When I was in college, we had a Hunter Bandit 2000C at the W9BGX club
station. It was a kit and I built it.
Check the solder connections where the ends of the filament choke
connect to the terminal lugs. This was a pre-fabricated assembly in the
kit, and after several years we discovered the solder joints had melted
repeatedly resulting in a bunch of classic cold solder joints. After
re-soldering, the amp actually put out more power than it had on day one.
We didn't experience a total filament circuit failure as you have, but
what caused us to look at it was that one of the tubes appeared to have
an open filament. That was another cold solder joint, as the 3-400s had
pins which were soldered to the filament leads from the tube. A little
re-soldering and the tube was good as new.
73,
John, K9MM
amps-request@contesting.com wrote:
> We'll it was fine the day before yesterday, but last night I turned it on
> relays closed on xmit and no output. I looked and found the filaments were
> not glowing so suspect that circuit has an issue.
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