 1

'1406-02

K948-2 BPO-OI

00-103

TM5S1 8U-OI

OC

-5U

Q893-28

P488

-

04

7

OF-S03

PTE4S47

PT4147

Q893-34 P488-1

PTE4PI

PT401

Q693-28

P488-047

PTE4S47

PT4147

, Items C32A,

C32B,

C32 C and R32A, R32B

are

combine

d

In

one unit.

When

replacing

Items

separalely

C32B and C32C

should

total

250

MMF.

SP

RAGUE

PA

RT

No.

TVL-37BO

TVA-1306

SHK-SI

5HK-SI

SHK-SI

MS-21

MS-23

MS-31

SHK-SI

SHK

-

SI

5HK-SI

SHK-SI

5HK-SI

SHK-SI

5HK-SI

SHK

-SI

5HK

-SI

4TM-SI

5HK-81

4TM-SI

5GA-Q27

4TM-SI

5HK-SI

'104C5

5HK-SI

4TM-847

4TM-PI

4TM-S47

NOTES

-

'"

»

><

.......

CHASSIS-

TOP

VIEW

t

III

CO

PARTS

LIST

AND

DESCRIPTIONS (Continued)

CONTROLS

REPLACEMENT

DATA

ITEM

RATING

NATIONAL

IRC

ClAROSTAT

CENTRALAB

MALLORY

INSTALLATION

NOTES

No.

RESIST·

WATTS

PART

No.

PART

No.

PART

No.

PART

No.

PART

No.

ANCE

RIA 500Kn L K347-1 Ql3-133 AG-60-Z-

B-60-S

U-48 Volume

.

B

Shaft

Not Req. Not Req.

RS-2

Not Req. Not,Req.

Attach

tc RIA

C Switch Not

Req.

76-1

SWB

Not Req. US-26

Attach

tc RIA

R2A

1500n i K915-16 Qll-110

AG-ll-S

B-6

U-6

Pitch

B

Shaft

Not Req. Not Req.

FS-3

Not

Req. Not Req.

Attach

to R2A

R3A

LOKn

2 K349-3

A43-LOK

RlO,OOOL

Sensitivity

(Wire wound)

B

Shaft

Not Reo.

FS-3

DS36

Attach

tc R3A

RESISTORS

REPLACEMENT

DATA

ITEM

RATING

NATIONAL

IRC

NOTES

No.

OHMS

WATT

PART

No.

PART

No.

REPLACEMENT

DATA

ITEM

RATING

NATIONAL

IRC

No.

NOTES

OHMS

WATT

PART

No.

PART

No.

'R4

470Kn >

J569-57

BTS-470K

R5

68n

J J569-11

BTS-68

R6 47Kn f

J569-45

BTS-47K

R7

68n

J569-11

BTS-68

R8

2200n

J569-29

BTS-2200

R9 15Kn I J571-39 BTA-15K

RIO

33n

t

J569-7

BTS-33

Rll

220n

J569-17

BTS-220

Rl2 150Kn f J569-51 BTS-150K

Rl3

220n

f J569-17 BTS-220

Rl4 270Kn

J569-54

BTS-270K

Rl5

2200n

J569-29

BTS-2200

Rl6

100Kn I

J569-49

BTS-IOOK

Rl7

680n

J569-23

BTS-680

RlS

lOOKn

J569-49

BTS-IOOK

Rl9

2200n

J569-29

BTS-2200

R20 270Kn

J569-54

BTS-270K

R21

270Kn

J569-54

BTS-270K

R22 IMeg I J569-61

BTS-IMeg

R23 IMeg 1569-61

BTS-I

Meg

R24

2.2Meg

J569-65

BTS-2.

ZMeg

R25 150n t J569-15 BTS-150

R26

47Kn

2

J569-45

BTS-47K

R27 15Kn I 1571-39 BTA-15K

R28

LOOKn

!

J569-49

BTS-IOOK

R29

47Kn

I J571-45 BTA-47K

R30 10Meg t

1569-73

BTS-LOMeg

R31

470Kn H569-57 BTS-470K

R32J

250Kn f } • R9S3-1

B 500Kn

..

R33

270n

I J571-IS BTA-270

R34

22n

I J571-5

R35 100Kn I J571-49

BTA-LOOK

R36 150Kn 1 J569-51 BTS-150K

R37

6800n

J569-35

BTS-6S00

R3S

2.2Meg

1569-65

BTS-2.2Meg

R39

2000n

10

M707-2

13/4A-2000

R40

4700n

2

J572-33

BTB-4700

R41

4700n

t

J569-33

BTS-4700

R42

LOn

i J569-1

BTS-LO

R43

Ion

..

