Mixing parallel triodes

[clyde]

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.

[kagliostro]

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





Franco

[clyde]

Thank you, not quite, I'll only have one volume for the combined outputs. There won't be a "normal" channel.   

[sluckey]

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.

[clyde]

[kagliostro]

Ciao Clyde

Revise your schematic, seems that as is it won't work

Franco

[stratomaster]

This will block DC from reaching the anode.

[clyde]

Sorry, I was in a rush to get out the door at the moment.  Let's try this:

[PRR]

.