[Amps] stability of amps

[Tom Rauch]

> Does anyone have the s (or y or z) parameterts of the 572B 
> at frequencies up to 50 MHz and beyond? This would tell 
> you the potential stability.
> My experience with 572Bs  is that they are a real wotsit 
> at 10 metres anyway, and personally,. I'd avoid them like 
> the plague

I would too, but that's because I like to use a tube on a 
frequency where it is very stable and predictable. That 
means well below the self-neutralizing frequency...not 
above.

I once made sweep tubes operate on 6 meters as a bet from 
someone at Amp Supply, and then the things went into 
production!!!

In many cases if we find a lucky recipe it can be repeated. 
That shouldn't be confused with engineering.

73 Tom