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In Reply to: RE: PX25 max dissipation?? posted by twystd on July 13, 2007 at 14:38:08
Interesting question
There is not many info of these tubes
I play abouth a half year now with these tubes
but i am not shure what the best operation point is
after many try outs i stuck with 390 B+
cathode resistor of 535 ohm and measure 29,8 volt across them
thats around 20 watt.
Tried also 22 watt but find it a litte to hard sound
but i still experimenting.
There is not many advice on the net about this tube
i use them with a 3k5 load and sounds many times better than a 300b
also the load lines that are suplyed with the tubes are not correct
the tubes that i use are very different with a little math i came to a internal resistance of 760ohm and a mu of 3.94 and a steepness of 5,2
I hope that more people give a post on this question
to learn from them
Best regards Robert
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