Re: HV regulation.
I have one of these Andy. Its from Rainer zur Linde. its a stereo version with a common bridge rect ( not fitted) delivers 50 mA each channel.
I made a few of these up and they work well. I have spares if you want one.
Input on the left. two outputs on the right. In the picture you can half see a couple of resistors across the output, they are to float the heaters above ground.
Joe
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