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

12AX7 SE baby amp
12AX7 SE baby amp
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 19th June 2017, 11:48 PM   #1
vizion is offline vizion  United States
diyAudio Member
 
Join Date: Apr 2007
Default 12AX7 SE baby amp

Has anyone built a 12ax7 SE amp ? I wonder how many milliwatts it can produce.
  Reply With Quote
Old 20th June 2017, 12:50 AM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
12AX7 SE baby amp
12AX7 plate resistance is too high for practical output transformers. (EAR did do a massively parallel PP amp with 12AX7A some time ago.)

Consider the 6CG7/6FQ7 or 12AU7A for a flea power SE if this is really the way you want to go.
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 20th June 2017, 01:05 AM   #3
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
As Kevin says, you can't make a wide-band audio transformer with enough impedance to get real power out of the 12AX7 high impedance.

I plotted 22K, the reverb transformer sold for Fenders using a 12AT7 reverb driver. Say 65mW. A bit more depending how you feel about max plate voltage. (I'm sure 400V is not instant death, but also not a lot more power.)
Attached Images
File Type: gif 12AX7-max-power.gif (22.4 KB, 267 views)
  Reply With Quote
Old 20th June 2017, 05:30 AM   #4
vizion is offline vizion  United States
diyAudio Member
 
Join Date: Apr 2007
thanks guys
  Reply With Quote
Old 20th June 2017, 03:38 PM   #5
kodabmx is offline kodabmx  Canada
diyAudio Member
 
Join Date: Oct 2011
Location: Toronto
The 6N*P except 6N2 are good candidates, too.
  Reply With Quote
Old 21st June 2017, 02:14 PM   #6
Ketje is offline Ketje  Belgium
diyAudio Member
 
Ketje's Avatar
 
Join Date: Dec 2012
Location: Flanders
How about a serial SE
Mona
Attached Images
File Type: jpg 83serSE.jpg (41.8 KB, 142 views)
  Reply With Quote
Old 27th June 2017, 03:22 PM   #7
Lingwendil is offline Lingwendil  United States
Now with high-fructose ASSAULT-gluten!
diyAudio Member
 
Lingwendil's Avatar
 
Join Date: Apr 2008
Location: Oakley California
12AX7 SE baby amp
6SN7, 12AU7, or 6DJ8 would be much better candidates... I can squeeze around a half watt out of a 6SN7 in SE.
__________________
Check out My 6SN7 Push-pull Flea Amplifier project! PCB COMING SOON!
  Reply With Quote

Reply


12AX7 SE baby ampHide 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 Amp - Baby Huey gingertube Tubes / Valves 2078 13th June 2018 09:32 AM
el84/12ax7 se schematic needed! tubo Tubes / Valves 9 28th February 2013 02:21 AM
My new baby amp suzyj Solid State 21 19th May 2009 02:11 PM
SE 6C33C-B ; preview of a new Baby Alain Dupont Tubes / Valves 51 27th September 2006 01:15 PM


New To Site? Need Help?

All times are GMT. The time now is 10:15 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki