Finals going bad in Heathkit SB-401 transmitter?
David wrote:
I have a Heathkit SB-401 transmitter I refurbished a few years back
that exhibits a couple of peculiarities during tune-up:
1) First, on 80 meters (and only 80 meters) when I tune the final
amp’s plate circuit, the plate current dip point does not correspond
to maximum output.
Check the neutralization of the finals.
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