On my Hammond conversion amp I have been experimenting with master volume circuits.
I tried the type that is found on the ODS and although it works it just doesn't really allow it to distort very well when the master pot is turned down and the preamp volume is turned up.
I stumbled across this one and I have to say it works pretty good on this amp.
I believe it's called a "Cross Line Master Volume".
When it is overdriven with the preamp volume up quite a bit, it can give a lot of sag which is kind of a cool effect.
Not real tasty when dialed down though.
I had thought to try the post PI master but I don't have a dual gang pot at the moment.
I hadn't seen this one before and not real sure how it is working?
Super simple though.
Anybody see anything wrong with doing it this way, such as will it harm anything to use it?
Master Volume Circuits
Moderators: pompeiisneaks, Colossal
Master Volume Circuits
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Tom
Don't let that smoke out!
Don't let that smoke out!
Re: Master Volume Circuits
Looks like a variation of the PPIMV to me. The outputs of the PI are out of phase. So they cancel each other more and more as the resistance between them gets smaller (i.e. as you dial down the pot).
My Reverend amp does something like that, but they use a fixed resistor value that you can switch in and out. They "market" it as a power switch. It drops it to 2/3s of full power. Not really sure I agree it's a power switch. But I suppose if you consider the PI as part of the power section, then it's valid, cuz your power section will distort earlier.
My Reverend amp does something like that, but they use a fixed resistor value that you can switch in and out. They "market" it as a power switch. It drops it to 2/3s of full power. Not really sure I agree it's a power switch. But I suppose if you consider the PI as part of the power section, then it's valid, cuz your power section will distort earlier.