Ferrograph 632 H Service Manual

Page 2

FERROGRAPH

MODELS 632. 634 81 632H

SUPPLEMENTARY
NOTES
with
Revised Circuit Details
Serial No. 6/50.000 onwards

Page 15

4.3. Simuluneou twin channel recordings. «4.. Stereo

For this ol'eounte external nmpiiliert end loudspeaker: will be required end thould
be connected (without main- urths of their own) to the upper and lower truck output
iaclu.

Taking lint u pre-reeorded half traclt rtereo trpe.

Arnnge the loudnpealtera at the recommended spacing given by the tape monu-
fauuren. (if none is mentioned, 7 to 10 feet apart ia the initial dintutoe).

On the model 634. check that the monitor head lever. [Q in Pig. 2), in fully forwud,
i.r.. head in in "down" position.

Cheek panel commit.

Knob I. 2. 5. 6, It tern.

Knot» 9 and I0 advanced to tay 5.

Switch 4 to TAPE petition.

Run the upe. end adjutt Itnoht 9 and 10. together with the external amplifier gain
controls. to the dcritcd output level. llno external amplifiers are connected. both slgrulr
vrill he heard "mount-ally" on the internal loudipeolter.

Nor: :-Il' the external atnplilier: have exactly the tame amplification. a balanced
output nhould be obtained if ltnoho 9 and lo It: not to the aarne dial reading. 111': will
apply over most of the tonic but ilight individual adjustment: may he neemuy for
optimum balance.

4.4. Model not Only

For piuyhult of Mt melt ttereophonie tape: at above. the playback heod thnuld he
in the down" petition (head lever Q forward).

For the replty ofquarter tuck ttpeo the operation and the control netting will be
identical but the playhoct head Ihtvuld be in in "up" position (heed lever Q back). At
the end of a quarter truck tteeeo recording the upe La reverted and played back (or in
harmony done with half track mono tunes). For rnonaurni quarter track recordingl.
the normal playback tequenoe oi' the four track will be the tame a the recording sequence.
the ritual order being given in Section 6.6.I.

I. TO REWIND

Set the min function switch to the wind hock petition, next to record. The automatic

ttop um will retract from the lope and it therefore inoperative when fut winding. to that it is
trivia-hie to remcin in the immediate vicinity of the instrument during thir thort opcrttion.

Start the mechanism in the tonal way when the tape will be rewound at high apeed. If

the playback grin eontmla (knobs 9 and [0) hove been left advanced, a high tpeed garbled round
will retult u the tape pm over the monitor head; thin is alien useful for cue-ins or place
locution on the upe. but if underin one or both knob: thould be returned to tero.

The indicator clock will iiowly return to the reading it had at the commencement of

recording or playback and at Ihia point the rewind may he ttopped by depreuing button (3).

I4

Page 63

Annuals B-amn'ntm!

COMPONENTS LIST FOR MODELS 0828 AND we (HOV, I0 e.'e]

The component values for then model: ere :- detelled for Model- mu end GNU above.
with the following exceptiom.

ctlctm

w" VALUI umm Dmtrtlon mt Nos.
R2 250 u 27W Vitreous Emmel IP.'2808 .R
Cl 13F 300V Piper AC. Working BP.'7IB.'C
TM Mllm Transforms MC ,t'RI673
Xl Wind On Motor MC 5210 HS
X2 Cepnun Motor MC 55054 ,t'l l0
X3 Wind Back Motor MC 15229175
F82 Fm 2-5A lll.'l272 .F

COMPONENTS LIST FOR MODELS III AND I34 (U, I1 OR A)

The component wine: for time modeh an In detailed above for Models 632 end 634
(U. B on- A mpeetively). with the following eeeeptionl.

cnuctm

m. VALUE mum; nuscmrncm m1 nus.
Cl! ~2mopr Selected et Wash

cue 'I.500pl' Selected et Watt»

CZ? '2.000pf Selected It Wort-

cza 'IJDOpr Selected It Work»

CS7 'lZDOOpf Selected I! Work:

(:55 'IIODOpI Selected It Work:

1.2 Treble Boo-t Inductee MC 3727

L3 . Treble ant Inductor MC 3727

Velua ue nomiml only. Acme] velua are selected tinting tettlng up.

63