Master Volume

[Throstur]

Few years back I put a gain stage and a master volume into 50W plexi and also a bassman. Worked out fine.

I am now building a bassman and there is an extra hole where the ground switch is supposed to be. I thougt it would be nice to keep both normal and bright channel and put a master volume in there. Anything against this? Does anyone have a schematic or layout that shows how this could be done?

[navdave]

Put a 500k or 1M audio taper after the tone stack before the phase inverter.
Sunn Model T has one.

[sluckey]

The ground switch location is usually very near some high AC voltage. That's a noisy location for low guitar signal.

[navdave]

What if he uses shielded cable?

[sluckey]

A lot of old cheap amps actually put the AC ON/OFF switch right on the volume control, so you can do it. Using shielded cable will definitely be a good idea. I'd still rather have the MV mounted somewhere away from noisy stuff though. Maybe remove one input jack? Drill a hole at a less noisy location? etc? Lots of options on a new build that would be better than the ground switch location. It will work there though.

[Throstur]

A lot of old cheap amps actually put the AC ON/OFF switch right on the volume control, so you can do it. Using shielded cable will definitely be a good idea. I'd still rather have the MV mounted somewhere away from noisy stuff though. Maybe remove one input jack? Drill a hole at a less noisy location? etc? Lots of options on a new build that would be better than the ground switch location. It will work there though.

I´ll in this case throw it in the ground jack hole and wire it with shielded cable just ´to see if it works. If it makes noice I´ll just throw it out again. The reason is that I have a chassis from Mojo that is already drilled, chromed and marked. I´ll get back with results.