On Thu, 18 Mar 1999 22:53:37 EST KA2YKC@aol.com writes:
>
>
>
>
>I was testing a Henry 3k Classic which had been sitting idle for a few
>years.
>Amp tuned up fine on 40metrs with the HV in the CW position. In the
>SSB
>position, after keying down just long enough to check the Bird meter,
>the
>built-in pwr switch/breaker would trip. Output was about 1200w for
>75w
>drive. HV was reading 4400v no-load, 4100v key-down, with about 600ma
>on the
>plate current. After the breaker was reset, all was fine again in the
>CW
>position. When we tried the SSB position again, same thing - tripped
>pwr
>breaker switch.
>
>Are 3cx1200's known to go gassy from sitting idle for years at a time
>?
>
NO. What happens if you just run idle current for say 10 minutes? Any
change?
>Visually all looks ok inside. Test was into a dummy load. My only
>guess is
>that the tube is flashing over, or something is going awry. No damage,
>just a
>tripped breaker.
That is not the symptom of a tube arc. Does that amp have a HV glitch
resistor?
>
>Any comments ?
Sounds like a PS problem, something not exactly unheard of with a Henry
amp.
Any way you can put a DC load on the HV; minus the tube?
73 Carl KM1H
>
>Thanks
>Eric
>KK2ED
>
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>
>
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