[R-1051] Fuses

[tim grieco]

Thanks for the tip, I can work on that this weekend and see what happens. It 
seems that LSB tunes much better than USB which may all coralette,
Tim
----- Original Message ----- 
From: "Geoff Fors" <wb6nvh at mbay.net>
To: <r-1051 at mailman.qth.net>
Sent: Monday, February 07, 2005 5:53 PM
Subject: [R-1051] Fuses


>A couple of years back I posted a comment regarding blown fuses on 1051's.
> I have found that sometimes the high voltage terminals of the power
> transformer arc to ground through the rubber seal between the case and
> porcelain insulator.  Apparently the rubber becomes conductive with age 
> due
> to carbon content.  Anyway, the transformer can be repaired by carefully
> crushing the porcelain insulator sleeve, digging out all traces of the
> rubber seal, and creating a new seal and insulator out of good quality 
> epoxy
> such as J-B Weld (pay no attention to the "steel" logo on JB Weld; it 
> hipots
> well past 1 KV!)
>
> This problem sometimes shows up as intermittent fuse blowing, but usually
> once the arc starts it carbonizes the whole seal and creates a constant
> low-resistance short to the case.
>
> Geoff Fors
>
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