Variable power supply for tube amps - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 1st May 2016, 07:14 PM   #1
diyAudio Member
 
Join Date: Dec 2011
Default Variable power supply for tube amps

Hi,


I like to design a tube amps for guitar and bass, I need build a variable power supply to work with my prototypes.

Someone had a schematic o recommendation?

I hope that I don't repeat a thread, but I don't find one about this question.

thanks for all replies
  Reply With Quote
Old 1st May 2016, 08:25 PM   #2
diyAudio Moderator
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
Search for variable HV supply in the Tubes forum and you will see quite a few threads.
  Reply With Quote
Old 1st May 2016, 08:33 PM   #3
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
This is a floating variable hv regulator from the new "Art of Electronics" -- the 500k potentiometer controls the voltage from 1 to 450V
Attached Images
File Type: png HV_LT3080_Regulator.png (36.9 KB, 137 views)
__________________
Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?
  Reply With Quote
Old 1st May 2016, 09:43 PM   #4
diyAudio Member
 
Join Date: Dec 2011
Hi

ok , i will make a new research, i didn't use the right words.

thanks for the schema jackinnj,

i have a question, can i use a electrophoresis power supply or this isn't advisable?
  Reply With Quote
Old 1st May 2016, 11:11 PM   #5
JMFahey is offline JMFahey  Argentina
diyAudio Member
 
JMFahey's Avatar
 
Join Date: Mar 2009
Location: Buenos Aires - Argentina
Quote:
Originally Posted by morelius View Post
i have a question, can i use a electrophoresis power supply or this isn't advisable?
* YES
* NO
* MAYBE
* YES BUT .....
* NOT IN YOUR DREAMS

pick one.

Now for a real answer, you tell us what an electrophoresis power supply is, specially what voltage/current it can supply.
__________________
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
  Reply With Quote
Old 2nd May 2016, 08:01 AM   #6
diyAudio Member
 
Join Date: Dec 2011
Hi,

yes, I must say the specifications

I need a variable 600v - 200mA HV supply.

I was reading a thread about this, but all models are too old or only in USA. Also, I see that some electrophoresis supply doesn't work properly (spikes, etc...).

I can build a power supply, but I don't know any project of any schematic.
  Reply With Quote
Old 2nd May 2016, 08:08 AM   #7
diyAudio Moderator
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
You can make a very simple and useful HV supply with just a variac, an industrial PT (say 230V to 480V), a bridge rectifier and some filter caps. You don't really need a regulated PS for testing guitar amps...
  Reply With Quote
Old 2nd May 2016, 10:34 AM   #8
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Build a PSU with two sections fed from one secondary: cap input (DC out ~1.4 x secondary AC RMS), and choke input (DC out ~0.9 x secondary AC RMS). That gives you two voltage rails. I did this and have approx 200V and approx 300V to play with. You don't need more accuracy than that for playing with valve amps.

Regulated supplies are more difficult to design and build than audio amplifiers! And they introduce complications like reactive output impedance which can mess up the amplifier you are working on.
  Reply With Quote
Old 2nd May 2016, 03:23 PM   #9
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
I posted the design using an LT3080 because it's very straightforward and can be built with a minimum of expense. (The LT3080 is $4.40, a 2W 500k pot around $11). You'd probably want to insulate the shaft of the potentiometer.

A bode plot via LTSpice would be a helpful sanity check.

I use a Variac as jazbo8 suggests, but Variacs are pretty expensive outside the US. The great thing about a Variac is that you're not burning a lot of energy in the pass element.
__________________
Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?
  Reply With Quote
Old 2nd May 2016, 11:05 PM   #10
diyAudio Member
 
Join Date: Dec 2011
Thanks all people for the replies,

I'm newbie and i need a recomendation for variac please. I don't find any variac whit 450 to 600V output.
  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
Simple Variable Tube Power Supply Sal Brisindi Tubes / Valves 18 3rd October 2016 11:02 AM
Variable Power Supply Bibio Power Supplies 4 16th October 2015 05:17 PM
Building A Really BIG Variable Tube Power Supply. kimbal Equipment & Tools 3 26th October 2013 11:12 AM
12 volt power supply for tube amps caraudionut Tubes / Valves 9 27th April 2007 04:04 PM
Digital Variable Power Supply jleaman Digital Source 13 13th April 2004 11:09 PM


New To Site? Need Help?

All times are GMT. The time now is 02:06 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki