Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: clyde on November 10, 2023, 11:18:16 am
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I will be using a 12AX7 with dissimilar cathode circuits and dissimilar coupling caps for each triode, a separate 100k plate resistor for each and will combine the outputs. Are series (mixing) resistors needed after the coupling caps? One triode will be switched out to be used in a cascaded stage which is why I need dissimilar circuits. Thank you.
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In the VOX AC30CC2 they do it this way, joined inputs (and have joined cathodes) but I think you can go also with separated cathodes
(https://i.imgur.com/C2pTePE.jpg)
(https://i.imgur.com/XS4BDau.jpg)
Franco
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Thank you, not quite, I'll only have one volume for the combined outputs. There won't be a "normal" channel.
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I will be using a 12AX7 with dissimilar cathode circuits and dissimilar coupling caps for each triode, a separate 100k plate resistor for each and will combine the outputs. Are series (mixing) resistors needed after the coupling caps? One triode will be switched out to be used in a cascaded stage which is why I need dissimilar circuits. Thank you.
Probably a good idea to use mixing resistors. Might make more sense if we could see an actual schematic.
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(https://el34world.com/Forum/blob:https://el34world.com/68b99092-a47e-47b8-9fa8-25a0aaae0834)
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Ciao Clyde
Revise your schematic, seems that as is it won't work
Franco
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(https://el34world.com/Forum/blob:https://el34world.com/68b99092-a47e-47b8-9fa8-25a0aaae0834)
This will block DC from reaching the anode.
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Sorry, I was in a rush to get out the door at the moment. Let's try this:
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.