If the humidity is a bit higher than it should be....it might arc.
If you have air conditioning try turning it on to get rid of the humidity
and see what happens.
I had this very problem with a Collins 30L-1....I could breathe on the
tuning cap and it would arc.
Also....is there any dirt or foreign matter in between the cap blades and
stator?
Some folks allow their pets to sit on top of their equipment and hair etc
can fall in the equipment.
Once I found a staple that was shorting the tuning cap in a non-working amp
I bought for cheap....
73
David Harmon
K6XYZ
Sperry, OK
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Kathy
Bookmiller via Amps
Sent: Saturday, May 16, 2015 1:24 PM
To: amps@contesting.com
Subject: [Amps] Hunter Bandit 2000C, arcing in the tuning cap.
About 6 weeks ago I wrote about some problems I was having resurrecting a
Hunter 2000C.
Colin Lamb came through with the shorting switch I needed, thanks again
Colin. The question of what the meters were ended up being solved, It was a
1ma for plate voltage and current, and a 200mma for watt meter for anyone's
future reference.
Everything is back up and running fine, but for one last problem. As I tune
up, I'm getting some arcing in the tuning capacitor at times.
I've visually inspected it as best I can and can't see any problems, like
bent parts or and differences in the spacing between plates. Obviously I
don't want this to continue before I cause pitting to occur.
I'm wondering if there is still HV insulation spray available. I remember
years ago having a spray can of a red insulation that I used on some big
filter caps that were arching down the ceramic posts and it stopped the
problem. Or should I look for some thin Teflon sheets that could be inserted
somehow between plates to add that needed protection?
Anyone have any ideas what I can do to stop this? Both loading and tuning
use E F Johnson type 154-40 variables, but the problem is happening with the
tuning one, not the loading one.
73,
Kathy
PS It isn't a swr problem as it has happened even with my Cantenna dummy
load.
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