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250v Tube Regulated Power Supply - PCB design and schematic

Lately I've been on a linestage kick, and it seems I start every project by designing an appropriate power supply. Most end up in the 200 - 300v range. It seemed to make more sense to develop a small power supply module that could be recycled into each project.

About 2 years ago I purchased a PC board off of Ebay that was a clone of the Marantz 7c linestage portion. While the linestage was reasonable, it contained a really neat regulator circuit based on an obscure 6F3 tube that I've never seen. It turned out that this was similar to the very common ECL85/6GV8 9 pin triode/pentode. Both the ECL85 and it's higher filament voltage cousin the PCL85 are dirt cheap and easy to locate.

I've taken the basic schematic from that regulator, and made some simple changes to allow for a more flexible design. I've been very pleased with the performance on the work bench. It regulates tightly over 0-40ma of current draw.

I've put some documentation about this on my website at the URL below. It's not yet linked to the main page.

I'd appreciate comments on the design and schematic. Also I'm curious if there is enough general interest to justify a run of PC boards.



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Topic - 250v Tube Regulated Power Supply - PCB design and schematic - Gary Kaufman 08:28:31 03/17/04 (15)


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