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RE: Opinions on 6P3S for Hi-Fi ?

Posted by Triode_Kingdom on May 8, 2017 at 06:32:50:
That's very interesting, for several reasons. I've come to believe over the last few years that the larger 6P3S-E needs more than +400V to sound right. Most of the amps I'm rebuilding are right around that voltage, and that's one of the reasons I asked about the smaller 6P3S. I did try the 6P3S in a +400V amplifier several years ago, and I saw the red plating that Steve O mentions below. That particular amplifier was originally equipped with US 6L6GCs, but it ran them at +400V, well under their spec. That's the reason I thought the 6P3S might be OK. I don't remember the anode current now, but even at 35mA each, they'd be operating at much less than the common online spec of 20W dissipation.

Maybe the 6P3S needs to be limited to dissipation below 15W or so in order to keep the plates from showing color. If that's correct, it might be a better candidate for amplifiers using +350V or less. In fact, I've wondered if it would be useful as a high quality 6V6 substitute, and it's interesting to hear that you've tried that with good results. I do have several 6V6 amps to rebuild, and a larger filament transformer would be an easy addition. That type of modification is certainly less expensive than buying quads of NOS or upper-end 6V6 reissues.