In Reply to: RE: This is a fixed bias, Class "A" amp? posted by FenderLover on July 20, 2016 at 06:58:39:
Please describe this boas supply that is consuming this 19.2 mA? That is a little less than 1k at 15V( but that isn't the right voltage, we're dealing with the -30V supply ), that would be the total supply voltage applied to the top of the voltage divider( hopefully including at least one pot ). IOW, with a pair of 10k pots, one for each tube, we have a total bias supply resistance of 5k, or 6 mA flowing through it, plus the grid current( which will be much less than 6 mA ). 1 mA of grid current flowing through a 50k grid resistor gives us 50V...and that for sure isn't happening.Please explain where all this current is going.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Edits: 07/21/16
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- RE: This is a fixed bias, Class "A" amp? - PakProtector 14:35:34 07/21/16 (0)