Happy that you found it.
Sometimes HV gets exciting.
73
Bill wa4lav
At 01:57 PM 7/13/2011 -0400, David H Craig wrote:
> Thanks to all- found the issue(s). 1.) The cap bank, if not breaking
>down from carbon tracing at normal operating voltage, was probably close to
>doing so. 2.) The tranformer is shot- it reads 80k ohm from either primary
>to any of 4 secondary taps, and hipots infinite leakage after a few 100
>volts (no movement at all on the HV meter needle at any voltage level...)
>2nd HV transformer I've lost (1st was in an SB220 I "over-contested" without
>extra air) but never saw one that would "idle" without a load of any sort
>like this. I compared it to an unused Dahl hypersil I have here w/ the same
>secondary rating- it had 7-10 micoramps of leakage at 7kv (wasn't game to
>push it higher). Going to replace the works obviously.
>
> Appreciate all the advice.
> 73 Dave N3DB
>
>
>
>----- Original Message -----
>From: "Bill Fuqua" <wlfuqu00@uky.edu>
>To: "Steve" <g8gsq72@gmail.com>; <amps@contesting.com>
>Sent: Wednesday, July 13, 2011 10:28 AM
>Subject: Re: [Amps] GS35b FWB issue
>
>
> > My first novice transmitter developed a novel problem.
> > When it warmed up the 5U4 would arc over. Turned out that
> > a number of turns in the primary were shorting out causing
> > a sudden jump in the secondary voltage thus the arcing and
> > fuse blowing. Never ever seen this again.
> > 73
> > Bill wa4lav
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
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