Ampex 300 Owner's manual

SUPPLEMENT

FOR

CCIR*

EQUALIZATION

STANDARDS

MODELS

300.

351.

AND

352

~

AMPeX

AMpIEX

PROFeSSIONAL

PRODUCTS

~

COMPANY

JANUARY

1960

TM2006

*

INTERNATIONAL

RADIO

CONSULTATIVE

COMMITTEE

FOREWORD

This

manual

provides

supplementary

information

regarding

changes

and

additions to circuitry for CCIR equalization.

The

Ampex

equipment

affected by these

changes

are

the

Models 351 single

chan-

nel, 351-2 two

channel,

300 single

channel,

300

multichannel,

am!

352 single

channel.

CCIR equalization is available only

in

the

7112

and

15

inch

per

second (ips) tape speeds.

In

each

of the three sections

of

this

manual

are

part

numbers

and

description of

components

which

are

used

to

obtain

CCIR equal-

ization

curves. All other

standard

part

numbers

are listed

in

the opera-

tion

and

maintenance

manuals

for

the

applicable model. Curves

and

schematics

for the CCIR configuration

of

the

various models

appear

throughout

this

manual.

1

2

3

4

351

AND

351-2

CCIR

EQUALIZATION

MODEL

351

ELECTRONIC

ASSEMBLY

VARIATIONS

IN

CIRCUITRY

FOR

CCIR

EQUALIZED

ELECTRONIC

ASSEMBLIES

FROM

THE

STANDARD

NAB

EQUALIZATION

CHANGES

AND

ADDITIONS

MODEL

351

CCIR

PARTS

LIST

PARTS

LOCATION

RECORD

AMPLIFIER

AND

BIAS

AND

ERASE

OSCILLATOR

FIG. 1

PARTS

LOCATION

REPRODUCE

AMPLIFIER-FIG.

lA

SCHEMATIC

DIAGRAM

MODEL

351

CCIR

EQUALIZATION

(FOLDOUT

SHEET)

D-30961G

352

CCIR

EQUALIZATION

MODEL

352

ELECTRONIC

VARIATIONS

IN

CIRCUITRY

FOR

CCIR

EQUALIZED

ELECTRONIC

ASSEMBLIES

FROM

STANDARD

NAB

EQUALIZATION

352

CCIR

PARTS

LIST

ELECTRONIC

ASSEMBLY

SCHEMATIC

DIAGRAM

MODEL

352

CCIR

EQUALIZATION (FOLD

OUT

SHEET)

ED-3009S-10SE

SINGLE

CHANNEL

AND

MULTICHANNEL

300

SERIES

CC1R

EQUALIZATION

MODEL

300

MULTICHANNEL

EQUIPMENT

VARIATIONS

IN

CIRCUITRY

FOR

CCIR

ELECTRONIC

ASSEMBLIES

FROM

STANDARD

NAB

EQUALIZATION

300

CCIR

PARTS

LIST

ELECTRONIC

ASSEMBLY

MODEL

300

ELECTRONIC

ASSEMBLY (MONAURALl

VARIATIONS

IN

CIRCUITRY

FOR

CCIR

EQUALIZED

ELECTRONIC

ASSEMBLIES

FROM

STANDARD

NAB

EQUALIZATION

300

CCIR

PARTS

LIST

ELECTRONIC

ASSEMBLY

SCHEMATIC

DIAGRAM

MODEL

300

(MU

LTlCHANNELl

CCIR

EQUALIZATION

(FOLDOUT

SHEET)

D-31537

A

SCHEMATIC

DIAGRAM

MODEL

300

(MONAURALl

CCIR

EQUALIZATION

REPRODUCE

AMPLIFIER

ED-498-105

SCHEMATIC

DIAGRAM

MODEL

300

(MONAURALl

CCIR

EQUALIZATION

RECORD

AMPLIFIER

AND

POWER

SUPPLY

ED-499-105

CCIR

EQUALIZATION

CURVES

RECORD

AMPLIFIER

RESPONSE

(CCIR)

100

~

SEC.

7~

INCHES

PER

SECOND

RECORD

AMPLIFIER

RESPONSE

(CCIR)

35

~

SEC. 15

INCHES

PER

SECOND

REPRODUCE

AMPLIFIER

RESPONSE

(CCIR)

7~

AND

15

INCHES

PER

SECOND

1-1

1-2

1-3

2-1

3-1

3-2

TABLE

OF

CONTENTS

Section

1

351

and

351-2

CCIR

Equalization

MODEL

351

ELECTRONIC ASSEMBLY

VARIATIONS IN

CIRCUITRY

fOR

CCIR

EQUALIZED elECTRONIC

ASSEMBLIES

FROM

THE

STANDARD

NAB

EQUALIZATION.

RECORD

BOARD-

1.

An

additional equalization circuit comprised

of

a 20 millihenry choke

(ILl);

.0024 micro-

farad

capacitor (1C

11

),

is wired across 1R22

through

contacts

of

switch

4S2B as shown

on

schematic

diagram

30961.

2.

1C8 is

changed

to a .068

microfarad

capacitor.

3.

1C46

and

1C7 are both

changed

to 275-970

microfarad

adjustable capacitors.

For

the

location

of

these

components

see

Figure

1

of

this section.

REPRODUCE

BOARD-

1.

