KT88 PP fixed bias
Posted:
Wed Apr 15, 2015 9:39 amby kuchen
Hi everybody,
I would like my Kt88pp change to fixed bias, is it R21 and R19 change to 2k ohm 5w potentiometer?
Please help~~^.^ Thank you very much~~
Re: KT88 PP fixed bias
Posted:
Wed Apr 15, 2015 12:40 pmby azazello
For fixed bias You need minus U about 40-50 v connected to two grid resistors of KT88 /grid res-s 470 kohm disconnect from ground and connect to minus U cross adjusting trimmer resistors about 20-50 kohm and adjust plate currents the sames, that was in autobias mode/. Your power transformer must have about 50 VAC/.
Re: KT88 PP fixed bias
Posted:
Wed Apr 15, 2015 9:09 pmby Geek
Those 3300uF after the regulators, get rid of them. Let the reg's do their job
