Ampex 351 Series - PERFORMANCE CHARACTERISTICS

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when ordering equi pment.
Several mounting arrangements are offered
-c onsole, tw o case po rta ble, and rack mount.
In the portable equipment, one case contai ns
the tap e transport and th e other hou ses th e
electronic assembl
y.
Tap e Width
Tape Speed Pairs
Frequency Response
Signal-to-Noise Ratio
Flutter and Wow
Recording or
Reproducing Time
(NAB 1 O½ In ch Diam eter
Reels, 2400 feet of tape)
Starting Time
Stopping Time
Reprodu ce Timing
Accuracy
Rewind Time
PE RF ORMANCE CHARACTERISTICS
¼-inch
3¾-7½ ips
7½-15 ips
Speed (ips)
3¾
7½
15
R esponse (Cycles per second)
+ 2 db 50 to 7,500
+2 db 40 to 10,000
-+-4 db 30 to 15,000
± 2 db 30 to 15,000
Speed (ips) P eah Record Level to
Unweighted Noise ( db )
3¾ 50
7½ 60 full track
55 h
alf track or two track
15
Same as 7½ ips
Peak reco td level is that level at which the overall (input to outp ut )
t
ota l rms h armo ni c di stortion do es not exceed 3 percent when
measured on a 400 cycle tone. Noise is m easure d when erasing
a signal of peak recor din g level in the absence of new signa l. Bias,
erase and r ep r od u ce amp lifi er noise are includ ed in the m eas ure -
ment. All frequencies between
50 and 15,000 cycles are m eas ured.
Speed (ips) Flutt er and Wow
(per cen tag e rms)
3¾ .25%
7½ .2 %
15 .1 5%
Flutter and wow measurements include all co mp onents between
0
and 300 cycles using an rms value of const ant amp li tude s in e
wave flutter.
Speed (ips)
3¾
7½
15
Half Track
(hrs) (min)
4 16
2 8
1 4
Full T rack
(hts) (m in )
2 8
I 4
32
The tape is accelerated to full speed in less than 1/ 10 of a second.
When operating at 15 ips, the tap e moves less than two inches
after the S TO P button is pressed.
Accuracy
( percentage )
±. 2%
Accuracy
(sec ond)
+ 3.6
Length of Re cording
(min)
30
Approximately 1 minute for a full 2,400 foot NAB reel.
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