Ultra-low Noise Valve Regulated PSU. How to? - diyAudio
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Old 1st October 2010, 03:20 AM   #1
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Default Ultra-low Noise Valve Regulated PSU. How to?

Wanna build a MM amplifier? What troulbes me now is that most sources indicate that a valve regulated PSU will not perform as well as a solid state regulated PSU, in particular the noise level.

But in history, valve regulated PSU has been extensively used in various applications, including those high-precision instrumentation that demends ultra-low noise level?

So is there any professional article that covers this issue, i.e. how to build ultra-low noise valve regulated PSU, the know-hows, the noteworthy technical parameters, and the enabiling methods, such as tube selection, sheilding, chasis layout, wiring, etc.

Can anybody offer help to provide this kind of references? Thanks in advance.
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Old 1st October 2010, 06:51 AM   #2
kmtang is offline kmtang  Canada
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The HP 400D audio volt meter and the HP435C microwave volt meter have a very well designed tube regulated power supply built in.

Check them out.


Johnny
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Old 1st October 2010, 08:52 AM   #3
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Janneman has the solution.
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Old 1st October 2010, 09:03 AM   #4
SY is offline SY  United States
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Quote:
But in history, valve regulated PSU has been extensively used in various applications, including those high-precision instrumentation that demends ultra-low noise level?
In those applications, the signal circuits are designed to have high power supply rejection. Did you know that the original application of the topology that John Broskie markets as Aikido was for DC amplifiers, to accommodate poor heater supply regulation?

Jan's design is excellent and I'm using it in my next power amp, but if you're a tube purist, it won't do- the error amplifiers are solid state. I think Kevin Kennedy has posted his all-tube reg; I'd look at that. Also, since old Tektronix schematics are easy to come by, you might copy some of their old regs. But SS is still the performance champion for low noise, low impedance DC.
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Old 1st October 2010, 01:19 PM   #5
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Thanks. Tubes have inherent noises that can hardly be overcome, but my goal is very simple: to find a tube regulated PSU as slient as possible for my preamplifier. It seems that the PSU used in HP instrumentation will satisfy this need.
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Old 1st October 2010, 02:40 PM   #6
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Old 1st October 2010, 04:07 PM   #7
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by Kenneth Zhu View Post
Thanks. Tubes have inherent noises that can hardly be overcome, but my goal is very simple: to find a tube regulated PSU as slient as possible for my preamplifier. It seems that the PSU used in HP instrumentation will satisfy this need.
The HP stuff is well designed, mine was designed expressly for the criteria important in low noise line and phono stage applications. A lot of them have been built by me and others..
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Old 1st October 2010, 06:08 PM   #8
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You can also take power supply schematic from L1-3 or L3-3 Russian vacuum tube tester.
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Old 5th October 2010, 09:26 AM   #9
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Quote:
Originally Posted by Kenneth Zhu View Post
Thanks. Tubes have inherent noises that can hardly be overcome, but my goal is very simple: to find a tube regulated PSU as slient as possible for my preamplifier. It seems that the PSU used in HP instrumentation will satisfy this need.
I don't think it beats this:

jan didden
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Old 5th October 2010, 07:18 PM   #10
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If you want low noise at audio frequencies, why don't you just filter the supply? If you need an accurate DC voltage, make a regulator and put a filter between the regulator and the circuit that needs the low-noise supply.

Most voltage references are pretty noisy: that holds for valve solutions like a neon discharge reference as well as for solid-state versions like a "zener" diode operating in the avalanche region or a band gap reference (noisy because a small VBE difference is multiplied by a large factor). If you want really low noise, usually filtering either the reference or (preferably) the supply voltage is the most practical solution.
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