MOSFET Source Follower Screen Grid Regulator - diyAudio
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Old 23rd March 2012, 02:14 AM   #1
mbeards is offline mbeards  United States
diyAudio Member
Join Date: Mar 2012
Default MOSFET Source Follower Screen Grid Regulator

Hi everyone,

So im working on an amp project with a B+ of 450V

I need supply the screen grids of the 6146W power tubes with 230V. I was recommended to use a source follower regulator with a mosfet and zener to regulate the 450V. I was also told to add an electrolytic cap across the zener to get rid on any ripple/noise.

Im wondering how to implement this circuit as well as an explanation on calculating the needed resistors and zener.

I cant seem to find too much on this one on the internet.

Im am a studying EE but haven't really gotten into any transistor circuits. Thats for next semester.

Thank you!
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Old 23rd March 2012, 03:03 PM   #2
FLT is offline FLT
diyAudio Member
Join Date: Nov 2009
Default Look at this


look at this circuit:

Mosfet stabilized power supply for Tube Amp| Circuit Project

All you have to do is re-calculate the values to your voltage.

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