Re: [Amps] Urgent help needed, pse. My 91b is scared of contests.

[Dudley Hurry <jhurry@austin.rr.com>]

Or shorted tube.   Try different band, but I bet there is a bad tube.

73's,
Dudley
WA5QPZ


At 03:56 AM 10/29/2004 -0700, you wrote:

> On Oct 29, 2004, at 2:53 AM, Robert Thain wrote:
>
> > Hi,
> > This is the third contest that my 91b has failed even
> > before the start.  Its works ok at other times.
> >
> > I installed my 91b at the contest site, (where it has
> > worked before). But it goes to 'Fault' straight away.
> >
> > My patch leads and dummy load are tested and fine. I
> > do not believe there is RF getting in.
> >
> > Tuning in to a dummy load with 9.5W in nothing happens
> > then at 10w it goes straight to fault and locks out.
> > In an instant the TUNE indicator shoot hard over the
> > the right just before defaulting to Fault.
> >
> > I do not know if its my imagination but i get an idea
> > of a smell of O-zone (arcing) from the 'band select
> > switch'/'tune up' area. But this might be just my
> > imagination playing tricks.
>
> Robert -- I would high-pot test the tubes to make sure there isn't a 
> concealed  problem.  Also, a 3 - 5 foot plastic tube, with one end held to 
> one's ear, makes a good sonic direction finder.  If you find that the 
> arcing is coming from the 10m or 15m L contact on the bandswitch, there 
> may be an intermittent parasite.
> > Please help
> >
> > Thanks
> > Robert G0HGW
> >
> > Send instant messages to your online friends http://uk.messenger.yahoo.com
> > _______________________________________________
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>
> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>
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