[Top] [All Lists]

Re: [Amps] GS35b FWB issue

To: "Bill Fuqua" <>, "Steve" <>, <>
Subject: Re: [Amps] GS35b FWB issue
From: "David H Craig" <>
Reply-to: David H Craig <>
Date: Wed, 13 Jul 2011 13:57:42 -0400
List-post: <">>
    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" <>
To: "Steve" <>; <>
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 mailing list

<Prev in Thread] Current Thread [Next in Thread>