[Amps] SB220 Improvements

[MorgusMagnificen at aol.com]

I just tried to locate an official data sheet for this tube, but I could not 
find one anywhere. However, my Radio Amateur's Handbook lists this tube as 
having an 'operating range' of 110MHZ, which I assume they took from some 
mfrs. data sheet.

Are you claiming that they sell this tube to the user with full knowledge 
that it possesses a very harmful resonance WITHIN its specified operating 
range? Like if FORD sold you an car knowing full well that it possessed an 
(undamped) front end resonance that would be excited at 70MPH?

Eric von Valtier K8LV