Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Snake5150 on February 24, 2025, 07:37:42 pm

Title: Master volume and grid leak resistors
Post by: Snake5150 on February 24, 2025, 07:37:42 pm

I want to install a ppimv, also want to add grid leak resistors.

I have 220k grid stoppers , so a 250ka dual pot.

Is this value correct even with grid leaks attached?

Title: Re: Master volume and grid leak resistors
Post by: Latole on February 25, 2025, 12:23:40 am

I use often 500 k with success on few amps

Title: Re: Master volume and grid leak resistors
Post by: tubeswell on February 25, 2025, 04:28:26 am

250k for volume and tone pots will work (works in blackface amp stacks).


However, when used as preamp triode grid leak resistors, these resistors will be in parallel with other resistors that are between the signal source and ground/HT, so a 250k will contribute to slightly higher losses than 1M would. But that doesn’t really matter if your preamp has a few stages in the signal chain. I wouldn’t worry about it