"In a Scott amplifier, they work for a short time (<5 minutes), and then develop severe oscillations, at a frequency of 3000 Hz. The tube basically falls apart in Scott application. Don't buy Sovtek 7199's, they suck."
"Craig likes to copy my replies from years ago. My reply was directed to one individual, and the opinion of others was that the 7199 tube was no good. Of course, that isn't true. This person bought two new 7199's before he knew about the 6U8 conversion, I merely was trying to state that 7199's are good tubes."
Whatever you say, if anyone can every figure out what you are saying.
Looks like plenty of people have no trouble with them, looks like they are lasting longer than 5 minutes.
Fisher guy has lots of Scott gear rebuilt by Mr. Contradiction. A contradiction in itself.