[Amps] a BANG in the AMP ?

[rlm]

On Saturday, October 18, 2003, at 04:52  AM, ON4MA Marc wrote:

> When a switched on the commander 2500 a loud bang whas heard somewhere 
> in
> the rfdeck.
> The main fuse from the shack was out !
> I got this amp cheap , look like never used.Before I switched on I did 
> some
> inspection
> inside.No dust ,tubes where in place (2x -3cx800a7) .
> The guy who sold ,told me there was a problem on 10m and 80m .But other
> bands where ok !
> I emailed Pat at commander he told me to look in high voltage board.
> Not so easy because you have to remove the rfdeck.My question is ,wat 
> caused
> the bang ?
> bad tubes ?

•  if the tubes arced internally, there would not have been a bang.

> How could you check the tubes ?

•  I would check them for leakage with a high-potential tester. and I 
would also measure the resistance of each suppressor resistor by 
unsoldering one end.  If a suppressor resistor is way higher in ohms, 
my guess is that the tube took off on its own.

have phun, Marc
>
> 73
> ON4MA Marc
> DXCLUSTER CONCENTRATOR
> visit www.on5oo.com
>
>
>
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/