Old antares autotune atr 1a unit I have here is really noisy. Anyone have the schematic of this?

[bobsmithtx]

In this stream I am gaining up with a plugin so you can hear the type the noise better (only at the 5 second mark.) this is not my a/c and I am not going mic to line etc... The signal chain is fine with my other gear just this unit being how old it is; it is really noisy.

Any ideas on how I can turn down the noise on the power supply as much a as possible?

 

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