Ampex 351 - Page 18

R4
I5K
R3
22
Microphones with 50 ohms or less impedance.
3-3
Rack Mounted Models
Mount these versions of the equipment on
a standard 19-inch relay rack with the mechan 
ical assembly above the main electronic panel.
Center tap grounded balanced output and strapping
for 4VU output.
SHOWS CENTER TAP
GROUNDED BALANCED OUTPUT
STRAP EF ------
AND
UNSTRAP DE
MDB (0 VU
ON METER).
High Impedance Amplifier Input
Wire the mating connector so that pin 3 of
the line out connector, J5 is connected to the
high side of the amplifier input. Strap pins 1
and 2 of the mating connector for connection
to the ground side of the amplifier input. The
line out termination switch S4, must be left
in the ON position at all times.
LINE (
INPUT
R2
22
R5
4TK
89-0144
Issue A
To obtain a center tap, grounded balanced
'output, strap the black lead of transformer T3
to ground at the tie point shown in the illustra 
tion.
Plus 4 v-u output can be achieved by unstrap 
ping D and E at transformer T3 and strapping
E to F. Readjust the record calibration accord 
ing to the instructions in the “ Alignment and
Performance Checks ” paragraphs in SEC 
TION 8.
Microphone Input
Any low impedance microphone having a
nominal impedance between 30 and 250 ohms
can be plugged directly into the equipment.
Wire the mating connector so that the micro 
phone is connected to pins 2 and 3 of LINE
INPUT, JI. The cable shield must be connected
to pin 1. Place the input transfer switch, SI,
in the MIC position.
S-l
INPUT TRANSFER
SWITCH
UNBALANCED
BRIDGE |
OUTPUT
A mating connector for LINE OUTPUT is
supplied. The user must fabricate his own
cables, using the connectors supplied with the
recorder.
INPUT
During this discussion refer to the foldout
illustration — Schematic Diagram-Electronic
Assemblies at the back of SECTION 8.
MICROPHONE
BALANCED
BRIDG E
Fl
Studio Line
Plus 8 v-u, 600 ohm line output, balanced
or unbalanced, is available across terminals 2
and 3 of the line out connector, J5. Pin 1 is the
chassis ground.
If unbalanced output is desired, wire the .
mating connector so that -the pin 2 side of the
line is tied to ground or tie A to B at TSL Supply
600 ohm termination to this output at all times
to maintain correct meter calibration while
recording or reproducing. If the output is not
feeding a terminated line, or if the output is not
connected, such as on remote pickups, the line
out termination switch, S4, must be left in the
ON position.
POWER CONNECTION
Connect the power cable from the a-c
POWER input connector, J8, on the electronic
assembly to a convenient 115 volt a-c power
source.