73Jazz Posted March 27, 2010 Share Posted March 27, 2010 i recently bought a Fender 300PS from 1977. As told to me, the 6550 run very hot cause there were built for 600V and the Fender runs them at 700V. So, if you are not able to select the best from hundreds of tubes it is better to use KT88. Is that also your oppinion? Which tubes are your choice, which brand?Are there any Fedner 300PS fans here? Quote Link to comment Share on other sites More sharing options...
umph Posted March 27, 2010 Share Posted March 27, 2010 modern 6550's and kt88s are quite similar, personally i'd wack some shuguang or JJ kt88s in there and call it a day. Quote Link to comment Share on other sites More sharing options...
escholl Posted March 27, 2010 Share Posted March 27, 2010 According to the datasheets you are right about the max plate voltage being 600 volts for a 6550, for the KT88 the plate voltage max is 800 volts. If they can be interchanged in the circuit, as they often can be, then I would go for the KT88's. Can't recommend any specific brands though, as I've not much experience there. Quote Link to comment Share on other sites More sharing options...
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