3.2 Tuning the bias traps
The following procedure is suggested for tuning the filters L l/T 855 and L 2/T 855
(see schematic G 36, 6) on the output of the stages V 5. 1 and V 5.2 :
The record circuits of both channels should be switched on by depressing the buttons
“record” and channels I + II (stereo), causing the oscillator (V 12) to generate 70 kc/s.
The record level controls P 3 and P 4 remain closed. A VTVM or oscilloscope with a
sensitivity that assures useful deflection at 1 mV 100 kc/s should be connected to pin
1 on the socket of V 5 (Plate, Channel I) and the slug of L 1 (Fig. 14) is to be tuned
for a minimum reading. After connecting the VTVM or oscilloscope to pin 6 of the
same socket (Plate, Channel II) the slug of L 2 should get tuned analogue to the
above.
Tuning of the bias filters on the cathode follower outputs V 9 and V 11 (not obtained
in the early version of the G-36) :
The record circuits should be turned on as described above. With the VTVM or
oscilloscope connected to the cathode follower outputs A - K I and A - K II the slugs
of L 3 and L 4 (Fig. 14) respectively should get tuned for minimum indication on the
test equipment.
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