[TenTec] Centurion 422B

[CSM(r) Gary Huber]

I've seen 8873s (external anode triodes) in the Dentron MLA-2500 arc across 
the base insulation from dust on the cooling fan side. A good scrub with 
alcohol to remove the carbon track usually was good for several hundred 
hours...

73,

Gary - AB9M
--------------------------------------------------
From: "Stuart Rohre" <rohre at arlut.utexas.edu>
Sent: Wednesday, June 09, 2010 2:39 PM
To: <tentec at contesting.com>
Subject: Re: [TenTec] Centurion 422B

> I once had a low powered rig that developed such an arc over in standby,
> and it turned out to be a burned out place in the potting of the high
> voltage transformer winding.  It would arc to the metal can in which the
> transformer was potted.  A cure suggested was to heat up the transformer
> (removed from rig) on a hot plate to remelt the tar and then to test for
> the fix.
>
> But, usually, this symptom is dust accumulation within a linear upon
> various insulated parts.
>
> -Stuart Rohre
> K5KVH
>
>
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