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In the Forum: Melquiades Amplifier
In the Thread: Bias help
Post Subject: Service power supplyPosted by Romy the Cat on: 5/22/2013
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DA,

I would not use any switched power supply, not to mention that they do not need to be regulated for LEDs, relays and fans. I do not know if you build a full range Milq or more complicated multi-channel version. If it is a full range Milq with only one 6C33C then you truly do not need any fan. I have build-in fan in my full range Milq but I decided do not use it as it was not needed.

Fans can take surprisingly nigh current but if you have DC need only for LEDs and relays then you need super low power PF and it might be anything. You might take a parallel ran from filament and dump it to separate rectifier and filter. It would be under 1 dollar type PS and it will serve you well. All that you would need to do in future what the amp is running to confirm that it will be no auditable impact to the filaments. I do not think it will be but you never know.

The right way to do it, in my view, would be how I did it in my 6-ch Milquades. I have a separate transformer with separate rectifier and filter that serve only 12VDC that I need for all auxiliary service functionality. The right question would be to ask if my 12V DC auxiliary service power share the common ground with the rest amp. Honesty, I do not remember and I do not know as now what would be the right answer. Theoretically the service power might be completely floated as none of the service element has references to gourd. From another perspective anything floated is king of non-kosher and you might try to bias that service power relative to the common ground but running a resistor between minus of service power supply and common ground. I do not think that you will see any snick difference but you might see some noise differences, in particularly if you run service power wires in the amplifier negligently,

Rgs,
The Cat

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