Capacitor 2C15 is

changed

to .0012

microfarad

and

the

jumper

between

2R30

and

2R31,

is removed. Variable resistor 2R30

(500K)

is utilized for CCIR equalization.

Ref.

No.

1C7

1C8

1C11

2C15

1C46

ILl

2R30

For

the

location

of

these components see

Figure

1A.

CHANGES

AND

ADDITIONS

MODEL

351

COR

PARTS

LIST

ELECTRONIC ASSEMBLY

CATALOG NUMBER 30960-05

AND

-06

Part Description

Capacitor, variable: 275-970 pF, 175 V dcw: El Menco

Part

No. 306 Type 30

Capacitor,

paper:

tubular, .068

uF,

10%,

400 V dcw: Sprague

Part

No. 89 P 68394

Capacitor,

paper:

.0027

uF,

5%,400

V dcw: Sprague

Part

No. 89 P 27255

Capacitor,

paper:

tubular,

.0012 uF, 400 V dcw,

5%:

Sprague

Part

No. 109 P 12254

Same

as 1C7

Choke, air core: 20 MH

Resistor, variable: .5

meg

ohm,

30%,

%

W:

Chicago

Telephone

Supply

Part

No. Type UPE-70, Spec. 31184

Reproduce Board Assembly

Record Board Assembly

Harness

Assembly

(Master)

Harness

Assembly

(Slave)

1-1

Ampex

Catalog No.

038-003

035-299

035-298

034-203

038-003

30767-01

044-207

30962-04

30963-04

30966-01

30966-02

4S2

(GND}------------,

r------------------~MODEL3000NLY)

4S2----------~

,------------{

MODEL

300

ONLY)

~~;:-I

~-~-LA=T=IO=N=S=========A=--,

1

jr-lr--

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-

__

3:~::

YW

06KBL

.....

~

R/w.

GNBRGY

FIG.

1 G

1

.

rft

..

8

·.~

..

t~~l

..

~f

.~.t-.

~!

.

..

r.

tr

-'-1E-~?O

.

C(~~

...•.

J.

~

.....

/

.....

~

..•..

~f·~·!/

R61

---'Wv---

..

~

u f

Y.

4R9

(GND)

GN

..

---4S2

(GND)

Ii:

BL.

6TI

(GND)

Q)lw-----6T,

(TERM

3)

n

R6

~

CI

0::

1

V·

4S1

---1E-

R62

~

01

uT

R23

-'\NIr-

R65

.....-JVItv-

0-3C28

(12.6

DC-)

R

••

-------

3R57

C1l

:£

8R-3C28

(12.6DC+)

BK--GND

(PWR

SUPPLY)

:::_SS_'_S_G_N_D==========~:!_K--,rr

Bl'-R

____

l~=Br~L--=~--=~--=~--=~--=~--=~--=~--=~--=~--=~--=~-

__

5=J=2=(_T-E-R-5::~

4S3---------------------'

PARTS

LOCATION

RECORD

AMPLIFIER

AND

BIAS

AND

ERASE OSCILLATOR

1-2

LEGEND

•

THE FIRST NUMBERS SIGNIFY THE

LOCATION

I.

RECORD

AMPLIFIER

BOARD

2.

REPRODUCE

AMPLIFIER

BOARD

3.

POWER

SUPPLY BOARD

FIG.

lA

4.

FRONT PANEL

OF

AMP. CHASSIS

5.

BACK PANEL

OF

AMP.

CHASSIS

6.

SIDES

AND BOTTOM

.••...•

C15)1 .

../.

. 'I/Vv R2B

·.R29

.>.

'.

:~~~

:.

~N

~~

..

~

L~w~

~1

4S2C

oBR

°T

.

.R30

~.

f

4S2C

OR'

~

4R36

(GND)

.O/f···

....

