[R-390] Re: 6C4? 6C4W? 6C4WA?

[Barry Hauser]

Tim wrote:

> I believe that argument is most often invoked for the 6BA6W/5749 in the 
> PTO.

Yup -- you're right -- that's probably what I was thinking of.

> There the argument is that constant emission/mu there is most relevant
> for long term stability, with some hints that "hot" high emission/high
> gain tubes may actually be more likely to have their gain depend on
> other voltages/circuit elements/have their gain change more rapidly
> over time as the tube breaks in.

<snipped>

Sounds reasonable and familiar.

Barry