I’ve wanted to do a Line stage preamp for a long time that would allow one to use various tubes of similar operation, with a topology that would be suitable for any tube inserted, provided they had the same tube base. So I came up with this idea after a line stage protoboard I built. The 9-pin tubes have a heater switch that will allow for series or parallel operation from the same supply. The load resistors to the second triode can be adjusted for any particular load line.
The tubes shown in pic are a pair of 6N6P tubes, that I prototyped. A very nice sounding tube.
The tubes shown in pic are a pair of 6N6P tubes, that I prototyped. A very nice sounding tube.
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