Sony TC-K333ESA Service Manual page 7

Making an Optimum ©
Recording
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Although bias currrent and equalization are
automatically set by the Automatic Tape
Selection (ATS) function for the tape being
used, you can use the REC EQ CAL switch
to change the recording characteristics
according to the nature of the source
material or to compensate for the particular
characteristics of the tape.
REC EQCAL
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To emphasize higher
frequencies in recordings
For normal recordings
To dampen higher
frequencies in recordings
Bias Calibration Recording
Use the REC EQ CAL switch in conjunction
with the BIAS controi to modify bands of
sound and record according to the tape's
characteristics.
¢ When recording music which has
strong middle and low frequencies
Set the bias at flat with the REC EQ CAL
switch set in the HIGH position to increase
the bias current.
Adjust the BIAS control so that the HIGH
and LOW meters indicate equal readings.
« When recording music which has
strong high frequencies .
Set the bias at flat with the REC EQ CAL
switch set in the LOW position to
decrease the bias current.
Adjust the BIAS control so that the HIGH
and LOW meters indicate equal readings.
Note
With metal tape, because the amount of
frequency characteristic modulation is not in
proportion to that of the bias, the optimum
bias current may not be obtained using the
methods above.
Another use of the REC EQ CAL
switch
When using special tapes, adjusting the
BIAS control with the REC EQ CAL switch
set in the NORMAL position may not result
in equal readings on the HIGH and LOW
meters. If this occurs, adjust the BIAS
control after setting the REC EQ CAL
switch to HIGH or LOW.
TC-K333ESA/K990ES
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What is the Dolby HX PRO
System?
The Dolby HX PRO system provides
improved linearity in high-range frequency
response during recording. Tapes recorded
with this system retain the same high
quality even when played back on other
tape decks.
As shown in Fig. EY , characteristics such
as output level and distortion differ widely
according to the bias (high-frequency)
current.
High
315 Hz
Bias current ———» High
Established bias current
In conventional systems (see Fig. EJ ), the
bias current is susceptible to variations in
certain recording signals which may cause
fluctuations in frequency response,
distortion, or other unwanted
characteristics.
High
| Fluctuation
Output
Frequency ——~® High
With the Dolby HX PRO system, the
effective bias amount added to the bias
current is controlled in millisecond units to
greatly reduce distortion, improving linearity
in high-range response and ensuring high-
intensity recording with minimal distortion
and noise.