J569-1

BTS-LO

* Items R32A, R32B, C32A, C32B, C32C

are

combined

in

one unit.

TRANSFORMER

(POWER)

REPLACEMENT

DATA

ITEM

RATING

NATIONAL

STANCOR

MERIT

Halldorsor,t

TRIAD

No.

PART

No

.

PART

No.

PART

No.

PART

No.

PART

No.

PRI.

SEC.

1 .

SEC.

2

SEC

TI

1t1

7VAC I620VCT:l

Gi)5VAC16.3VAC

K-316-2 PC-S408<2}@

P-3151<2}

@

P9304(2)@

R-9A®

@

• 56A .064ADC

'2A

Gil

2.

6A

K-316-5

(i)

cD

A

ternate

pOwer

~.

®

Drm

new mounting' holes.

@

Tape

center

tap

on

6.

3V

winding.

TRANSFORMER

(AUDlO

OUTPUT)

REPLACEMENT

DATA

ITEM

RATING

NOTES

NATIONAL

STANCOR

MERIT

Halldorson

TRIAD

No.

IMPEDANCE

DC

RES.

PART

No.

PART

No.

PART

No.

PART

No.

PART

No.

PRI.

SEC.

PRI.

SEC.

T2

4.

6Kn

la.In

I

295n

I

.56n

K313-3

A-3877

A-2930 Zll07

S-3X

CD

Drill

one new mtg.

hole.

PARTS

LIST

AND

DESCRIPTIONS (Continued)

COILS

(RF-IF)

REPLACEMENT

DATA

ITEM

USE

DC

RES.

NATIONAL

MEISSNER

MERIT

MILLER

No.

NOTES

PRI.

SEC.

PART

No.

PART

No.

PART

No.

PART

No.

LLA

Ant.

Coil

30n

2.Sn

Band

"A",

540-1600KC

B

Ant.

Coil

.9n

.sn

SB:1517 Band

"B",

1.6-4.7MC

C

Ant.

Coil

.9n

on

Band

"C",

4.7-14MC

L2

Ant.

COil

.10

on

SB:1519 Band

"D",

14-40MC

L3A

RF

Coil

30n

2.Sn

Band

"A"

B

RF

Coil

.9n

.sn

SB:15IS Band

"B"

C

RF

Coil

.9n

.10

Band

lie"

L4

RF

Coil

on

SB:1520 Band

"D"

L5

Osc.Coil

10

1.5n

SB:1573-1 14-1060 BC-3S1

71-0sc.

Band

"A"

L6

Osc.

Coil

.sn

1.20

SB:1574-1 Band "B"

L7

Osc.

Coil

.In

.In SB:1575-1 . Band

"C"

LS

Osc.

Coil

.In

on

SB:1576-1 Band

"D"

L9

1st.IF

Trans.

20n 20n

Q242-2 16-5740

BC-339

912-C2

LI0 2nd.1F Trans

20n

Q242-2 16-5742

BC-339

912-C2

Lll

3rd.IF

Trans

Isn

Q242-1 16-6770 •

BC-376

12-C6

Inclndes

47Kn

resistor

L12

BFO

Coil

6n

SA:5361

and

diode

load

filters

•Cut out

chassis

metal StrlP, use adaptor plate

and

add

47KO

resistor

externally.

Tapped

Gil

4.

an

ITEM

PART

NAME

No.

M!

Dial

light

M2

Tuner

M3

Tuner

M4

Switch

M5

Switch

M6

Switch

TrJmmer cap

Trimmer cap

Knob

o

MISCELLANEOUS

NATIONAL

PART

No.

FI36-11

P705-2

P706-2

E230-2

S245-1

L209-2

S662-1

DS32-5

E3U-2

E311-1

A: 5292-2

SA:9305

NOTES

*47

bayonet

General

coverage

(3

sections

at

13-454MMF each)

Bandspread

(3

sections

at

LO-37MMF each)

Stand

by-receive

(toggle-SPST)

Band

selector

(3)

ANL-oIf, tone

Hl-L),

AM-CW

(slide

SPDT)

Antenna-air

variable

(5-50MMF)

RF

-mica

(4)

used

(2.

2-40MMF)

Osc-ceramlc

(2)

used

(5-20MMF)

Osc-ceramic

(2)

used

(2. 5-6MMF)

Large

(3)

used-·antenna, main

and

band

spread tuning

Small

(4)

u;:;ed-sensitivity,

band

select,

pitch, volume

a

TUNING

GANG

fULLY

CLOSED

TUNING

GANG

FULLY

OPEN o

National Company NC-88 User manual

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