Electronics > Projects, Designs, and Technical Stuff
Planning to build benchtop 500V tube PSU, help needed.
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001:

--- Quote from: H713 on June 07, 2019, 06:25:37 am ---  and a lot of the parts in that power supply are slightly odd choices and look suspiciously like they were originally specced for other equipment. 

--- End quote ---


never heard of special " benchtop 500V tube PSU" parts  :-DD :-DD :-DD :-DD
samofab:
There are tubes that are specifically marketed for use in series regulator circuit. e.g. 8068
David Hess:

--- Quote from: samofab on June 08, 2019, 07:23:31 pm ---There are tubes that are specifically marketed for use in series regulator circuit. e.g. 8068
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What makes them specifically suitable for series pass elements?

I seem to recall that these tubes had unusually low anode resistance and would operate at low anode voltages but I do not remember how this was achieved.
samofab:

--- Quote from: David Hess on June 08, 2019, 08:21:20 pm ---
What makes them specifically suitable for series pass elements?

I seem to recall that these tubes had unusually low anode resistance and would operate at low anode voltages but I do not remember how this was achieved.

--- End quote ---

I don't really know and the datasheet is quite sparse (at least for me). I always assumed that intended use is just a marketing term . Perhaps this particular tube could be used in audio amplifier just as well (e.g. for electrostatic speakers).
Circlotron:
Such a tube might have an unusually low voltage drop, just the ticket for series pass regulator duty, but the construction techniques used to get this low voltage drop might also make the grid volts vs anode current quite nonlinear and therefore not suitable as a normal grounded cathode amplifier. Similar to bipolar transistors - some are optimised for linearity, some are optimised for switching usage.
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