Last week i assembled the kpa500 of oe6rdd
when we transmit we hear a realy loud hum (50hz) in the rythm of the cw signals

i have compared this with my own kpa-500 and there is no hum
i have tried to loosen the big srew which holds the tranformer with no result

any ideas ??

73
Klaus
OE6KYG
KX1 244
K2 1331
K3 115

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