The PX25 have some other characteristics than 300B. Higher rp and amplification. I think you should use another OPT for PX25 than 300B. I am doing a class A PX25 (KR-Audio with Pa=30W) PP for the moment, my calculations tells me that a Raa of 10k is what I am looking for.
Jan E Veiset
An externally hosted image should be here but it was not working when we last tested it.
Jan E Veiset
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