t

N~

~2

~l~f:rt')~·

~~~

(GND) :

..

~/Y~

..

~'.~

T

~l

T~

~~

..

~~44

6T3

.R/YN·

~

.' ¢

,......--

3CI6D

0Y....

a::

GND

(PWR. SUPPlY}-4tGY

~

.l~f~f

..~

4S3A

0 Y

10

a::

0:

J...,

.

....

:..:r

0:<.\11

<D

.

o¢

0:

R34

~

BL.

4J3

(TERM

B)

R.

4J3

(TERM

C)

GN---3C2B

(12.6 DC-)

BK---3C28

((2.6

DC+)

W.

3CI6A

O.

3CI6B

Bl·

6T3

BR·

6T3

V·

6T4

(AC

Fll)

GY.

6T4

(AC

FlU

PARTS

LOCATION

REPRODUCE AMPLIFIER

1-3

SCHEMATIC

DIAGRAM

ELECTRON IC

ASSEMBLY

MODEL

351

45·1

I

V-Ih

INPUT

TRANSFER

S\V1TCH

MJCROPHONErQ~

______________

~I~'A~X~1~/~E~C~C~'3~~

CCIR

EQUALIZATION

BALANCED

I

~b----------------------------~~

BRIDGE:

·6

~------~I

SJ-l

'"

-7".

UNBALANCED

I

#.

LINE

('I~~)

I I

"lOOK

I

I~

15

L-.-l

' 1

r...l:,

IV-I;:!

12AX7!ECCf<:j

1

v-2b

12AT7

IV-2a

IR-19

Q

12A'J'7

22

K

IW;;:::,)

IR-23

8200

CATALOG

NUMBER

0-30961

G

1

lc-wl

5C-IJ

30960

4 I I

'4R-l

>-

BRlDGE

\rj'

r-~,\

,'o~-~;'

IC-I"

O

INPUT

F-,L;-

V'n-~\

-+--}----1Ir-+-...,

I B

.T-~3

.~-n-·

-74.S

~~-~L

r--"{fi

'n'

Kt,

'R-'~-)'"

',RO-O'

~~-:

L-+--<l:'

•.

2;~0

>-

.'1

T

J:i2BToAl

15

-130pF

L-_~~~~~~

__

-._~"U5~~V~.

___

..

_______

__

R:~~RD

~

I

1i:]ST

3~3WI

T

NOTES.

\.

RESISTOR

VALUES

ARE

IN

OHMS

1O'b

In

WATT

UNLESS

OTHERWISE

SPECrF'l:ED.

2.

ALL

CAPACJTOR5ARE

IN

.MlCRO~

FARADS

AND

RATED

AT

400

v.

UNLESS

OTHERWISE

SPECl

fI

E

d.

3, S\.Vl'TCHES

ARE

SHOWN AS

THEY

fUNCTION

NOT

AS

THEY

ARE

CON-

STRUCTED

AND

WIRED.

4.

FOR

UNBALANCE?D

OUTPUT

WITH

ONE

SOE

GROUhUED

CONNECT

A

TO

BAT

51'52

OR,P1N

1

TO

PTN

2

AT

5J5.

FOR

BALANCED

OUTPUT

WITH

CENTER

T,A.P

GROUNDED

CONNECT

G

TO

H

AT

61'81.

5,

JUMPEREDAS

SHOWN,

VU

METE:R

IS

CAUBRATED

FOR

+ B VU

OUTPUT

FOR

+ 4

YU

OUTPUT

JUMP

E

TO

r'

INS'TEAD

Of'

E

TO

0 ON'

6TS3

(SEE

INSTALLATION).

READJUST

RECORD.

CAW8RATTON

CONTROL

AS

DESCRlSEO

IN

SECTION

V

OF

MAJNTENANCE

MANUAL.

6

D,C,

VOLTAGES

MEASURED

WITH

20,000

OHM

PER

VOLT

METER

WITH

EQUI

PMEN'l'

1N

'RECORD

MODE

AT

It7V,LJNE.

~GNA

L.VOL

'rAGES

MEASURED

WI

TH

AC

VTVM

AND

EXPRESSED

IN

db

REFERRED.TO

.76

VOLTS.

crRCUlT

CONDITIONS

5J-7

2R-25

330

I<

'rAPE

TRANSPORT

INTERLOCK

4

.,

2

'R

3

.>

'----0-'

l'li

IR-'

4R-9<

100

>

~

I MEG

100

K<

2R-ZIl

1!500

1'(,

4R-36

250 K

~S-3a

I

12R-31

II

MEG.

I

4CR-2

PLAYBACK

I

__

~~~

____

,

LEVEL

I

HEAD)~

\

~---------------------------

45-28

CCIR

EQUAL.

ONLY

2 40

(SEE

TABLE

I)

~

2R

47

lC

22

R-

2V-4a

2V~4b

15-

K

.1

50V

5J-4

82

K

I2AX1!ECC83

12AX1!ECC83

295

Jo.AA

J

f-vMONITOR

~o~

".I~

""

'j':'"

r

C'

J!.

\"'~

50g

2

V'"

220

K

,0'

~

~lROWN

6T

il

-;C

3

-<>-Y:..:E::L::L::.O:..:W,

________

....

-.:-

____

.......

..-_

.....

."..""i-_____

...

V"":.r.._-

__

~~,

~

::0,:

:R'-4.

~\

6_:,

BLACK

T~~~~

~_;

'4h'3

)51

2{

- \

90

.02 8 -

UNE

2 n r

\"

~~:

,

.....

_+_5-100I-V~

......

-+

__

'1M

13

~

GREEN"

5R56~8

>-

OUTPUT

I

0i

-

~--

-

4=

h~,

-~

-:

j'

RED/YEL.

~61TSH-1

:l-5T&-B

2

7TJ'rrr

~~o7i

0-:e

~.

'¥@

BLUEbD~R<EEN/YEL'

"

2

..

'

~

2H-39

2H-41

2C-20

2R-45 2R-46

295 •

18

2R-49<>

1~00

> I MEG. 1!500

1l;'6~FV'T'

MEG 1000

~

39

K > SEE

NOTE'

,

____________

~=..::.:::-':___j--__,

I

BIAS"

-L

~

~'

2

/[L-~-8

LOy

16ll-s"g'

~

: !

