Impedans of trafo for EL504 inSE - 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 25th June 2006, 02:29 AM   #1
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Default Impedans of trafo for EL504 inSE

What impedans should the trafo be for triodmode.Is 2,5k to low?
__________________
Regards Åke
  Reply With Quote
Old 25th June 2006, 09:10 AM   #2
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
2,5k is a bit high, I used something like 1,3k in my prototype PL504 SE triode amp.
  Reply With Quote
Old 25th June 2006, 08:23 PM   #3
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Ok,hello "Fuling" .What if I use 2,5K is the "only"side effect less outputpower,or are there more?
__________________
Regards Åke
  Reply With Quote
Old 25th June 2006, 08:35 PM   #4
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
It will probably work just fine, as long as the transformer can handle ~100mA DC. EL504 seems to work best at low voltage and high current.
  Reply With Quote
Old 26th June 2006, 03:29 PM   #5
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
I have 2 tubes by the number of"76" can these be used as a driver for the El504,if I use the 504 at 80mA 175v.The 76 have a ampl.faktor of 13.8, does that mean that if i send 2v in I get 27,6 out?If its to low I ment to use a 6DJ8
__________________
Regards Åke
  Reply With Quote
Old 27th June 2006, 04:32 PM   #6
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
What driver did you use?Any feedback? Do you have a schema?
__________________
Regards Åke
  Reply With Quote
Old 27th June 2006, 09:52 PM   #7
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
If I remember correctly I used PC86 as drivers, loaded with Hammond 156C chokes. The OPT´s was my own design that involved 25% cathode feedback.
The amp put out a couple of watts and sounded quite darn good, but for various reasons it never got further that the prototype stage. No schematic available.
  Reply With Quote
Old 25th December 2010, 12:45 AM   #8
edonion is offline edonion  Portugal
diyAudio Member
 
Join Date: Feb 2004
Location: Aveiro
This is my PL504 push-pull amplifier.
I have good results with 750 Ohms Plate to Plate.
http://edonion.com/documents/EdonionSpeedy.pdf

You can see it here
Transformadores

I hope you enjoy it. Sounds very good
  Reply With Quote
Old 16th August 2012, 09:14 PM   #9
pilovis is offline pilovis  Italy
diyAudio Member
 
Join Date: Jan 2012
Location: Nizza Monferrato - Italy
The correct value for PL504 is 800 ohm.
  Reply With Quote
Old 16th August 2012, 10:19 PM   #10
edonion is offline edonion  Portugal
diyAudio Member
 
Join Date: Feb 2004
Location: Aveiro
Quote:
Originally Posted by pilovis View Post
The correct value for PL504 is 800 ohm.
I can not be as accurate. Since my components have 5% tolerance and the impedance of a speaker is not a constant.
The only thing I can say is that the amplifier is constructed as the above scheme and it works flawlessly.

Last edited by edonion; 16th August 2012 at 10:24 PM.
  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
EL504/PL504 spice model aparatusonitus Tubes / Valves 7 29th January 2009 10:15 PM
Power supply options.. bigger trafo with less caps or medium trafo with heavy caps? rhythmdiy Chip Amps 9 23rd October 2007 01:30 AM
trafo.. samsagaz Chip Amps 16 31st August 2004 03:17 PM
FS: 22 pcs NOS NIB RSD EL504. webercarbmann Swap Meet 0 25th July 2003 03:03 PM
Trade EL504 - ? webercarbmann Swap Meet 0 24th June 2003 12:07 AM


New To Site? Need Help?

All times are GMT. The time now is 09:00 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