Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kerobit on June 06, 2022, 11:34:06 pm

Title: Larmar PPIMV on 18watt marshall build wont go completely silent?
Post by: kerobit on June 06, 2022, 11:34:06 pm

I installed a Lar Mar style master volume in an 18 watt marshall build. It works, but it only goes so low, the amp is still fairly loud the whole time, but it helps. Any ideas other than a faulty pot?

Title: Re: Larmar PPIMV on 18watt marshall build wont go completely silent?
Post by: d95err on June 07, 2022, 01:57:30 am

Is it a standard 18w-build (Marshall 1974)? Any variant? Any mods? Please post the schematic (or a link to it).

Have you measured the resistance to ground on each side of the pot when you turn it all the way down?

Title: Re: Larmar PPIMV on 18watt marshall build wont go completely silent?
Post by: pdf64 on June 07, 2022, 03:50:54 am

Photos of the build and the master volume?

Title: Re: Larmar PPIMV on 18watt marshall build wont go completely silent?
Post by: sluckey on June 07, 2022, 04:16:51 am

Quote from: kerobit on June 06, 2022, 11:34:06 pm

I installed a Lar Mar style master volume in an 18 watt marshall build. It works, but it only goes so low, the amp is still fairly loud the whole time, but it helps. Any ideas other than a faulty pot?

If the pot is good then you have a wiring error.