I have a question..maybe dump, but I don't know the answer.
Just finished a YC156 amp .all working well.
I was surprised to have to re-tune the input circuit to such an extend
that I had to open up and re-size the coils (Single band 6m amp).
Input tuning was done after 6 mins heater warm up with an MFJ analyser, but
no HV. Soon as I applied the HV the input SWR shot from 1.0 to 3.0. This
would vary slightly between 4kv and 5kv.
Why would the i/p swr change so much once HV was applied? ..and then change
slightly dependant on how much HV?
Looking forward to any replies.
73 Neil G0JHC
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