Cayin LA-34 Manuel de l'utilisateur - Page 10
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Top Panel
1
2
①Bias Test Point for testing the bias of the
Channel Power Tube(A1、A2、A3、A4）
②
Bias Adjustment Knob for Channel Power
Tube(A1、A2、A3、A4)
③A1、A 2 、 A3 、 A4 :EL34
④ V1 、 V2 、 V3 :5BK7A
Tube Replacement Method:
After turning off the amplifier for about 20
minutes, hold the base of the tube and pull it
out vertically. By replacing different tubes,
you can enjoy different representations of
timbre.
◆ Be careful of the high temperature of the tubes during operation.
◆ Replace the tubes carefully and correctly.
◆ Power tubes must be matched for well function.
9
O U T P U T T R A N S F O R M E R
WIDE FREQUENCY RESPONSE
V
V
+ -
+
BIAS TEST POINT
2
1
A
A
BIAS ADJ.
2
A
1
A
2 5
7
V
BK
A
3
P O W E R T R A N S F O R M E R
O U T P U T T R A N S F O R M E R
WIDE FREQUENCY RESPONSE
1 5
7
V
BK
A
4
A
3 5
7
V
BK
A
4
3
EL34 Current Testing
When you're sure the connections are right, turn it
on by pushing the power button, then the indication
lamp will light up, then wait for about 10 minutes.
Connect the test lead of DC. V meter (or multi-
meter) to the (V1) terminal. Adjust the (V1) Bias Pot
t o m e a s u r e t h e D C . V o l t a g e a r o u n d
0.3V~0.35V(that means the static current is around
30mA~35mA for V1), and do the same procedure for
(V2)(V3)(V4).
Testing the current after using the machine for
about 150 hours can obtain the best state.
NOTE
V
V
1
+ -
+
BIAS TEST POINT
2
3
4
A
A
BIAS ADJ.
3
A