300B DC votage

I have a pair of Angela mono blocks that I have converted the 5V supply to the 300b tubes to pure regulated DC, Here's where my ? come in. It's using a 880 ohm resistor with a 20uf cap in Parallel to a the center tap of a 75 ohm hum pot. How do I loose the pot?
Thanks to you techies in advance
I'm not sure from your desription what you have there. I sent you an email. Email back a schematic and I can help you.