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Old 22nd January 2004, 11:42 PM   #1
GAK is offline GAK
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Default voltage regulators

Hi

Any source for tube based voltage regulators?
I'm planning to build a phono-line stage with a tube voltage regulator.

Thanks
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Old 22nd January 2004, 11:49 PM   #2
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Hi,

Quote:
Any source for tube based voltage regulators?
Shunt or series?

Cheers,
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Old 23rd January 2004, 05:07 AM   #3
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you'll find the old designs in the ARRL Handbook from the 1960's. Email me privately if you want a copy.

You would be much better off using a pair of IRF HexFET's -- unless you like to ke your room warm with tube-based regulators.
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Old 23rd January 2004, 08:22 AM   #4
marz.tv is offline marz.tv  Sweden
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I think is a good idea to keep it all tube. For low current applications, the filamentless 0A2 (150v, Imax 35ma) and 0B2 (108v, same Imax) are easy to start with. And the purple glow is just wonderful! ^^
You can also put them in series for different voltages. They are used as shunt regulators after the B+ is rectified and filtered, with a resistor just before to set the voltage drop (from the current draw of the regulator tube plus the audio circuit).
They need a little higher voltage to 'strike' or start up, 185v for 0A2 and 133v for 0B2, so make sure that the transformer delivers at least this much HV.
What tubes are in your phono amp?
Russ Sadd's homepage is apparently down for now, but I think he used to have a very good walkthrough on regulated tube supplys.
Good luck!
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Old 23rd January 2004, 12:30 PM   #5
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Steve Bench has a tutorial on his site:
members.aol.com/sbench/reg5.html

there were also some designs at tubecad
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Old 23rd January 2004, 12:59 PM   #6
dibbi is offline dibbi  United Kingdom
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There is a kit available here

http://www.transcendentsound.com/tube_power_supply.htm
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Old 24th January 2004, 03:15 PM   #7
GAK is offline GAK
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I have read Steve Bench articles.They're very nice.
Maybe I'll build something from his ideas.
In part 3 has a very good design.
About the tubes in phono I haven't decided yet.
I'm thinking to use ECC82-81 in SRPP configuration.
Two srpp and the riaa filter in the middle.A classic design.
An other idea is with 5692 (if I remember right).
I saw a design in audioXpress magazine.
If anyone has a good schem in mind is acceptable.
The line stage will be with the 12B4A.One triode per channel.I have build it in an experimental mode and I'm listening with it in my system right now and I'm very satisfied.
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Old 24th January 2004, 04:10 PM   #8
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The 12B4 line is a good idea but i am not so sure about the ECC81-82. Never heard commercial or diy phono using these tubes that sounded halfway decent. Even the ECC88 is a better bet.
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Old 24th January 2004, 04:35 PM   #9
GAK is offline GAK
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Hi analog_sa

Which tubes do you suggest is a good idea?
Any good schem?
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Old 24th January 2004, 10:09 PM   #10
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this link to the 1964 article from the ARRL handbook on tube regulation will be up for a couple days, then I will take it down:

http://www.tech-diy.com/tuberegulation.pdf
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