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Original Message
Re: Pentodes (EL34, EL84, KT88, 6550, etc.) in SE triode mode suck!!
Posted by Scott Thomson on April 17, 2000 at 17:58:25:
Oops forgot to mention the filament voltage was properly adjusted.
Also the 6550 was a cheapy A$25 no-name that came in unlabeled brown cardboard. These regularly develop (or are supplied with) cracks in the glass but seem to retain their vacuum ok.