On my SB-200, the front circuit breaker trips after half hour or so of
operation on RTTY. If running RTTY, I usually keep it down to 200-250
watts. It is the same breaker, the front one, that always trips. After it
cools down a bit, it will come back on. The plate current is only running
about 300 ma or so.
The tubes are fairly new (4 months) and don't run red when operating RTTY at
200-250 watts. I also have some muffin fans on top with the lid open to
take out some of the heat.
In looking at the schematic, the breakers are in the primary of the power
transformer. What causes them to trip, heat? There doesn't seem to be that
much with the extra fans on top. 73 and thanks
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