I would not opt for putting anything on the plates. I would prefer to
polish the plates.
In the case of most of Tentec variables they can be disassembled. From
there some XXXX steel wool or jewelers rouge will polish the offended plate.
A Dremel is a big assist in polishing as well. If one can't get jewelers
rouge then use cheap tooth paste. The cavity prevention kind doesn't have
enough pumice however.
73
Bob, K4TAX
----- Original Message -----
From: "Hank P" <pfizenmayer@q.com>
To: <TenTec@contesting.com>
Sent: Sunday, May 11, 2014 4:20 PM
Subject: [TenTec] [Ten Tec} Centurion loading cap
If you reduce the air gap even with “insulation” the breakdown voltage
goes DOWN not up. Now sometimes , if the air gap is sufficient , the
“insulation” will modify the field of a sharp point or rough areas on a
surface enough to keep it from breaking down – but it’s the field
modification – not the “insulation” .
Don’t feel bad , others had not thought about that either - years ago –
on a military project – an air variable we had was arcing , and the
capacitor vendor said he had the solution , he made us a special by
putting teflon coating on the rotor and stator plates – it broke down at
a lower voltage than before !!!!! After the fact it was obvious – but we
all suckered ourselves in .
But having said all that some Glyptal or about anything that will smooth
that area – cover any sharp points and not decrease the air gap too much
may just work.
My recollection of that cap is it is made by TT or someone for them with
spacers and plates all bolted together – you might be able to get a new
plate/plates – or if you tore it apart you might be able to get the area
very smooth . If it is out near the edge you could just remove that area
completely and smooth off the cut edge .
73 Hank K7HP
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