How so, Gary? If you don't mind saying.
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What characteristics do you get from parallel tridoes?
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Well, when I brought up my first 5 watt prototype amp, the first gain stage was a pair of 12ax7 in parallel, but each gain stage had fixed bias instead of cathode resistors, and each gain stage has a different value plate resistor which gives that amp it's unique complex tone. It's also using the fixed bias that dumps most of the hiss content generated by the pre-amp.
-g
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