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Old 10th June 2013, 07:23 PM   #1
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Default Can OTL Ciclotron amp use solid state regulated PS?

Is it possible to use a regulated solid state power supply to drive a Ciclotron OTL amp? What would be the pros and cons?
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Old 12th June 2013, 06:01 AM   #2
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Yes. I don't see any reason why not.
What would be the alternative ?
Unregulated ?

I built a circlotron with EL509's having regulated (130 V) screen grid voltages.
I used zeners and NFET's as a regulator.
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Old 12th June 2013, 11:03 AM   #3
12E1 is offline 12E1  United Kingdom
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Quote:
Originally Posted by jfbaquero View Post
Is it possible to use a regulated solid state power supply to drive a Ciclotron OTL amp? What would be the pros and cons?
Don't forget that a regular circlotron has two floating HT supplies for each audio channel. The supplies could be regulated but you'd need four of them for stereo. As Artosalo has mentioned, you could easily use a regulated supply for the bias requirements.
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Old 13th June 2013, 03:06 PM   #4
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Thanks for you answers. I suppose MOSFETs could be used as regulators.
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Old 13th June 2013, 05:02 PM   #5
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Mosfets can be used as regulators.
Below is an example. There are three adjustable regulators. But for circlotron, all must be floating, not having common ground as in this drawing.
The common stabilized reference voltage (about 330 V) is done with two zener diodes D203 and D204. Required output voltage is then adjusted with trimmer resistors P7...P9.
12 V zeners connected between source and gate of each NFET are for protecting purposes, not stabilizing. Practically any NFET having max. operating voltage of 500 V is OK.

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Old 15th June 2013, 04:07 PM   #6
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Artosalo, very interesting design, thanks for information, I would love to use something like this to handle the 6C33C Ciclotron OTL
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