Simplistic MosFET HV Shunt Regs

Out of curiosity, and to make sure that there is no problem with the board or the GB kits, I quickly solder and tested one more SSHV2. It took an hour to build and test it.
As you can see all went fine and there is absolutely no problem.
Felipe, I think that you are doing something wrong on your build, maybe some photos would help.
 

Attachments

  • 2012-04-11 18.55.32.jpg
    2012-04-11 18.55.32.jpg
    274 KB · Views: 413
  • 2012-04-11 18.54.32.jpg
    2012-04-11 18.54.32.jpg
    285.8 KB · Views: 393
Member
Joined 2009
Paid Member
Member
Joined 2009
Paid Member
George I don't have words to describe the very big upgrade using the SSHV2, I never suspected that tubes can reach same or very near level of information like SS, now I understood (thanks to Salas) how much important is to have a very good shunt regulator, also thank crt to his layout & to Tea-Bag for the GB and all people like you & others testing the beta boards to be possible all of us enjoy your splendid work, thanks to everybody involved.
 
Member
Joined 2009
Paid Member

Attachments

  • puresound p10 original psu.jpg
    puresound p10 original psu.jpg
    155.7 KB · Views: 419
diyAudio Chief Moderator
Joined 2002
Paid Member
Good report, ending well = all well. I don't think that any hum has to do with line ripple especially when with regulated B+. First of all 100Hz ripple would sound more like a 'bzzz', its harmonic noise with many midrange peaks, 50Hz sounds deeper like ''hUmmm''. Can be some small ground loop or field. Possibly. Even instability, but that normally sounds bad too and heats up much.
 
Member
Joined 2009
Paid Member
I increased 220uF the PSU but isn't fixed.

I grounded the MM RIAA chasis because Speakon is only 4 pole (2 for heaters + 2 B+) so I wired one cable between GND chassis PSU to GND chasis MM RIAA & the hum isn't fixed, I have the same level/amount of hum but the tone changed seems more low after seemed more high.