Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on December 22, 2023, 07:38:34 pm

Title: Bias supply from Voltage Doubler HT supply
Post by: TIMBO on December 22, 2023, 07:38:34 pm

Hey guys, Is there a way to tap off a - bias supply from a standard voltage doubler HT supply

Title: Re: Bias supply from Voltage Doubler HT supply
Post by: sluckey on December 22, 2023, 07:43:00 pm

Quote from: TIMBO on December 22, 2023, 07:38:34 pm

Hey guys, Is there a way to tap off a - bias supply from a standard voltage doubler HT supply

Show us a schematic of your "standard voltage doubler HT supply".

Title: Re: Bias supply from Voltage Doubler HT supply
Post by: TIMBO on December 22, 2023, 08:07:10 pm

Apologies sluckey, I got lazy and asked before I look into my own schematics.

Title: Re: Bias supply from Voltage Doubler HT supply
Post by: jewishjay on December 25, 2023, 09:29:08 am

What's the function of the pair of .22u caps? Never seen that in in a bias circuit before. I always just see resistor > diode > voltage divider.

Title: Re: Bias supply from Voltage Doubler HT supply
Post by: sluckey on December 25, 2023, 10:06:12 am

Quote from: jewishjay on December 25, 2023, 09:29:08 am

What's the function of the pair of .22u caps? Never seen that in in a bias circuit before. I always just see resistor > diode > voltage divider.

Page 10 of this pf explains it...

     https://sluckeyamps.com/misc/Amp_Scrapbook.pdf