----- Original Message -----
From: Jon Ogden <jono@enteract.com>
:
>
> > The amplifier was in STANDBY ..... NOT KEYED .... but with all voltages
ON !
> > I had a reason to remove the top cover (high voltage interlock removed),
I
> > slowly raised the cover from the front of the amplifier leaving the rear
of
> > the cover sitting on the amplifier ... when I got the front of the cover
> > raised about 3 inches ... all of a sudden the amp made this huge big
grunt
> > and the circuit breaker tripped off. After I removed the top cover and
>
> What happened is that you changed something in your circuit. Yes! The
> cabinet of the amp is part of the circuit. Some sort of resonance was
> created by lifting the cover and hence your oscillation. But the boundary
> conditions of the problem were changed. So you can't say that Tom's claim
> is wrong. Those tubes would not have experienced oscillation had you left
> the cover down. But having them keyed and moving the cover caused things
to
> change inside and BOOM!
Jon .... look at what you just said .... quote "But having them keyed and
moving ...." Now look at the first line of my description of what happened
....
"The amplifier was in STANDBY ..... NOT KEYED .... "
Terry W6RU
>
> It was not a static state that caused your oscillations.
>
> 73,
>
> Jon
> KE9NA
>
> -------------------------------------
> Jon Ogden
> KE9NA
>
> Member: ARRL, AMSAT, DXCC, NRA
>
> http://www.qsl.net/ke9na
>
> "A life lived in fear is a life half lived."
>
>
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