Your hum is coming from the SECONDARY of the transformer. See K7RDX
response. He is absolutely correct
Norm N8NH
At 01:29 PM 11/10/2008, Bob Gibson wrote:
>Hi..I have built a YC156 amp and I have a problem with hum in the
>audio..I key the radio in SSB with the amp in line but not keyed and
>I get this hum and its coming from the filament transformer..I
>opened it up and disconnected the filament transformer then again
>keyed and no hum..I have tried grounding all kinds of ways and still
>hum..Would some beads help out? Thanks Bob W5RG
>
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