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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: Right grounding configuration for PS, corrector and transformer assembly.Posted by Romy the Cat on: 4/19/2010
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Alex,
From what you report it looks like it might be the filaments. The 32mV is a bit high for filament ripple, I usually prefer it to be 5mV but 32mV shell not have hum. Do not bring the filaments directly as you did but make it running by tool loops and ONLY by twisted pairs. Disconnect the transformer. Short the input grid and measure the noise at input. You shall have sub 3mV. If you have no noise at outputs then the problem is in the grounds between your corrector and your transformer – a very common problem. The problem that you are experiencing is nominal – you need to find right grounding configuration for your PS, corrector and transformer assembly.
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