Hi Folks:
I finally got around to wiring the shack in our new home for 220VAC, and
plugged in my vintage SB220 for 48 hours of CW contesting. After the
step-start circuit disengaged, there was a load pop and flash from the
high voltage section behind the meters. The amp had been off for six
months. I checked the
AC mains, and found 245V! The old QTH had 220-225V ... and the amp had
run flawlessly at this voltage for 15 years. My theory (and I am asking
your opinion) is that the old filter caps probably decided the 10%+ extra
voltage was too much! BTW, the diode board was replaced last year with
one of Harbach's.
Thoughts??
Dennis, K7FL
Battle Ground, WA
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