Sounds that you lost a diode string.
Is that a rectifier bridge or a doubler circuit?
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Barrie Smith
Sent: Donnerstag, 20. April 2006 02:52
To: amps@contesting.com
Subject: [Amps] Strange power supply
I recently boxed-in my all-purpose power supply with thin panels of wood, in
order to protect the cats, and run my 432 amp.
Just prior to the box-in, I ran my 8877 6M amp at 4200 volts idle, and 3800
volts at 1 amp load with no problems.
Now, attached to my 432 amp (2 X 3CPX800), running 3000 volts idle, results
in 2000 volts under 1 amp load.
I've run this amp on the same power supply in the past with no problems,
although it's been awhile.
I've taken the panels off, thinking that I've screwed something up, but the
results are the same.
Under a 1 amp load I'm also hearing a (60 cycle?) loud hum, that increases
in volume as the loading is increased. I've never heard the hum in the
past, even when running the 6M 8877 amp at above ratings.
This is not a whimpy power supply. It has a 2 amp, 5000 volt Peter Dahl
transformer, with a 30 amp variac.
Before I start throwing parts all over the room, does anyone have a clue as
to what I may have going on here?
73, Barrie, W7ALW
I've cleaned the step-start relays, which are each 25 amp, and put contact
cleaner on the variac.
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