[R-390] Rats - There goes a pair of 26Z5W's

[David Wise]

If one tube decided to short cathode to heater (for
whatever reason), this would ground the other cathode
at the same time, and in seconds both would fuse open
at the thin metal ribbon connecting the cathode sleeve
to the pin.  This will be pretty obvious if you examine
them.

I hope you're keeping a close eye on your radio!

73,
Dave Wise

> From: Bob Camp [mailto:ham at cq.nu]
 
[snip good stuff about cap detonation]


> >> From: Barry [mailto:N4BUQ at aol.com]
> >>
> >> simply been the tube's time to go.  I had inadvertently left
> >> the radio in
> >> STDBY for about an hour and a half while the PTO was warming
> >> up for the test
> >> (meant to switch to AGC but forgot).  Perhaps this placed
> >> some sort of odd
> >> strain on the rectifiers.  I don't know.
> > _____________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/faq.htm
> > Post: mailto:R-390 at mailman.qth.net
> > Unsubscribe: http://mailman.qth.net/mailman/options/r-390
> >
> 
>