On Dec 5, 2004, at 6:32 PM, Clay Curtiss W7CE wrote:
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.
Was the connected tube in the inboard socket?
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.
Would you sell me the old tubes?
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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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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