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Post subject: Re: 5F11 Fixed Bias
Posted: Sat May 17, 2014 2:58 am
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Rock Star
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stratele52 wrote:
Each amp is different .

Do you mean you adjust negative voltage to have, say -30 VDC at output tube socket , with no tubes in .
And when you put tube in socket you don't have this -30 VDC ?


No. The (-) 30VDC effect the idle bias differently, wrt the specific pair of output tubes.


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Post subject: Re: 5F11 Fixed Bias
Posted: Sat May 17, 2014 3:05 am
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BMW2002Ti wrote:
stratele52 wrote:
Each amp is different .

Do you mean you adjust negative voltage to have, say -30 VDC at output tube socket , with no tubes in .
And when you put tube in socket you don't have this -30 VDC ?


No. The (-) 30VDC effect the idle bias differently, wrt the specific pair of output tubes.



I know but that is not what I mean ( ask ) . Read my question .


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Post subject: Re: 5F11 Fixed Bias
Posted: Sat May 17, 2014 3:58 am
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Stratele, oops! Sorry. Yes. at the grid pin, if you read (-)30VDC without tube, you should read (-)30VDC with the tube inserted.


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Post subject: Re: 5F11 Fixed Bias
Posted: Sat May 17, 2014 4:07 am
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BMW2002Ti wrote:
Stratele, oops! Sorry. Yes. at the grid pin, if you read (-)30VDC without tube, you should read (-)30VDC with the tube inserted.



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