The Sylvania 7n7 has caused me to go through another round of tube rolling. Now using the new Tungsol 7581a tubes along with a EH 5u4. Wonder if I could use the 5ar4 instead, the 7581a can take more voltage than a 6l6c.
Also have a technical question. Dennis says the KT88 Firebottle amp has a regulated screen supply. How is it being regulated? It's obviously not a tube regulated system so I assume there is a solid state device being used?I didn't notice any of them in the picture in the manual though it could be hidden I suppose.
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