Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Gareth81 on January 03, 2021, 06:01:47 pm

Title: Hotswitch Mod - can I use a 3PDT to swicth out the master volume?
Post by: Gareth81 on January 03, 2021, 06:01:47 pm

Has anybody tried using the hotswitch mod with a 3PDT switch to disengage the master volume when normal gain is selected?
Any potential issues?


Many Thanks
Gareth

Title: Re: Hotswitch Mod - can I use a 3PDT to swicth out the master volume?
Post by: pdf64 on January 04, 2021, 02:38:32 am

From The Trainwreck Pages we can see 4 different basic types of master volume arrangements, which are you asking about?
But for any of them, turning them up full should, to all intents and purposes, take them out of circuit, and allow full gain. The loss caused by the master volume track load under such circumstances is somewhere between 0 and -1.5dB, ie negligible.

Title: Re: Hotswitch Mod - can I use a 3PDT to swicth out the master volume?
Post by: d95err on January 04, 2021, 07:12:12 am

Quote from: Gareth81 on January 03, 2021, 06:01:47 pm

Has anybody tried using the hotswitch mod with a 3PDT switch to disengage the master volume when normal gain is selected?
Any potential issues?

Please provide more info about what amp and mod you are talking about.

Title: Re: Hotswitch Mod - can I use a 3PDT to swicth out the master volume?
Post by: Gareth81 on January 04, 2021, 09:22:19 pm

Apologies, I am referring to Doug's hotswitch mod, in a 5f6-a circuit.


https://el34world.com/projects/hotswitch.htm