Ampex 351 - Page 12

Power Requirements
single track equipment 4.5 amperes; dual track
Width Weight
Tape Transport
19
50
19
18
21
38
13
9
80
13
21
161/2
ooia
2-4
24%
20/4
155
69
281/2 (max)
17
Console
Two Case
Portable
Electronic
Assembly
Console
Tape Transport
Case (Equipment
in Case)
Electronic Assy.
Case (Equipment
in Case)
Two Track Stereo 
phonic Electronic
Assy. Case (Equip 
ment in Case)
FREQUENCY IN CYCLES PER SECOND
Head output and compensating equalization
Reproduce equalizers may be either fixed or
variable. Fixed equalizers will follow the equal 
ization curve within the tolerances allowed and
89-0144
Issue A
Dimensions and Weight
(in.) (lb.)
Rack Mount
EQUALIZATION CHARACTERISTICS
General
The following paragraphs briefly describe
the various equalization characteristics avail 
able so that the user may choose the equaliza 
tion best suited to his application. Proper equal 
ization requires the use of a reproduce equalizer
which follows a standardized reproduce curve
and a complementary record equalizer which
is used to achieve flat over-all response.
Up to a certain frequency (in the neigh 
borhood of 1000 to 2000 cps depending on tape
speed), the output of the reproduce head of a
tape 'recorder will increase directly with fre 
quency. Above this frequency, the output of the
reproduce head decreases. The reproduce equal 
izer produces a decaying slope that compensates
for the increasing output of the reproduce head
below the frequency at which peak output is
obtained. The record equalizer is used to com 
pensate for the decreasing output above this
The half track and single track equipment requires 2.0 amperes
at 117 volts ac and is available for 50 or 60 cycle line frequency.
Two track equipment requires 2.5 amperes at 117 volts ac, 50 or
60 cycles.
When the Ampex Model 375 Precision Frequency 60 cycle ampli 
fier is used with the equipment, power requirements are greater
by 2.5 amperes:
5.0 amperes.
frequency. The equalizers have been designed
to obtain an optimum in the overall record/re-
produce system between signal-to-noise ratio on
one hand and tape overload characteristics on
the other and are related to considerations of
the relative spectrum energy distribution of
speech and music.
EQUIPMENT
Item
153/4 8
(rack space) (behind rack)
7 8I/2
(rack space) (behind rack)
48 (max)
151/2
AVAILABLE
Height Depth