High AC Voltage Between Grounds

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I've built a couple of preamps and amps. The way I do the grounding scheme:

I keep the chassis ground and signal ground separate.

All panels in the metal chassis conduct with each other and I connect a metal tab to a bolt near the IEC and run a short wire to the ground pin.

The RCAs, binding posts, etc. are all insulated and only connected to the signal ground. Signal ground is in a star ground configuration.

Power supply is a very simple design where the transformer has two secondary windings and the center tap is grounded to the star ground (signal).

If I take an Ohm meter and measure AC between let's say one of the RCA connectors (ground) and the chassis, I get anywhere from 25VAC (amplifiers) to 50 VAC (preamps). DC between the two grounds is practically zero.

The systems work perfectly.

Should this cause for a concern? Is it improper to keep the two ground separated?

Thanks for all of the help!
 
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