[Amps] TL-922A - Loud Pop, Blown Fuses

[R.Measures]

On Dec 5, 2004, at 6:10 PM, gdaught6 at stanford.edu wrote:

> 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.

Hello, George -- Was the anode bent and touching the grounded grid?

> 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