A question to all those of you who have used many different tubes:
 What tube(s) would you recommend for a legal limit HF amplifier, to get as close 
as possible to the following goals:
 - Class AB2 operation at high efficiency, low idling power, at acceptable IMD 
(doesn't need to be brilliant).
 - Ideally grounded grid triode, but a tetrode with screen supply is acceptable 
if a GG triode won't do it.
- Instant-on filament, or at least quick heating (no more than 10 seconds).
 - Easy cooling requirements, so that a low noise fan or blower can be used. 
Maybe conduction cooled or water cooled.
- Available and reasonably priced.
I know I'm asking to much, but I would like to analize the best options out 
there!
Manfred
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