EL84 matched pairs - 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 23rd May 2005, 07:26 AM   #1
Indy335 is offline Indy335  United Kingdom
diyAudio Member
 
Join Date: May 2005
Location: Bristol
Default EL84 matched pairs

I am building a valve amp (not my design) which is supposed to have two sets of matched pairs on the output (EL84's), the application is for a guitar amp, can someone tell me how crucial it is that I make sure I use matched pairs and what the result would be if I didn't? Also are there good cheap modern equivalents of the EL84 available (in U.K.)?

Many thanks for help

Indy
  Reply With Quote
Old 23rd May 2005, 09:25 AM   #2
diyAudio Member
 
audiousername's Avatar
 
Join Date: Jul 2004
Location: Melbourne, Victoria
The EL84 is still in production in Russia and a few other places. If you're looking for rather cheap ones, this may be a start.

How utterly crucial matched sets are will somewhat depend on the bias scheme. Do you have a schematic you can share with us?
__________________
Jason
  Reply With Quote
Old 23rd May 2005, 09:34 AM   #3
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
Quote:
tell me how crucial it is that I make sure I use matched pairs and what the result would be if I didn't?
Sounds worse if you don't have good balance.
  Reply With Quote
Old 23rd May 2005, 09:57 AM   #4
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
Join Date: Jun 2002
Location: U.K.
Watford Valves have 12 different types of EL84 in stock and will match them for you. Just choose some that fit your budget (£7 to £20).

How affected the amp will be by mis-matched valves, depends on the design. Designs with common cathode resistors are most affected.

The Svetlana SV83 is a close cousin, and was available cheaply for a while. Can't seem to find any now.
  Reply With Quote
Old 23rd May 2005, 10:15 AM   #5
sajti is offline sajti  Hungary
diyAudio Member
 
Join Date: Apr 2003
Location: Vác, Hungary
JJ Electronic manufaturing EL84. They offer matched pairs. I ordered some KT88s, and EL34s, and the matching was perfect (about 2%)

sajti
  Reply With Quote
Old 23rd May 2005, 12:54 PM   #6
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Second on the JJs. Relatively inexpensive, good matching.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 24th May 2005, 11:11 AM   #7
Indy335 is offline Indy335  United Kingdom
diyAudio Member
 
Join Date: May 2005
Location: Bristol
Default contact info please

Thanks for all your input guys. I have tried to find JJ Electronic manufacturing on the web and/or phone number but I can't find either. Can anyone tell me how to contact them.

thanks

Indy
  Reply With Quote
Old 24th May 2005, 11:14 AM   #8
Giaime is offline Giaime  Italy
diyAudio Member
 
Giaime's Avatar
 
Join Date: Oct 2004
Send a message via MSN to Giaime
Default Re: contact info please

Quote:
Originally posted by Indy335
Thanks for all your input guys. I have tried to find JJ Electronic manufacturing on the web and/or phone number but I can't find either. Can anyone tell me how to contact them.

thanks

Indy

http://www.watfordvalves.com/

Better buy from some distributor near you than directly from JJ... also because I think they sell only big stocks.
  Reply With Quote
Old 24th May 2005, 11:23 AM   #9
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
Join Date: Jun 2002
Location: U.K.
World Audio Design have some JJ EL84's at £5 each here but not matched, I'm afraid.
  Reply With Quote
Old 24th May 2005, 12:21 PM   #10
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
In the US, I buy these from Triode Electronics. Ned is a good guy to deal with.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  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
LSK170, matched pairs in the UK. AndrewT Swap Meet 13 30th April 2013 06:43 AM
WR125ST's - 2 x matched pairs mrpopgun Swap Meet 8 10th February 2007 06:42 PM
Two matched pairs of 2Sj49 MOSFETS (TO3) darkmoebius Swap Meet 0 14th July 2005 05:52 AM
Two new 300B-matched pairs Djaki Swap Meet 1 4th June 2002 10:51 PM


New To Site? Need Help?

All times are GMT. The time now is 02:30 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