Ampex 351 - Page 74

SECTION 8
ELECTRONIC ASSEMBLY
8-1
NOTE
This manual is primarily intended for
recorders using Ampex Catalog Num 
ber 02-30960 electronics. In instances
where there are significant differences
between this electronics assembly and
earlier models using Catalog Number
30750 or 30950 electronics, an appro 
priate notation will be found.
89-0144
Issue A
GENERAL
The electronic assembly consists of a single
chassis on which are mounted three subas 
semblies of etched board construction — the
record amplifier with bias and erase oscillator,
the reproduce amplifier, and the power supply.
Each subassembly is an etched board entity
which can be taken from the main assembly
by disconnecting the edge-on harness connec 
tors and removing 4 mounting sleeve nuts.
On the face panel, facilities are available for
setting record and reproduce levels, selecting
high or low speed equalization circuitry, mak 
ing input transfers for microphone, balanced
bridge or unbalanced bridge inputs, and switch 
ing meter and output circuitry. Visual monitor 
ing of reproduce, record, bias, and erase levels
is provided by the vu meter on the face panel.
Two phone jacks for aural monitoring are
provided, one on the face panel and another on
the back of the electronic chassis. Power on-off
is controlled at the front of the assembly. A
control for the record function, signified by an
accompanying indicator light, completes the
front panel arrangement.