BIAS ADJUSTMENT - HELP needed!!!

miku taivaanlahja

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3.5.2009
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2
Hello
I'm new here. I live in Finland and I have Chinese Musiac Angel on KT88 tubes. It requires bias adjsutment. I dont have equipment to do it. Could anyone help me with that, please?
I live in Helsinki area.
 

K J Manner

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20.10.2006
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2 086
Have it bias pots for adjustment? Are they under the chassis or adjustable without opening the machine?

How do you come to the situation? Aren't the tubes matched pair?
 

Jari

Kaupallinen toimija
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8.9.2006
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15 082
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Espoo
Here's an article about tweaking your amp - forget the tweak part, search for word bias and you find instructions how to perform the bias adjustment.

Maybe someone else can supply better instructions?
 

K J Manner

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20.10.2006
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2 086
^ I just find the same instructions. "In red circles are power tube biasing pots" There are four pots - each for every KT88. That way it is not necessary use macthed pairs or macthed quad.

You need a voltage meter. The job is easy, but need some patiency and care. Current is deadly there!
 

miku taivaanlahja

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3.5.2009
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2
Hello and thanks for all the answers.
So, I bought it online, and originally it came with broken kt88 tubes. I have received new set, but its humming. I have opened it (you can't adjust bias without opening)
I tried to do sth, but when I tried to do it myself, I got serious kick from somewhere, so I prefer that someone else will do that :)
 
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