[Amps] 3XGI7BT modulation problem

[stefano]

I made an HF amplifier with 3 gi7bt triode following the 9m3mr schema in the qro site, the amplifier is working putting out around 1.3kw but I have a distorced modulation an ac hum too, I rececked everithig but seem all ok, any suggestion??

regards

IK5PWL
 
 
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