[AMRadio] Testing tubes

[Larry Szendrei]

Bill sez:
> All tubes tend to loose high frequency tone with age. Kind of a softening of
> the high frq. response. But will still test good in a
> standard tester that uses line frq.as a signal source.
> The exception is the Weston testers which use an internal
> osc. at 5 khz which gives a more realistic test of the sound of
> the tube.

and Larry respecfully sez:
I have a heard time swallowing this one. If tubes lose gain at the
higher audio feqs. with age, it then follows they'll stop amplifying RF
a heck of a lot sooner. I've never observed either phenomenon. 

But I'd be happy to be proven wrong with some hard data. :>)

-Larry/NE1S