voltage regulators

[GAK]

Hi

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

Thanks

 

[fdegrove]

Hi,

Any source for tube based voltage regulators?

Shunt or series?

Cheers,

 

[jackinnj]

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]

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]

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

there were also some designs at tubecad

 

[dibbi]

There is a kit available here

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

 

[GAK]

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]

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]

Hi analog_sa

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

 

[jackinnj]

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

 

[marz.tv]

jackinnj, great article. I wish I had that old ARRL handbook, is it available on the net somewhere?
GAK, I'm using the old RCA riaa circuit from the RC-19 tube manual. One low noise 12ax7 per channel. A variation of it (with 12sl7, sn7) can be found on Bob Danielak's site: http://www.geocities.com/bobdanielak/phono.html

 

[GAK]

Hi

jackinnj,very nice article and nice site.
About the ARRL handbook if there's somewhere in the net that can supply it,I want it,too.

marz.tv ,I think Bob Danielak's phono it's pretty good.
Maybe I'll try it.I'd like to see some more schems and choose the best.

 

[jackinnj]

there are ARRL handbooks of this vintage (this one I bought when I was in grade school - 1964 - for $3.50) for sale on EBay all the time.
(there are 47 for sale at the moment.)
You probably want one from the 1960's.

Here's the link:
http://electronics.listings.ebay.co...5050QQsocmdZListingItemListQQsocolumnlayoutZ3