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Millet Max tube bias problem. trimpot has no effect

post #1 of 2
8/12/11 at 11:22am
Thread Starter 

 

I just built 2 Millet Mosfet Maxs and I am at the biasing part. The first Millet biased correctly and everything seems to work as expected.

On the second millet the right tube biases fine, but the left tube is stuck at 23.35V ish and turning the trimpot either way has no effect on the voltage. How should I go about troubleshooting?

Thanks.

 

Extra info:

the right tube is at 13.5v, and the amp is at 27V across the power supply. All leds light and both tubes glow and get warm. Mosfet bias measures zero.


Edited by ryli - 8/12/11 at 11:32am
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post #2 of 2
8/12/11 at 4:52pm
Quote:
Originally Posted by ryli View Post

 

I just built 2 Millet Mosfet Maxs and I am at the biasing part. The first Millet biased correctly and everything seems to work as expected.

On the second millet the right tube biases fine, but the left tube is stuck at 23.35V ish and turning the trimpot either way has no effect on the voltage. How should I go about troubleshooting?

Thanks.

 

Extra info:

the right tube is at 13.5v, and the amp is at 27V across the power supply. All leds light and both tubes glow and get warm. Mosfet bias measures zero.


Sounds like you got it working - see my detailed reply in your other thread.
 

 

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