A few weeks ago I was in the heat of the battle in an RTTY contest when
there was a giant flash and some arcing. On the way to turning my SB220
off, I noticed that the power output was north of 1400 watts and perhaps
I had changed bands without retuning. No matter....
I opened up the amp and found that the Tune variable capacitor was
damaged from the arcing. What didn't surprise me was that the plates
looked like they had been filed down prior to my buying the amp. So,
time for a new cap.
From browsing the Internet I see that Heath came out with a replacement
cap that was heavier duty. This cap is available from RF Parts. But
comments on the Internet say that installing the heavier cap just
transferred the arcing to the bandswitch.
Does anyone have any comments on this? Is it worthwhile to get the
replacement cap? Are there any steps that can be taken to protect the
bandswitch with the new cap?
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