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

[R.Measures <r@somis.org>]

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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