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In Reply to: RE: VR Tubes posted by Triode_Kingdom on July 11, 2016 at 08:24:46
When they were used, VR tubes were the ONLY way to achieve regulation (in the absolute sense). Compared to zeners, they absolutely suck. The lowest noise way to achieve a high-voltage reference is to put together a string of 5.6 volt zeners to whatever total voltage you need.Except for the nice color, I can see no reason to use VR tubes in a new design.
Edits: 07/11/16Follow Ups:
Zeners are avalanche devices, and thus quite noisy.
Not a problem if you use current-source plate loads.
Hi Lee of Omaha,Better than that, use a TL 430 which is a programmable shunt regulator. They have a rating of about 30 Volts, but you can put them in the cathode circuit of a medium mu triode with the grid grounded and get whatever voltage you need. Chose a mu low enough to get the cathode voltage high enough to operate the TL 430 (~ 3 or 4 Volts should be OK).
By the way I used a TL 430 to regulate the B+ in my Citation 4. I used a photo isolator powered from DC heater supply to couple to the power MOSFET pass device.
Phil
Edits: 07/11/16
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