UAD Powered Plug-Ins Manual - 169 - Chapter 12: Ampex ATR-102
11. Increase Bias (clockwise) until the meter level is reduced by –3.5 dB from
its maximum (for 3.5 dB of overbias; see Manual Calibration Notes).*
*When calibrating at 3.75 or 7.5 IPS, the tone generator is at a lower level, therefore meter resolu-
tion is decreased. To increase meter precision when adjusting bias at the lower tape speeds, con-
sider temporarily increasing the reproduce level.
Record Level
Calibration
12. Set the Tones frequency to 1 kHz.
13. Adjust Record (input) so the Meters display the level in T
able 11 below
(the level depends on tape speed).
Record EQ
Calibration
14. Set the T
ones frequency to the value in Table 12 below (the frequency de-
pends on tape speed).
15. Adjust Record HF EQ (not to be confused with Repro HF) so the
Meters display the level in Table 11 above (the level depends on tape
speed).
Note: If HF EQ is adjusted by a large amount, it may be necessary to reca-
librate the record level (steps 12, 13).
The manual calibration procedure is complete.
For related information, see the Manual Calibration Notes in the next section.
Table 11. Meter Levels for Record and HF EQ Adjustments
Tape Speed Meter Level
3.75 IPS –20 dB
7.5 IPS –10 dB
15 IPS 0 dB
30 IPS
0 dB
Table 12. Record HF EQ Calibration Frequencies and Levels
Tape Speed Tone Frequency Tone Level
3.75 IPS 5 kHz* –16 dB
7.5 IPS 10 kHz –6 dB
15 IPS 15 kHz +4 dB
30 IPS 20 kHz +4 dB
*Note: 7.5 kHz is specified in Ampex manual.
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