what would happen if the tube with the lower heater voltage rating is used in a preamp designed for the 6 volt version?It will burn out and could cause a short in some cases. The filament will most likely break off and could touch something else. I wouldn't even think about trying it. If you put a 6 volt tube in a 2 volt tubes socket, it would never warm up enough to start working right.
Ruben1 (Threads | Answers | This Thread)
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