[Amps] What tube?

[Manfred Mornhinweg]

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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