Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: chocopower on November 20, 2011, 03:26:10 pm

Title: Channel switching in a B.Face Twin Reverb clon
Post by: chocopower on November 20, 2011, 03:26:10 pm

Hi.

I friend is asking me for channel switching in his Twin Reverb.

I have some SPST relays and want use them for the job.
The "normal" channel imputs will be the imput for boths channels. From there, it will go to the relay common pin.
It switch betwen the 2 sides of the SPST sending the signal to the imput grid of V1 or V2.
ok. the question. Can i leave the "unused" channel without grid leak reference?
I supose that shouldn´t, but i like to ask...

If not. i suposse i should use DPDT relays to ground the grids...

thanks in advance and sorry for my english. I had some problems trying to puit in words my question..

Title: Re: Channel switching in a B.Face Twin Reverb clon
Post by: DummyLoad on November 20, 2011, 05:42:46 pm

something like what i attached what you have in mind? i'm thinking you'd want to mute the unused channel.

--DL

Title: Re: Channel switching in a B.Face Twin Reverb clon
Post by: chocopower on November 21, 2011, 02:25:53 am

that´s right.

Grid and grid leak resistors before the relay area. I think i can do it with a simple DPDT relay.

thanks a lot!

Title: Re: Channel switching in a B.Face Twin Reverb clon
Post by: chocopower on November 22, 2011, 02:27:54 am

hi there.

is working. Now, i just want to add a led to the footswitch using the same voltage used to activate the relay.
Is posible? Wich way?

i use that schematic: