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Thanks, KM.

I did read a few days again all that you told about the 45 before and have order a two pairs of new (promised) Sylvania from 30s and 40s. From what I tried the Sylvanias never wee bad.  I did not try 50sa or 245, perhaps I will. I am interesting is my specific application – an ability of the tube to push very strong into HF but very clean and very discriminatively. Some of my 2A3 very much punch but they do all HF in the same way. I do not know if it is a sign of coloration or absent of coloration but I like very much what this Philco 45 does – it very high, not thin, not lean and has still where it operate very high some integrity how it show favoritism to tones. It is very much reminds me how my single-state sounded but this time it is a bit more contrasty (thanks for loading). I do not want a tube to be stupidly extended (like Valvos for instance) but I would like it to be “stupidly able to be extended” if it called upon.

Interesting that from RE604 is very extended and superbly clean but the 45has some “Zippines” (positivly speaking) that ads some "excitement". Perhaps it is because my RE604 are used buy my 45 are new? The RE604 run at 36mA but 45s at 41mA. I do not know… Still, the 45 are not expensive and I have plenty of gain to put in there whoever can birth. Oh, if I would not be too lazy I would try my brand new 10Y… BTW, while listening the tubes I do EQ then by gain with .25dB precision, so the gain is not a factor at all that might the a case in a multi-channel installation…

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