Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

EL84 Triode PP Design
EL84 Triode PP Design
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 14th December 2007, 04:10 AM   #1
sorenj07 is offline sorenj07  Germany
diyAudio Member
 
sorenj07's Avatar
 
Join Date: May 2006
Location: Berlin
Default EL84 Triode PP Design

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


I have the EL84's, the OPT's, and the 6N23P's are on the way.

Power supply:
Hammond 273BX (350-0-350 175mA) rectified by two UF4007 per leg bypassed by .1uF 1KV, into 193M choke (10H 300mA 63 ohms) and 440uF 450V cap, bypassed with 1uF 630V, feeding B+. B++ taps off a 20H 20mA 1.67K and 100uF 400V bypassed with another 1uF 630V, for the two 6mA regulators at 275V. The C- supply is a voltage doubler running off the unused 5A tap.
  Reply With Quote
Old 14th December 2007, 05:00 AM   #2
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
EL84 Triode PP Design
You've got a negative rail there, why not use it and do a better CCS tail for the input stage- or at least give the one you have a bit more headroom?
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 14th December 2007, 06:51 AM   #3
sorenj07 is offline sorenj07  Germany
diyAudio Member
 
sorenj07's Avatar
 
Join Date: May 2006
Location: Berlin
Could I just connect the -15v supply right to the LM334 as it is?
  Reply With Quote
Old 14th December 2007, 12:27 PM   #4
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
EL84 Triode PP Design
I don't know its voltage rating off the top of my head, but if that's within it, then yes, and that will give the CCS a little more breathing room.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 14th December 2007, 12:41 PM   #5
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
EL84 Triode PP Design
He can bypass the LM CCS with a good lytic cap to increase quality, can't he? Better off with DC duty on such a CCS only?
  Reply With Quote
Old 14th December 2007, 01:27 PM   #6
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
EL84 Triode PP Design
If he doesn't want the phase splitter to function, then sure, he can bypass the tail CCS.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 14th December 2007, 01:55 PM   #7
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
EL84 Triode PP Design
Blunder. DC only works in SE.
  Reply With Quote
Old 14th December 2007, 02:05 PM   #8
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
EL84 Triode PP Design
But how it works in Baby Huey? Is it partial?
Attached Images
File Type: gif screenshot7.gif (39.4 KB, 632 views)
  Reply With Quote
Old 14th December 2007, 02:13 PM   #9
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
EL84 Triode PP Design
It's only bypassing the reference string, not the CCS terminal (the collector of the "upper" transistor).
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 14th December 2007, 02:22 PM   #10
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
EL84 Triode PP Design
Must be sounding better this partial thing. I have to check it out in mine.
  Reply With Quote

Reply


EL84 Triode PP DesignHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
EL84 fixed bias PP Triode DrewP Tubes / Valves 23 24th November 2013 09:17 PM
My EL84 Triode PP Amp sorenj07 Swap Meet 7 19th June 2008 05:13 PM
Which do you prefer - EL84 UL PP or EL34 Triode PP - and why? ray_moth Tubes / Valves 4 23rd February 2007 01:22 PM
triode => I.T. =>el84 good idea ? Jaap Tubes / Valves 9 7th January 2003 08:30 PM


New To Site? Need Help?

All times are GMT. The time now is 07:44 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki