Thanks to everyone for all of the suggestions. I put both tubes back in the
sockets and hooked up the anode connector to only one tube at a time. The
first tube is fine, but when I connected the second tube (first tube now
unconnected), the fuses blew promptly. It seems the mystery is solved.
I've already tracked down a new pair of 3-500Z's at a good price and they
should arrive sometime late next week.
Thanks again for all of the really helpful ideas.
73,
Clay W7CE
----- Original Message -----
From: <gdaught6@stanford.edu>
To: <amps@contesting.com>
Sent: Sunday, December 05, 2004 6:10 PM
Subject: Re: [Amps] TL-922A - Loud Pop, Blown Fuses
> On 5 Dec 2004 at 18:03, Clay Curtiss W7CE wrote:
>
> > Hi Rich,
> > I didn't remove the tubes, but I did remove the anode connection to
> > both of them for the quick HV test. The fuses don't blow when the
> > anodes aren't connected.
> >
> > I figured the sound wasn't inside the tube for the reason you mention.
> > Any idea what could be causing the loud pop? The first time I heard
> > it, I figured it was the spark gap on the T/R relay, but after
> > thinking about it that doesn't make sense since I wasn't transmitting
> > and the amp was in standby.
>
> I'll respond to this via reflector; I've already posted to Clay.
>
> I repaired an LK-550 (three 3-500z's) that sounded like a .22 caliber
> going off. It was the fuses. I removed all 3 tubes, and put them
> back, one at a time, trying each socket. I found two tubes that were
> fine in any socket, and one tube that ate fuses. In fact, sometimes
> the fuses exploded... literally... like blown to smithereens.
> Replaced the bad tube, and everything was fine.
>
> 73,
>
> George T. Daughters, K6GT
>
>
>
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