Help with a cathode coupled pentode driver?
Will this work?
Will I see ~-90 V at the grid of the 211?
How will I bias the 5881? By varing the G#2 voltage?
What's the point of the plate choke? How do you intend to decouple the screen to the cathode? There are a lot of ways of getting the bias right- a CCS in the cathode instead of the choke might be the easiest. And a CCS will cost about 5% of a good choke.
Substitute a CCS or a resistor for the cathode choke. You need the ability to drop about 130 volts. The plate choke is not needed (but might not hurt anything). The screen should be decoupled to the cathode as SY suggested. You need a capacitor from the screen to the cathode.
|All times are GMT. The time now is 12:16 PM.|
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio