Sony TC-K615S - Manual (Page 38)

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TC-K615S-11 32-43
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There are many different types of cassettes
on the market, each with varying magnetic
properties. Although the ATS (Automatic
Tape Selection) system in your unit sets the
appropriate equalization characteristics and
bias current for each tape type, you may be
able to obtain even better results by doing
the bias current and recording level
calibration function described below.
Fig. A shows the BIAS control and REC
(recording) LEVEL control for calibration.
a) Adjusts the bias current within a range
of about ± 20 %
b) Adjusts the recording level within a
range of about ± 3 dB
Bias calibration
Choosing the proper bias current for a tape
ensures minimum distortion and flat
frequency response. Lowering the bias
current boosts high-frequency response, but
also results in higher distortion. Raising the
bias, on the other hand, reduces distortion,
but also dampens high-frequency response.
You thus obtain proper bias when the bias
current and high-frequency response are
well balanced.
Fig. B shows the BIAS control and a high-
frequency response balance chart.
a) Bias reduced (high-frequency response
boosted)
b) Bias increased (high-frequency response
suppressed)
c) Output level in dB
d) Frequency in Hz
e) Bias reduced (–)
f) Bias increased (+)
(Continued on next page.)
Calibrating the Bias
Current and Recording
Level
A
b) a)
BIAS
– +
CALIBRATION
REC LEVEL
– +
e) a) b)
c)
f)
d)
BIAS
– +
B