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HK6500 weird grounding issue


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Hi,

got a problem with my amp, recently completely restored.

There is a hum if no inputs are connected, if i short them, the hum goes away. If i connect a source, the hum becomes very quiet.

I run just the main amplifier PCB, disconnected all of the other boards like phono or tone.

Chassis is grounded (continuity checked).

Anyone got any ideas what to do?

Thanks

Dave

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