~

---- --

~

------

r---------------~----------------------------------------------...J

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

~~03~~4:08

-

~~~=~7

-

~}~E

--

4S-~

4K-3

I

lV-6

T1777T

COU?LlNG

II/If

;

flM-1

SPARE

5 POWER.

BIAS

COUPLING

RL_AY I

12AU7

L---f-----

..........

, V U

~,E,C~.

A.C. :

~~r2-,

...

1---5c-.-2-5t-t--f-J

'-_t-

____

.....

..,.~"'rr141~:

....

~_~..Ja

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

-JB-:;~1,~.~r----,,-:;-:--:-:-~---

....

-~-::

1",,:~

-----

--;

- - - - -

:,:~,~~

--~

- - - - - -

~,-roJ""

.~

""

,::~.!

j

!M~·

REC.

111

v.

A.C·

I

-'

6~~~16gf\

f-:'

l.s_6:

~'i"i.c;,,~D

6T-"EL.

!~-:

330

I,~~O

I~~O

31~

~

3'5~-3;

I

,;~.

~

330

fX

Ic?8is

3

s

3

0 I

PLAYBACK

H?~

I A .A';" I

I'!

~

,00\'"

6

,....2T-S

X

pF

lanK

AND

OUTPUT

lei?

7

.1

I~EL3

4 7 'YO

__

~',2500V-T-5%5

'R

OOV

·l

7!\/:~__

x 1 SWI"PCH

L-'"!0L-.

BI..AyCK

3C

2 t

__

,

r-.

5C-34

-,,-

J

RE~

,t"J.

"~O~"I

3C

I.

+ 3 +

f;-"

4

'

700

R-

61

'>

~R700-62<

B

1I'--~7.,..-----.....;;5:.·.~::..,o-'g:.:::g:.:::6:!V-----------------....l

~

45~OV'

T.J

-

~i1:d:'T-

-,

,

~~",~""'..J

1

lR-"

POWER

CIRCUIT

f'OR

309:0E~g3RD-~~'f"T'°68

RED/YEL.

1,Ro-6K3~r

8A""'LA

1S

N

E

C'

E

~,%w2

~41-1

RECORD

(SLAVE

EU:CTRON1CS)

-

t-':a-.;...;.;;.;..--t--

...

--+---t---.,.-

..

---

..

-

....

-

__

~:.;.~

..

I.::::.:;::,;::;.::O-_--I-----..!.::~~~+D

UGHT

,...-<J\.

'R-56

3C-29

lC-2c

T_

-T

.

SF'~:;Z

1/2

A

5;L~

BLO

100 ,01 10

-..J.:"

-:!:-

lR-65

5./-7

311

Y Z RF.D

..;..

__

....

__

'0.t,00"

V.

450

VT+

-=

220 K

TAPE

TRANSPORT

r

I~

~~~R

WHITE

I:

