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Old 8th February 2013, 08:06 PM   #11
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Thanks Rod,
Not looking for a design, I was just trying to learn what I could from your perspective. I'm inching towards a shunt reg that will regulate something just under 500VDC and while I have a couple of regultaor tubes that can stand the voltage my inclination is toward a simple transistor circuit if I can arrive at one that results in the sound I'm after. Just fishing for educational thoughts.
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Old 12th February 2013, 05:33 PM   #12
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Quote:
Originally Posted by Rod Coleman View Post
Hi Erik,

Yes. differential bipolar transistor error amplifiers are the way to go.

If the grid current of the pentode is say <10uA, you can run the differential pair at 500uA. This in turn will keep the base current low. The tail can remain a resistor if the -100V is regulated - it will be constant current anyway, and CMR is not a real problem.

As for transistors, please try the excellent NXP PBHV series of 500V parts in SOT23 and 1W SOT223:

PBHV8540Z :: NXP Semiconductors

A "lead" cap can be used from B+ to FB, but it may be necessary to compensate the diff pair with a cap, also.
Hi Rod,

thanks for your advice. I am 'in the field' now (living in Mozambique) and unable to build anything, so for the moment lots of reading, theory, and some exercises in how to tackle a Shunt regulator. But I am quite sure these circuit will be put together when I have access to my stuff again
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Old 12th February 2013, 05:44 PM   #13
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Chokes do matter for tubes. Morgan Jones Valve perfect book for the matter.
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Old 12th February 2013, 06:22 PM   #14
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Quote:
Originally Posted by suntechnik View Post
Chokes do matter for tubes. Morgan Jones Valve perfect book for the matter.
Hi Suntechnik

Are you trying to say that I should use chokes instead of (shunt) regulators?
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Old 9th March 2013, 03:23 PM   #15
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In a bright moment I remembered that one can also drive a pentode (tetrode?) using G2 with G1 and cathode at ground potential. G2 will need a 'power driver' (mosfet), but this will probably allow one to build the shunt element without the need for a negative rail.
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