Thyratron voltage regulation - 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 2nd March 2007, 09:02 AM   #1
diyAudio Member
 
rcavictim's Avatar
 
Join Date: Jun 2004
Location: Next to an open wormhole NW of Toronto
Default Thyratron voltage regulation

The requirement of how to best regulate the B+ voltage in a tube amp power supply is often dealt with by the use of either a pass regulator in series with the unregulated power supply and the amplifier circuit, or a shunt regulator, or a simple choke input filter.

I have observed that the use of mercury vapor rectifier tubes like the 866A is popular with some builders because of the attractive blue glow.

It has occured to me that one could combine the glow of Hg rectifiers with the functionality of Hg or Gas filled thyratron tubes to take care of both rectification function as well as voltage regulation of the power supply. Such a scheme used to be standard fare in industrial power electronics but I have never yet seen a tube amplifier builder employ this technique.

What you do is make a bridge rectifier using two Hg rectifier tubes and two Hg or gas filled (like Hydrogen) thyratrons. You need to fire the thyratrons into conduction at the correct phase angle of the incoming AC mains waveform each cycle depending on how much charge you need to send to the supply filter/reservoir. The technique is exactly the same as a typical SCR light dimmer control.

I got thinking about this because I have a box of suitable thyratrons that are in similar size and power league to the 866A.

Comments?
__________________
On April 01,2012, my radioastronomy Project TARGET SETI search succeeded. The signal came via extradimensional subspace, not radio waves. I now get a lot of 'visitors'. I took my avatar pic of one friend watching me in my work yard from just 20 ft. away.
  Reply With Quote
Old 2nd March 2007, 09:06 AM   #2
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
I once owned a tyratron... very nice looking and big
Attached Images
File Type: jpg tube_front.jpg (50.2 KB, 196 views)
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  Reply With Quote
Old 2nd March 2007, 09:25 AM   #3
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Default Re: Thyratron voltage regulation

Quote:
Originally posted by rcavictim
The technique is exactly the same as a typical SCR light dimmer control.
Which means that you can expect to have to deal with similar RF and mains-borne noise problems. Having said that, the range of conduction angles would not be as great, so the problem shouldn't be nearly as severe.
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  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
Voltage regulation for TL494? thunderpld Power Supplies 0 14th March 2009 10:28 PM
OD3/OA3 voltage regulation design Carlp Tubes / Valves 1 21st February 2008 05:57 AM
voltage regulation for input buffer in UcD zilog Class D 3 16th October 2006 04:48 PM
Voltage Regulation from a battery bigphil Power Supplies 9 14th October 2006 03:44 PM
Do I really need voltage regulation on such a small current? Sunsun22 Power Supplies 9 13th October 2006 08:23 PM


New To Site? Need Help?

All times are GMT. The time now is 11:53 PM.


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