3R-51

II~O~

INTERLOCK

6

~~

5J-B

~~I~~3cl

__

A·~10~0~-1~2A1wY-';~-;~

______________________

-4'--

____

~~~~

__________

~

_________________________

J

A.C.

IN

~

3K-IoI

>::-?

Y'

REC.

4

I--~

-~

1Z

K-Ic

.o{c;~go

v.

6'"

TABLE

1

I

~

7 LEGE),iU

r-_r-N_A.;:8_E;..Q:.U;..A...;U:.:ZA;;.T:.':;:O;;.~:....

__

.,

9

'5

4 THE: FlRS'J'

NUMBER

Or"THE

SCHE.MATIC

REFERENCE

MACHINES

NUMBER

3GNIF'lES'f'HE

LOCATION

REF

3-3/4

-1-1/2

7-1/2

-

15

GREE:N'

SPARE

5 ,

NO,

J096O..o2,

-04

30960..o"

..o3

r--------+-o-L++-4--1

________

-+-4~~

__

---ff,3K-la

8QUAIJZA1'rON

SWJ'J'CH

482

IN

?~1/2

REe.

.:I I

?CanON

500

CYCLE

INPUT.

~

GREEN

YEL.

'5:=>

I

RECORD

AMPLlnER

BOARD

LEVELCONTROLS-4R9A.ND1R36

rULL

II'1V.

~.C.

2

~

CLOCK.WlSE.

UHf:

OUTPUT

5J5TER-

5C-2S

I

.MlNATED

IN

NOMlNAL

600

OHMS.

OSClL-

111

II.

A.C.

I

~

.0047

I.. r

RrCORD

LATOR

TUBr.1

V6

REMOVED.

'-

______

-L---l

SC

24

600

~-6

I

RELAY

I,OOOOHMRE:SlSfORSUBS1T1'U'l'EDfUR

.OO-47~-IV'

j

~_~

:

3K-l

l~EpCUOTR~RHA~"s~·ER.

SWITCH

451

IN

MICR,O-

fiOO·Y.,

r-

L56r~-~'v.

r

PHONE

POSlTlON_

•

RECORD

RE.LAY

.31(1

ENERGIZED.

NOTE:

UNBALANCE.

OF

2

db

MAY

BE

EXPECTED

AT

2

AND

1

Of'

2VS.

RECORD

BUTT()"""

POWER

CIRCUIT

rOR

30960-01

-02

-

07

MA5TE:R

ELE.CTRONlCS)

~GREEN~

e4 5

~

BLUE"'1_2

4~:_60

BLUE:

1.S

2V-3

!v-2

lV-1

YEL.

J..

lW

A

12AX7

12Al'~

12AX7

8LUE

L

__

V

::._-'J;

.....

'

.......

+

_~.:.._4

....

9=--~=9

____

47~DC2.6

6CR-l

4000---r--

15

Y. r

5

2. RE".PRODUCE

AMPUF'lER

BOARD

3

POWER

SUPPLY

BOARD

4

fRONT

PANeL

OF

AMPLJFlER

CHAss.S

5.

BACK

PANEL

or

AMPUflER

O{A~SlS

6.

SlOES

AND

BOTTOM

OF

AMPUflEA

CHASSIS

..L

mh,-

O

D

CIRCUIT

GROUND

CHASSIS GROUND

o c

VOLTAGES

SGNAL

\l.OL

'fACES

R-·30

SOOK

OMIT

-BYPASS

S-2C

AS

SHOWN

WITH

DOTTED

~-4

________

~

__

~u~m~~

Section

2

352

CCIR

Equalization

MODEL

352

ELECTRONIC

ASSEMBLY

VARIATIONS IN CIRCUITRY

FOR

CCIR

EQUALIZED elECTRONIC

ASSEMBLIES

FROM STANDARD

NAB

EQUALIZATION.

REPRODUCE

AMPlIFIER-

1.

The

Plugbutton

marked

"120-200 microsecond" was removed

and

replaced with a 100 K

variable resistor

(RI07).

2.

Relay K101 was

mounted

in

the electronic chassis. (See Note 5 on

Schematic

30095-105.)

3.

A .20

microfarad

capacitor was

connected

across

the

KI0l

relay.

4.

A 47

ohm

resistor

(RI28)

and

a rectifier

(SR102)

was connected

in

series

with

#3

and

#6

of

the

]104S.

5.

Capacitor C102 was

changed

from

.006

microfarad

to .0082 microfarad.

Ref. No.

CI02

C115

SR102

KI0l

RI07

R128

352

CCIR

PARTS

LIST

ELECTRONIC

ASSEMBLY

CATALOG

NUMBER

30512

Part

Description

Capacitor,

mica:

.0082 mfd., 500 V dcw, 1% : Elmenco

Part

No. CM40C822F

Capacitor, electrolytic: 30 mfd., 350 V dcw,

-10

+100%:

Sprague

Part

No.

Type

DEE

Rectifier, Silicon: 6 amp. DC

max.

out, 400

VAC

rms

max. out:

Texas

Inst.

Part

No. IN2070

Relay,

3P

DT:

80 to 140 VDC,

contacts

should switch 1.5

amps

at

115

VAC

or

28VDC.

Resistor, variable:

.1

meg ohm, % W, 20% :

Centralab

Part

No. Model 2

(TPR

C2).

Resistor, fixed: carbon, axial, 47

ohms,

1/2

W,

10%:

MIL-R-11:

RC20GF470K

2 -1

Ampex

Catalog No.

034-087

031-048

582-036

5760-00

044-038

041-034

+

155V

RID5

VIOl

330K

RI09

>,

MEG

jO/o

RIIO

150

K

IW

el05

RII2

>'!"EG

+

235V

>

~"3

330K

TIOI

SCHEMATIC

DIAGRAM

ELECTRONIC

ASSEMBLY

MODEL

352

CCIR

EQUALIZATION

CATALOG

NUMBER

30512

ED

30095-105

E

--">-ll

fj.OI

+55iy

+

55V

. . 8

VI02

Rill

»_+_+~_6-}4\-

=~J7

12SJ7

1%

J,W

ISELEO.!)

....

+-"-25"'V'-

_____

+

~

~~~K

,.~

+,'lsv

JIOtP

A

PLAYBACK

•

HEAD

C

B ? 1% IW 4=:';:")6 +

CI03

2

TP--

5

tl,2V

_~~~~OV

I MEG, > 5 t j

r-

INPUT - H

~

SE.t:NOTl.

,,

__

KID'

'-6J7()'

~

RID2

2.2K

10

/"

:::-

,CI02

.Ofr..

.01)"

~5E£NOT£b

v U RIDG

2200

+

0·104

;:'-'50'

-

25V

RIDS

lOOK

15l~~

0

PLAYBACK

EQUALIZER

~A

'0

P/8

GAIN

-'J

RI07

lOOK

BLACK

JI03P

AC

POWER

IN

JI04

S

MECHANICAL

AS$EMBLY

I.

ALL

RESISTORS;

IN

OHMS

AND

R,(t.:rED

~

W,

10%

UNLESS

OTHERWISE

SPECIFIED.

2.

ALL

CAPACITORS

~ATF.O

IN

.MICROFARAOS.

3·

ALL,

VOLTA~E~

MBASURED

WITH

20.000

U"",5/

VOLT

ME'TER,

WIT.H

1!5V

AC

LINE,

AND

AMPLIFIER

CONNECr£D

TO'TAPE

TRANSPORT.

4.

TRANSFORMER

VOl.'rAGE AT PIN

NO.5

OF

JI06S

MUST

BE

IN

Pl'ASE

WITH

VOlTAG6

Al

PI,"!

NO.3

OF

UW65.

5,

MOUNT

KIDI

ON

T,HE

S,

IDI,

PAN,£\.

BEl'"iiIi',

, N

RIO,B

,AND

TIDI,

cONtACTS

::\11)1:>

FAG,lN",'TOWARD.5

',;rIal

P j>.'Nn

~'QL£NOiO

FACH/G

OUTPUT

TRAN,S l"fER. 1'101.

6,ti,YIST'.TfiE

WIR~S

,(ND

RUN

n~(;M

A~AINStTH.t51DE

OF

THE

,CHAA6J~_

o

+~-

'71

CI07

25

25v

C1

O;'-r;;-;::~--'<\-/vV'v4>-"+'-'"

L£'£V,..

