Cayin CS-300A Manuel de l'utilisateur - Page 10
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Top Panel
1
2
.
BIAS SEL
BIAS ADJ
.
3
v5
5
4
/
AR
4
300
/
B
5
① V2、V4:6SN7
② Bias Selector Switch(A1、A2)
Used to select corresponding tube for bias
adjustment.
③ Bias Adjustment (A1、A2)
Used to adjust bias of corresponding power
tube(A1、A2)
④ V5、V6:GZ34S/5AR4
⑤ A1、A2:300B
⑥ V1、V3:6SL7
⑦ Bias Meter
Used to monitor the working current of the
power tube.
◆ Be careful of the high temperature of the tubes during operation.
◆ Please replace the power tubes after switch off in 20 minutes, and follow the suggetion to unplug the
inset the tubes.
◆ Power tubes must be matched for well function.
◆ Forbidden to make the pointer of the bias meter out of the A zone when adjusting the power tube.
◆ Even under normal working state, the point of the bias meter could move for the voltage fluctuation.
9
6
7
6
7
/
/
SN
SN
6
7
6
7
/
SL
/
SL
6
7
2
.
BIAS ADJ
.
BIAS SEL
3
v6
5
4
/
AR
4
300
/
B
5
Bias adjustment for the power tube:
Turn the Bias Selector Switch to its opposite direction
without releasing it, adjust the corresponding Bias
Adjustment Swith with flat screwdriver, and inspect the
Bias Meter on the top panel to make sure the pointer
keeps in the certer. Bias adjustment for A1.A2 are the
same.After all have been djusted, do it one more time to
make sure all the bias level of A1,A2 are the same.
Sample of bias adjustment for power tube A1:
1. Turn the Bias Selector Switch A1 to its opposite
direction without releasing it.
2. Adjust the corresponding Bias Adjustment Switch A1
with flat screwdriver until the pointer of the bias meter
keeps in the center. The same for A2.
NOTE
Diagram 4
Bias meter when not
working
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.