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UL/triode mode switch question

gadget73

gadget73

junk junkie
Subscriber
I have a little homebrew 6bq5 p-p amp thats currently set up to run in ultralinear mode with a Chicago Standard (now Stancor) BO-13 output transformer. If I were to wire in a switch to flip the screen grid from the UL tap to the plate (making it a triode), would I have to change other components as well? Its currently set up for cathode bias, each tube has its own resistor with a bypass capacitor to ground. I have plans to do some tweaking on the amp, and I was thinking a neat feature addition would be a triode mode switch.
 
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I believe UL and triode operation have similar operating conditions, so you could pull it off. I guess pentode is different enough that you don't often see it as a "switchable" option. I might put a 100-250ohm resistor between the switch and G2 for triode mode, to damp oscillation, but that might be about it.
 
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