4

+2.5V

.50V

r~-:

-

2~

:~gv

L

jt~,=J

TtOZ GRtEN

Jc:>.

YELlQW

!FGRq:N

I'--"''''f'''-f--.,..

x

REt{

RII5

220

RI22

"

RII7

>

5:0K

CliO

25

25V

Z\7

IW

-12.6~

---L~Jl3

·

.....

u

+I

2000

J5V ,

"v

RII8 >

1500

,R1I9

~150K

+

325v

e

~425V

+',39SV

,".at

e

6'

R123;

IR\{41'RJ25

V;{,26

v-

ts::

VI04

8 '

3.3K

8200

C:::,ro

5W

2W

JI06S

=R"p

5Y3GT 2

~5PARE

' 8

I§-YEL

ow

r::

- - - -

-~ttlCII4

Io-,L

4 I

-no

"'30

30l)

475v

SIGNAL

7

)0

~-+_--I~

6

I,-O~R~E~D~-r

__________

*-

____

~

______

~(~S~E~E~N~0~T~E~4~)

______

L

________

-t

_______

~

______________

~

__

~~

5

Y

....

-+--1~

4

BROWN

x

~3

U

-12V

DC

2

,i;"RNil I

-

AUTOMATIC

CONTROL UNJT

1- - - -

--

- - - - -

--

-,

I 1 2 3 4

l

£l

[DJ

J201

q

10'~

L~='s'

COiJTROL

STRIP

REF.

C -

,OGI

I

.-J

Section

3

Single

Channel

and

Multichannel

300

Series

CCIR

Equalization

MODEL 300 MULTICHANNEL EQUIPMENT

VARIATIONS IN

CIRCUITRY

FOR

CCIR

ELECTRONIC

ASSEMBLIES

FROM

STANDARD

NAB

EQUALIZATION.

1.

The

30920 EQUALIZER BRACKET ASSEMBLY is removed

and

the

30761-01 EQUALIZA-

TION

SWITCH is

installed

in

the

same

location.

RECORD

BOARD-

a.

An

additional

equalization

circuit

comprised

of

a 20

millihenry

choke

(ILl);

.0027 mic-

rofarad

capacitor

(lC11)

is wired

across

1R22

through

contacts

of

switch

4S2B as

shown

on

the

schematic

diagram

30961.

b.

Capacitor

1C8 is

changed

to a .068

microfarad

capacitor.

c.

1C46

and

1C7 are both

changed

to 275-970

microfarad

adjustable

capacitors.

For

the location

of

these

components

see

Figure

1

in

Section

1.

REPRODUCE

BOARD-

Ref.

No.

1C7

1C8

1C11

2C15

1C46

ILl

2R30

a.

Capacitor

2C15 is

changed

to .0012

microfarad.

Variable resistor 2R30

(500K)

is

mounted

on

the

etched

board,

replacing

4R69 formerly located

on

the

bracket

as-

semly. Variable resistor 2R31 (WOK)

is

installed

in

place of fixed

resistor

2R31 (68K).

For

the location

of

these

components

see

Figure

1A

of

Section

1.

CHANGES

AND

ADDITIONS

300 COR

PARTS

LIST

ELECTRONIC ASSEMBLY

CATOlOG

NUMBER

30960-07

AND

-08

Part Description

Capacitor, Variable: 275-970 pF, 175 V dcw: EI Menco

Part

No.

306

Type

30

Capacitor,

paper:

tubular,

.068 uF,

10%,

400 V dcw:

Sprague

Part

No. 89 P 68394

Capacitor,

paper:

tubular,

.0027

uF,

5%,400

V dcw:

Sprague

Part

No. 89 P 27255

Capacitor,

paper:

tubular,

.0012

uF,400

V dcw, 5% :

Sprague

Part

No. 109 P 12254

Same

as 1C7

Choke,

air

core: 20 MH

Resistor, variable:

.5

meg

ohm,

30%,

%

W:

Chicago

Telephone

Supply

Part

No. Type UPE-70, Spec. 31184

3 -1

Ampex

Catalog

No.

038-003

035-299

035-298

035-203

038-003

30767-01

044-207

2R31 Resistor,

variable:

100 K

ohm,

20%,

114

watt:

Chicago

Telephone

Supply

Part

No. UPE-70, Spec. 31186

Reproduce

Board

Assembly

Record Board Assembly

Harness

Assembly

MODEL

300

ELECTRONIC

ASSEMBLY

VARIATIONS IN CIRCUITRY

FOR

CCIR

EQUALIZED ElECTRONIC

ASSEMBLIES

FROM STANDARD

NAB

EQUALIZATION.

RECORD

AMPLIFIER-

044-204

30962-04

30963-04

30819-03

1.

An

additional

equalization

circuit

comprising

of a 20

millihenry

choke

(1L1)

and

a .0025

microfarad

capacitor

(C109)

was

mounted

on

the

terminal

board.

2.

Capacitor

C105 (.1

microfarad)

and

resistor

R107 (lOOK) were

removed

and

the

terminals

were

shorted

to ground.

REPRODUCE

AMPLIFIER-

1.

A 5K

pot

was

added

(R224).

One

terminal

was

connected

to

ground

and

the

other

terminal

connected

to a

normally

closed circuit

of

K102

(a

previously

unused

contact

set).

One

terminal

of L101

was

connected

to one

lead

of C109.

