[Amps] GS35b FWB issue

[Bill Fuqua]

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 at uky.edu>
>To: "Steve" <g8gsq72 at gmail.com>; <amps at 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
> >
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