Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Underwood on November 23, 2014, 03:25:30 pm

Title: SUper reverbv bias
Post by: Underwood on November 23, 2014, 03:25:30 pm

 :w2:
Hello,
I have been having a problem biasing my super reverb. I can only bias my tubes up to 38ma. I have a 470 ohm resistor in the bias circuit and have a 27K on the bias pot. What do I need to change?

Title: Re: SUper reverbv bias
Post by: sluckey on November 23, 2014, 04:19:30 pm

Quote

I can only bias my tubes up to 38ma.

If that means you would like more current then replace the 470Ω with a larger resistor (680, 820, or 1K) or replace the 27K with a smaller resistor (15K, 18K, 2K, 22K, or 24K). Use same wattage as the one you will replace.

An if you want less current, do the opposite.