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PS Regulation [message #11342] Sun, 30 July 2006 18:08 Go to next message
Manualblock is currently offline  Manualblock
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Illuminati (13th Degree)
Is there anything to be gained by using tube diodes to build a regulation circuit for an SE amp?

Re: PS Regulation [message #11343 is a reply to message #11342] Wed, 02 August 2006 08:06 Go to previous messageGo to next message
Damir is currently offline  Damir
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Registered: May 2009
Illuminati (2nd Degree)
IMO - "classic" (C)LCLC filter after (tube) rectifier has large ripple attenuation and a good regulation, especially that "average" current "draw" from SE amp is a pretty much constant.
The most benefit from regulated supply is probably a very low output impedance (rel. high impedance from "classic" supply has influence on sound and even loss of power - PS imp. is in series with output tube).
But, is this worth the hassle to build the (tube) regulated supply...hmm?!

Re: PS Regulation [message #11344 is a reply to message #11343] Wed, 02 August 2006 10:07 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
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Illuminati (13th Degree)
Thanks Bud.

Re: PS Regulation [message #11345 is a reply to message #11344] Wed, 02 August 2006 14:31 Go to previous messageGo to next message
Damir is currently offline  Damir
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Registered: May 2009
Illuminati (2nd Degree)
Another possible solution is using of BJT or Mosfet transistors in a simple regulator, in fact only a ripple filter/low imp. out device, with small voltage drop through it, say 10-20V.

Re: PS Regulation [message #11346 is a reply to message #11345] Wed, 02 August 2006 17:37 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
There is a good circuit in BASDIY that uses LEDS to do exactly what you say. He uses it in a PP EL 84 amp.

Re: PS Regulation [message #11349 is a reply to message #11346] Tue, 12 September 2006 08:47 Go to previous message
SteveBrown is currently offline  SteveBrown
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Registered: May 2009
Grand Master
My favorite scheme is to use shunt regulation with a CCS on top of gas regulators. This is simple and extremely effective. I try to pass 2 -3 time the circuit current through the shunt. I've had this make a remarkable difference in the bass quality in particular. A shunt would be harder to do in an output stage, but easy in driver and preamp stages. I do bypass the gas tubes with a teflon cap, something around 0.1uf or so seems to do fine.

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