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Hi,
First post and apologies for yet another amateur's champ-build query. Unfortunately I've not found an adequate answer to my question online or in any of the books I've read.
I want to add a master-volume to the Princeton circuit as I want to try out VVR on the anode and screen of the 6v6 only with this amp. (The original volume control will become a 'gain' control then I guess - and I'll probably add a 10k resistor or so in series with its first lug to ground for that reason).
From googling I've read of others adding a master volume to the VJ and Champ simply by replacing the 220k grid leak resistor of the power valve with a 250k pot. I think it would be better to leave the grid leak resistor well alone though? Perhaps add a 1M volume pot in parallel with it?
Or might it be better to take the 'loudness' control from the part solid-state Champ 25 and place it inbetween the 50s Champ's simple preamp and poweramp sections? Adding an extra coupling capacitor in the process like this? (Would this have any knock-on effects?)
First post and apologies for yet another amateur's champ-build query. Unfortunately I've not found an adequate answer to my question online or in any of the books I've read.
I want to add a master-volume to the Princeton circuit as I want to try out VVR on the anode and screen of the 6v6 only with this amp. (The original volume control will become a 'gain' control then I guess - and I'll probably add a 10k resistor or so in series with its first lug to ground for that reason).
From googling I've read of others adding a master volume to the VJ and Champ simply by replacing the 220k grid leak resistor of the power valve with a 250k pot. I think it would be better to leave the grid leak resistor well alone though? Perhaps add a 1M volume pot in parallel with it?
Or might it be better to take the 'loudness' control from the part solid-state Champ 25 and place it inbetween the 50s Champ's simple preamp and poweramp sections? Adding an extra coupling capacitor in the process like this? (Would this have any knock-on effects?)
Attached Files