The

remaining

lead

of C109

was

connected

to

the

moving

contact

of K102.

The

normally

closed

contact

of this

contact

set

is

connected

to ground.

2.

Capacitor

C206

was

changed

to .068

microfarad.

C206

lead

(formerly

connected

to

R207)

now

connects

to a

moving

contact

of K102.

The

terminal

of R207

now

free,

was

connected

to a

normally

open

contact

of K102.

Ref.

No.

R224

C109

C206

L101

300

CCiR

PARTS

LIST

ELECTRONIC

ASSEMBLY

CATALOG

NUMBER

MOD. 559-00

Part Description

Resistor,

variable:

5K

ohms,

20%,

1/2

W:

Chicago

Telephone

supply:

Type

65

(TRP

D)

LT-2

Capacitor,

mica:

.0025

mfd.,

500V dcw,

5%

:

Elmenco

Part

No.

CM30B202M

Capacitor,

paper:

tubular, .068

mfd.,

400 V dcw,

10%:

Sprague

Part

No. 88P68394S4

Coil,

RF:

20 MA: Miller

Part

No. 691

3-2

Ampex

Catalog

No.

044-073

034-076

035-134

051-018

4S-1

INPUT

TRANsrER

s\IIITCH

1

V-Ib

BA

LANCE

0 \

'tr------------------------------,f--,

I

\r

-I"

220

I R-13

lv-2b

12AT7

~CROPHONE~t-

________________

12_A_X_'~/_Ee~C_'_3

__

~

sv

BRIDGE

0

12AX1/ECC8J

27

K

r-------O'

r---~~r--r----~----~~~~VV·A~--~t_1

UNBALANCED

I

FP

Ie

h

T+

5J-1

I'r

-

7\

BRIDGE

\rj:

D\

io~-~

le_I]10

'R·,O

10

~

IR-14

Ir?\

4,

".R.I

,

''11.

_

,10

.00

K Q

1:

'R

K

'-<

',~;91=o

.V."

'R·19

0

UNE(,i,~),:

•

'IOOK

> ,

r:--

H-

~

..-~

-=-

),~,

*~t---+-.-R-

.

..:lB

.....

------t.---

"AT'

22K

'W;.::::J,

'i'lPUT

~

,

't-----+--+--I-----o

'

~'

~~~l

§7,:

_'_

.e-.

J_'OO~

---;

12~'\,K

,):b...~

lCi;b~

0--

LJ

~~.~?,---o:

TU)'

~J

~

6.-·

:~~:3v,

>fY'

H~~-~)Q.,ov':.r:

-74.!

.--

{II

,IR

1

~\.:.J

0

02

1R-IS'"

IR-Ie

.rtfr

IC-_%~

I

...

]

II

7

'IRO'O'

2·

R

O'K·

~

'--+_-q,,' 6

,',

211,?O.

.-

'R-ll

~L'

MEG,,>.!::-:,rl~_0_0-1>---t-4>_+z-r-5---9-70__.

,-L,

>-

IR·ll_

.

<'

. "

-'!'~

,;

,

...

'C-B[~T'R.20

220'

ILl zolriH

....

t------+--<>

4

'ti'

.R

,

3300

'R-I'

~010'J'.

IR-17'

IC-7

-...y.

.~~

I

MEG.

4R-3

-4R-!J

47

K 0

(,YIR

22

100

~

I I

MEG

100

K'

2~0

K

Q')

5%

275-970

~

2200

7tCC1R

Q

2V-3b

ql2AX7

E:CCllJ

3C-le"

T+

15

......

2R-:11

]'}o

V'::E

330

J(

<

2eur

.7

3C-\6b

T+

"

>-'-

3';0

v.J.:

2V-h

12AX7/ECC'83

-

2R-H

2C-11

45·2A

1

,7)2

LC1R

015

~

15CG1R.

m/rrr 4-5-2B

.'\,

_

,do

v .

!HIGH

IMPEDANCE

PLAYBACK

H[A:..Di====

~

~__-

,

-

0Q~

PLAYBACK

fci~~'r--,A---

...

_".,,-

....

_-i·C_/\

/'

p

r---1~+-'-"i\-

~~~

2C-15

~~'i~5-+,~,

__

-,

I

,,/~_

HEAD

",

IL'

c-'

.oqJ2-

2R-30

EQUAL,

Q

P

0'

-L.'V'S"t\.·

....

A5"O,,0"lK.n~7Y,

SWITCH

'U

"'"

45·2C

2R-2. 2R-31

j'5CCIR

IOM;'G lOoK

-"YV'

'0

(LOW

IMPEDANCE

PLAYBACK

HEADI

NOTES:

1.

R~.!IsroR

VALUES

ARE

IN

OHM~

10%.

1/2

WATT

UNLESS

OTHERWISE

•

SPEClflED.

Z.

ALL

CAPACITORS

ARE

IN

MlCRO-

fARADS

AND

RATED

AT

400 V.

UNLESS

OTHERWISE

SPECl

flED.

3

••

SWITCHES

ARE

SHOWN AS

THEY

f1JNCnON,

HOT

AS

THEY

ARE

CON-

STRUCTED

AND

WIRED.

4.

FOR

UNBALANCED

OUTPUT

W1TH

ONE

~OE

GROUNDED,

COWNECT

A

TO

BAT

5TSZ OR

I

TO

PJN

2

AT

5J5.

