Top Panel
9
1.Be careful of the high temperature of the tubes during operation.
2.Replace the tubes carefully and correctly.
3.Power tubes must be matched for well function.
NOTE:
①.
②.
③.
④.
V3
、
V4:12AU7/ECC82 Tube
⑤.
V1
、
V2:12AX7/ECC83
⑥.
Bias Selector Switch
(
A1
、
A2
、
A3
、
A4)
Used to select corresponding tube for bias
adjustment.
Bias Adjustment Switch(A1
、
A2
、
A3
、
A4)
Used to adjust bias of corresponding power
tube(A1
、
A2
、
A3
、
A4)
Turn the Tube SEL. to position KT88 on the rear
panel, if you are going to use KT88 Tube.Turn the
Tube SEL. to position EL34 on the rear panel, if
you are going to use EL34 tube.
Bias Meter
Used to monitor the working current of the
power tube.
A1、A2、A3、A4:KT88/EL34 Tube
Tube
A
Diagram 5
Bias meter during working
Note: When working normally,
the pointer should stay within
the A zone, still , it would move
for the voltage fluctuation.
Diagram 4
Bias meter when not working
1
2
3
3
6
1
2
4
5
Diagram 3
：
CS-55A
TOP
B
ias adjustment for the power tube:
Turn the BIAS SELECTOR Switch to the
power tube you are preparing to adjust. Adjust
the corresponding BIAS ADJ. small knobs with
flat screwdriver, and inspect the BIAS meter on
the top panel and make sure the pointer keeps
in the center. Bias adjustment for A1, A2, A3,
and A4 are the same. After all have been
adjusted, do it one more time, to make sure all
the bias level of A1, A2, A3, and A4 are the
same.
Sample of Bias adjustment for power tube
A1:
1. Turn the BIAS SELECTOR Switch to A1;
2. Turn the BIAS ADJ. knob A1, until the
pointer of the bias meter keeps in the center.
The same for A2, A3, A4.