Tube Voltage Regulator, Is it worth the effort? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th October 2009, 06:46 PM   #1
sgerus is offline sgerus  United States
diyAudio Member
 
Join Date: Nov 2005
Location: Milwaukee, WI
Default Tube Voltage Regulator, Is it worth the effort?

Tube Voltage Regulator, Is it worth the effort?
Iíve been experimenting with tube based voltage regulators for my next amp, which will be 2A3 or 300B (switchable) SE stereo amp.
See this link from JC Verdier more details on the tube voltage regulator tech300B
My first impression is itís not worth the effortÖ. But Iím still undecided and looking for feedback.
You will see from the test data below that I never got down to the less than 1R z-out as the JC Verdier article indicatesÖ.
My B+ for the baseline of this test was based on a LC-RC PSU (10H,60uf-200R,100uf)
If I add 200-400uf to the LC stage of this psu I get roughly the same Z-out numbers as with a VReg psu
Could I hear the difference? I canít say because I didnít do a side by side blind test.

Here is the test setup:
The input to the amp is a sine wave at full power, from 20hz to 5Khz
100R in series with the OPT used to measure the AC voltage drop and calculate the AC current
The AC current was very constant from 20hz to 2Khz, at around 40ma
AC voltage measured at the B+ via a 30uf/1M RC filter
Z-out is calculated by = Vac/Iac
The psu for the V-reg test was: 10H,60uf Ė Vreg Ė 100uf
Here are the test results (Z-out in ohms) that compare several LC-RC power supplies to the V-Reg power supply:
The first 4 are normal LC-RC types, then a solid state test just for grins, the 2 examples of tube based voltage regulators, the first using a 5V zenner diode for the voltage reference, the 2nd using a 0C3
PSU Config
#1 10H,60uf-200R,100uf
#2 10H,260uf-200R,100uf
#3 10H,460uf-200r,100uf
#4 LM317 (ss) V-reg
#5 6AS7,6SG7,5V zenner
#6 6AS7,6SG7,0C3

20hz 50hz 100hz 200hz 500hz 1Khz 2Khz 5Khz
#1 50.0 29.5 15.6 8.0 3.1 1.5 .96 .84
#2 18.3 9.75 5.11 2.47 1.0 .52 .31 .18
#3 11.2 5.75 2.82 1.44 .58 .31 .18 .12
#4 45 19 10 6 4.2 3.4 3.3 3.3
#5 23.9 18.5 12.8 7.4 3.1 1.4 .57 .15
#6 19.2 14.5 11.8 8.7 3.1 1.3 .51 .21
  Reply With Quote
Old 19th October 2009, 10:22 PM   #2
Gordy is offline Gordy  United Kingdom
diyAudio Member
 
Join Date: Nov 2006
That's interesting.

I find that most folks who swear by tube regulated power supplies actually do it for reasons of tradition and sentiment (i.e. psychological bias) rather than for actual / pragmatic reasons. Personally I have had fine results using solid state regulation based on the Maida (augmented 3-terminal device) regulators. I have not measured the output impedance though.

Jan Didden (who usually hangs out in the Solid State and Power Supply areas of the forum) recently authored an interesting article in Elektor magazine that combined a solid state error amp and vacuum tube pass element. It has a sub 0.5 Ohm impedance across the audio band. (Elektor March 09, page 22, "T-Reg".)
  Reply With Quote
Old 19th October 2009, 10:52 PM   #3
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
Still, I like them.

If we were interested in perfection though, we wouldn't be using tubes at all for anything

Cheers!
  Reply With Quote
Old 19th October 2009, 10:56 PM   #4
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by Gordy View Post
[snip]Jan Didden (who usually hangs out in the Solid State and Power Supply areas of the forum) recently authored an interesting article in Elektor magazine that combined a solid state error amp and vacuum tube pass element. It has a sub 0.5 Ohm impedance across the audio band. (Elektor March 09, page 22, "T-Reg".)
Actually, it's sub-100 milliohms Zout and sub-300 uV hum/noise

http://www.linearaudio.nl/t-reg-1.htm

jd
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 19th October 2009, 11:33 PM   #5
Gordy is offline Gordy  United Kingdom
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by Geek View Post
Still, I like them.

If we were interested in perfection though, we wouldn't be using tubes at all for anything

Cheers!
"And they look really nice"

: )
  Reply With Quote
Old 20th October 2009, 12:37 AM   #6
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
Are there famous commercial high end tube power amps with stabilized power supply for the B+? I have not seen them yet. If it is more superior, there should be some out there.

Please correct me if I am wrong. In fact, I really like to try but I still have not got the chance yet.

Johnny
  Reply With Quote
Old 20th October 2009, 12:44 AM   #7
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao
[QUOTE=janneman;1954592]Actually, it's sub-100 milliohms Zout and sub-300 uV hum/noise

http://www.linearaudio.nl/t-reg-1.htm

ok! thank ! I change tube 6080 by 6H13??? what do you thinK???
thank,
  Reply With Quote
Old 20th October 2009, 01:15 AM   #8
sgerus is offline sgerus  United States
diyAudio Member
 
Join Date: Nov 2005
Location: Milwaukee, WI
Quote:
Originally Posted by kmtang View Post
Are there famous commercial high end tube power amps with stabilized power supply for the B+? I have not seen them yet.
Check out this link.... this is what got me started on the Tube Based V regulator test.

Triode Spirit

Last edited by sgerus; 20th October 2009 at 01:17 AM.
  Reply With Quote
Old 20th October 2009, 01:24 AM   #9
GK is offline GK  Australia
Account disabled at member's request
 
Join Date: Jan 2006
For a lot of audio applications (especially tube) an ultra low output impedance isnít of much significance. A linear regulator is an inefficient, but extravagant means of eliminating hum.
  Reply With Quote
Old 20th October 2009, 01:28 AM   #10
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
[QUOTE=quanghao;1954672]
Quote:
Originally Posted by janneman View Post
Actually, it's sub-100 milliohms Zout and sub-300 uV hum/noise

http://www.linearaudio.nl/t-reg-1.htm

ok! thank ! I change tube 6080 by 6H13??? what do you thinK???
thank,
That'll work fine, looking at the specs. I haven't checked the pin-out though, so that's something you'd need to verify.

jd
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yamaha CDC-615, Worth the effort? OzMikeH Digital Source 2 4th April 2007 01:49 AM
Would this be worth the effort? needtubes Pass Labs 4 22nd November 2005 06:22 PM
AT1100 arm worth the effort? tubenut Analogue Source 8 5th November 2005 10:42 PM
Is it worth the effort? reticent67 Car Audio 10 6th July 2004 04:53 AM
Is this mod worth the effort? clevegilbert Tubes / Valves 2 27th January 2004 01:23 PM


New To Site? Need Help?

All times are GMT. The time now is 08:13 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2