voltage regulators

GAK · 22nd January 2004, 10:42 PM

Hi

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

Thanks

fdegrove · 22nd January 2004, 10:49 PM

Hi,

Quote:

Any source for tube based voltage regulators?

Shunt or series?

Cheers,

jackinnj · 23rd January 2004, 04:07 AM

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.

marz.tv · 23rd January 2004, 07:22 AM

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!

jackinnj · 23rd January 2004, 11:30 AM

Steve Bench has a tutorial on his site:
members.aol.com/sbench/reg5.html

there were also some designs at tubecad

dibbi · 23rd January 2004, 11:59 AM

There is a kit available here

http://www.transcendentsound.com/tube_power_supply.htm

GAK · 24th January 2004, 02:15 PM

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.

analog_sa · 24th January 2004, 03:10 PM

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.

GAK · 24th January 2004, 03:35 PM

Hi analog_sa

Which tubes do you suggest is a good idea?
Any good schem?

jackinnj · 24th January 2004, 09:09 PM

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

22nd January 2004, 10:42 PM	#1
GAK diyAudio Member Join Date: Apr 2001 Location: Greece	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 __________________ let's boom chitty boom

24th January 2004, 02:15 PM	#7
GAK diyAudio Member Join Date: Apr 2001 Location: Greece	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. __________________ let's boom chitty boom

24th January 2004, 03:35 PM	#9
GAK diyAudio Member Join Date: Apr 2001 Location: Greece	Hi analog_sa Which tubes do you suggest is a good idea? Any good schem? __________________ let's boom chitty boom

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23rd January 2004, 04:07 AM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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.

23rd January 2004, 07:22 AM	#4
marz.tv diyAudio Member Join Date: Jan 2004 Location: Scandinavia	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!

23rd January 2004, 11:30 AM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Steve Bench has a tutorial on his site: members.aol.com/sbench/reg5.html there were also some designs at tubecad

23rd January 2004, 11:59 AM	#6
dibbi diyAudio Member Join Date: Nov 2003 Location: Leeds	There is a kit available here http://www.transcendentsound.com/tube_power_supply.htm

24th January 2004, 03:10 PM	#8
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	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.

24th January 2004, 09:09 PM	#10
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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