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Re: Build ideas for Allen Wright PP-1C Push Pull Power Amp

The gain should be fine but it depends on your choice of output tubes as well as your CD/DAC. It takes more to drive a 300B than an el84 (and Allen does drive 300B's!). You can use any number of output tubes depending on the output transformer you pick. Typically 5K for el34/6550/300B/2A3 and 8/10K for el84/6v6. The 12ax7, IMHO, would be a very poor choice.

You can use UL and you can use a smaller cathode bypass cap but if I was going to follow someone else's design I would go with the parts they speced because I would assume they had a reason:) You don't show the power supply part but be sure not to cut corners there.

Fixed bias is fine but I'd avoid global negative feedback. If the output tubes are triode strapped I think you can without problems. But it depends on your speakers to some degree.


Russ

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