Simplistic Mosfet HV Shunt Regs

[buzzforb]

Here is SSHV2.2 for me, corrected orientation and all. Just fit my build better and allowed sharing of heatsink.

[Salas]

Looks like an organized double arrangement. Does it work OK?

[buzzforb]

Dont have the mounting bar for the heatsink. Left it at the shop. Will not know till Tuesday. After my initial panicked failure first time around, I decided to take things as they come and try to be patient. I work much better this way, and tend to bother forum members less.

Side note. How influential are parts like resistors and caps in tthis circuit?

[Salas]

The 10uF capacitors are the most subjectively influential. Then the 0.33uF ones. Lastly the 68K resistors maybe. Better they have good ppm.

[buzzforb]

Got it. Tried MP930? Mills is another. What recommendations for caps. The .33uF is MKP10.

[Salas]

What you got now are fine to start. Much better than average. Try such tests you mention after all is well and familiar. Tubes will be the most idiosyncratic by make and vintage.

[euro21]

Cascode CCS "lower" FET dissipation are marginal, not necessary heatsinking.

In my version ( Simplistic Mosfet HV Shunt Regs ) this position contains DN2540N-3G (TO-92 case).

[buzzforb]

I never thought about it, but is different wire needed for chassis wire up. I use Radio Shack 20ga.

[Salas]

Originally Posted by euro21

Cascode CCS "lower" FET dissipation are marginal, not necessary heatsinking.

In my version ( Simplistic Mosfet HV Shunt Regs ) this position contains DN2540N-3G (TO-92 case).

I see different sheen on metal tabs in Buzz's, maybe just Q1 and Q3 on sink per reg in his. Clip-ons for Q2 really not needed.

[buzzforb]

Originally Posted by Salas

I see different sheen on metal tabs in Buzz's, maybe just Q1 and Q3 on sink per reg in his. Clip-ons for Q2 really not needed.

Correct. I put one on Q2 because I had ordered extra and it makes it look neat and organized. I found some surplus 20-40 uF GE motor run caps for $6, will be giving them a try.