Good question Jim. The two Henry amps I repaired BOTH had shorted xmfr
windings. This was quite some years ago when I was still a electronics
tech for the Navy (now an emergency room nurse with an affinity for
telemetry gear, hhhmmmm). If I recall it was the secondary windings on
both, of course 100% confirmation achieved with resistance readings with
them completely out of circuit. They were both ECA and in my opinion
were not of high quality what so ever. My reference for quality at that
time though was Navy radar and communication xmtrs and Dahl xmfrs so
possibly not a fair quality comparison.
Lane
Ku7i
USS Peleliu
LHA-5
currently at sea
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of Jim Thomson
Sent: Sunday, March 21, 2010 9:20 PM
To: amps@contesting.com
Subject: [Amps] 2A slo blow in step start
From: "Zeitler, Lane LT, FST-1" <zeitlel@cpr3.navy.mil>
Subject: Re: [Amps] 91B problem in Paraguay
In the past when I have had similar symptoms it was the plate xmfr
shorted. Both of these instances were Henry desktop amps, one a 1KD-5
and the other a 2KD-5. You need to start unloading, ie, unload the
secondary of the plate xmfr and see if it still blows fuses.
Lane
Ku7i
### Was the FWB rectifier assy shorted.. or just the plate xfmr
pri/sec ? A shorted fwb would lay a dead short across the sec of
the plate xfmr. If the xfmr was actually shorted, this makes henry
radio plate xmfr
horror story #38 and #39. Henry radio has gone through at least 4-5
plate xfmr manufacturer's I know of. They dumped ECA on the 8 k
ultra... and went to someone else... then the 8 k was discontinued.
Subject: [Amps] 91B problem in Paraguay
Turned on my hosts amp this morning and tripped the 2amp slow-blow
fuse...Got more fuses this afternoon and same thing keeps happening.
?
Seemed to shut down normally althought there may have been a problem
with a sticky T/R relay before turning off the amp.
?
Any ideas what could be causing the 2 amp fuses to blow when turning on
the switch?
## The 2 A slo blow is part of the step start circuitry. If their is
a short in the sec, or fwb, etc, the 2A fuse will blow. If the step
start resistor opened up, and the wide open resistor was shorted, the
2A fuse would
also blow.
Later... Jim VE7RF
?
Thanks
?
Dale ZP6/N3BNA
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