FOR

BALANCED

OUTPUT

WITH

CENTER

TAP

GROUNDED

CONNECT

G

TO

H AT erst.

5.

JUMPERED

AS SHOWN,

VU

METEH

IS

CAUBRATED

rOR

• B

VU

OUTPUT.

FOR

...

VU

OUTPUT

JUMP

E TO F

INSTEAD

OF

E

TO

0

ON

e"PS3

,SEE

INSTALLAnONl~

READJUST

RECORD

CAUBRAnON

CONTHOL

AS

DE~RJRED

IN

SECTION

V

Of

MAl

NTENA

He

E

MANUAL.

e.

D.C.

VOLTAGES

MEASURED

WITH

20,000

OHM

PER

VOLT

METER

WITH

EQUIPMENT

IN

RECORD

MODE

AT

1I7V.UNE.

7.

~GNAL

VOL

TAGES

MEASUREn

WITH

AC

VTVM

ANtJ

EXPRESSED

IN

db

RE

fERRED

TO

,78

VOL

T5.

CIRCUIT

CONDITIONS

EQUAUZATION

SWITCH 432

IN

'1-1

2"'

PO.!InON

500

CYCLE

INPUT,

LEVEL

CONTROLS

4R!;!

ANt>

4R3£

rULL

CLOCKWlSE.

lJN"E

OUTPUT

5J5

T~R

MlNATED

IN

NOIollNAL

eoo

OHMS.

O~IL

LA

TOR

TUBE

1

ve

REMOVED.

1,000

OHM

R[.!ISfOR

SUBSTITUTED

FUR

RECORD

HEAD.

INPUT

TRANSfER

SWITCH

451

IN

MJCRO-

PHONE

PO.!InON.

RECORD

REU,y

3KI

ENERGIZED.

NOTE:

UHBALAM:[

OF

2

db

MAY

BE

EXPECTED

AT

2

AND

'1

OF

av~,

5J-7

;.;APE

TRANSPORT

SPARE

2R-21!1

leoo

.'\,

4CR·Z

'R-33

10

MEG.

,

3 -

~4.s-h

I

4R-36

25u

K

,

I

PLA

YBACK

I

l:EVE

L :

L-

___

_

GREEN

~

',REEN

VEL

;::>

~

ro

it:.\ it:.\

4

I

>C~:~:.~

.r:

3R-1}1 I

m+rr

>-

I1LUE 1

I.S

2\,-3.

IV-2

IV-I

YEL,

IW

12A:x1

t2AT7

12AX1

Jr_u

1+

~'~

'--'~2'

'0"['

T

-1.:

9 9 9

OC

15

\r

-

-=

~LUE

6CH.-1

THE

nAST

NUMB

:R

OF

TIH

~HEMAne

RE:FERE~CE

NUMBER

!'JGNIFlE

')

THE

LOCATIUN

I

REcor,'

AMPLI

F1ER

BOARD

2.

R£PR()I

UCE

AMPLIFlER

BOARD

~

POWER.

;UPPLY

BOARD

4

fRONT

I

ANEL

or

AMPUF1ERCHA~S

S.

BACK

p

...

NEL

Of

AMPU

flEA

rHAs..."IS

6. SIDES

Ar-.ll

BoTTOM

OF

AMPUflER

eH.ASSlS

.L

CIRCI

!T

uROUr-.'D

~

eHA

.1SGROU

....

'D

o r

,_"

VI

LfAGES

o

gGN

....

L

\r

lL

rAGF.S

IR-23

8200

SCH

EMA

TIC

DIAGRAM

elECTRONIC

ASSEMBLY

MODel

300

MULTICHANNEL

CCIR

EQUALIZATION

CATALOG

NUMBER

30960

o

31537

A

I

5C-IJ

lC-lO

--L 15 _

130

pF

."

TL

__

.-!.",-1~~:-

;1Z:B:T:O:A~!t_--41'-'!....----_tiJ_--------....,

I

~

~1A5

.c-

..

~

Itll

,0027

5Yo

Ri.~;;RD

:

ADJUST

33

rf

~

HEAD

~---------------------,

v.v

.

.S-.!c T•

~.

BlAB

0 :

ERAS[

•

RECORD

I

R~2~4'~·

,

<:ft?~

".,

<~,

.....

-

PART

OF

KI02

IN REC.

ELECT.

DO

NOT REMOVE WITH POWER ON.

r----'

I I

I

SEE

TEXT

,SPECIAL! CONSIDERATIONS, n.

PbAYBACK HEAD

'NPUT

NOTES

~

R202

I

MEG.

V201

12SJ7

43V

46Y

C202

4

450V

25V.

<;206

.pG6

406y

R205

RZ'e4

lOOK

5K

<

ww

r50V

V202

VRI50

ALL CAPACITIES IN ft\ICROFARADS

AMPLIFIER

WIRED

FOR

RBMOTE PLAYBACk.

LEVEL

CONTROL

IN

METER PANEL

.---------1

I

C209

I

I"

I

HI :

I

C204

.I

~

A20a

10K

2

W.

I

.25

A

r----J

C

1 I

1

J203P

1

I.

I

I 1

L·

_

__

_ _____1

8

3.

600

OHMS CONNECT TO I

66,

JOIN 3

TO

4

333

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Ampex 300 Owner's manual

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