Bias Blackstar one 104 6l6

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Bias Blackstar one 104 6l6

Post by alexdreamworld on Sat Aug 17, 2013 12:46 am

Hello,

I would like to adjust bias for my Blackstar one 104 6l6.

I measured the original a very cold bias on the power tubes.

(26 Ma, 32 Ma, 27 Ma, 30 Ma on 4 tubes supposedly appaired)

So on the pcb card is two adjustable resistors:

My question is this PR1 that must be addressed and not touching the other variable resistor?

The adjustable resistors are not next to each other.

alexdreamworld

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Re: Bias Blackstar one 104 6l6

Post by johnd5412 on Tue Jan 14, 2014 6:14 am

Did you ever figure this procedure out and if so can you share it with me as I have the same model.

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