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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage

Post Subject: DIY FailsafePosted by Paul S on: 10/5/2012

Of course, the object is to be sure you never have a situation where HV is on while heaters are off, whether switching "on" or "off". And the usual DIY way to do this with totally separate PSs is...separate switching. If this or a similar approach is used, I certainly recommend the color-coded pilot lights, all right! Hell, under these conditions, with my ADHD, I'd need some sort of alarm as a backup! Might be a good idea to have the pilot lights even on a fancier, relay circuit, just to be sure everything is functioning as planned, every time.

Another uber-switch approach (that I have not built...) might be staged MOVs in and out, apropos. This would probably still require shunt relay or relays; a LV-triggered relay (from the heaters) for the HV for "on", and a "reverse" HV relay (from the HV shunt...) for the heaters (for "off")...

Best regards,
Paul S

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