Hybrid Aikido-ish gain stage - 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 1st September 2006, 08:47 AM   #1
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
Default Hybrid Aikido-ish gain stage

How about this circuit for driving a Mosfet power follower?
ECC86 is the european version of 6GM8, before anyone misreads and asks why Im using ECC88 (6DJ8) at such low plate voltage.

A short explanation of the schematic:
The triode is of course the actual gain device, operating at 15V 2mA. The plate is loaded with a 2SK170-based CCS and direct coupled to a cascoded Jfet White follower.
This *should* give that whimpy little triode pretty much optimal circumstances to do its job as a voltage gain stage.
IME this tube is hardly capable of driving anything by itself, but this follower should be a very easy load.
Attached Images
File Type: jpg ecc86.jpg (13.9 KB, 1262 views)
  Reply With Quote
Old 2nd September 2006, 08:38 PM   #2
JoshK is offline JoshK  Canada
diyAudio Member
 
Join Date: May 2004
Location: Toronto, ON
This circuit looks pretty cool to my newbish eyes. Have you built it yet?
  Reply With Quote
Old 3rd September 2006, 08:33 PM   #3
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
Im working on it, will probably finish it tomorrow
  Reply With Quote
Old 5th September 2006, 09:49 AM   #4
Fuling is offline Fuling  Sweden
diyAudio Member
 
Join Date: Aug 2001
Location: Sweden (Mora)
The circuit is built and tested and the results are very promising!
50kHz with a IRFP260-based follower on the output is no problem.
Im planning to run much more tests on this one later, when I can borrow some better test equioment.
  Reply With Quote
Old 4th July 2014, 09:21 PM   #5
diyAudio Member
 
Join Date: Jan 2008
Default Another hybrid idea

Hi,

I have come up with this Aikido hybrid preamp. In simulation distortion is same as with 6SN7 as cathode follower. I have not built it yet, so no comparison with all tube Aikido.

MJE350 is biased at 4mA and IRF610 at 10mA.
Attached Images
File Type: jpg AIKIDO DRIVER MOSFET.JPG (77.2 KB, 125 views)
  Reply With Quote
Old 5th July 2014, 03:22 PM   #6
ilimzn is offline ilimzn  Croatia
diyAudio Member
 
Join Date: Feb 2005
Location: Zagreb
MOSFETs are not triodes, rather pentodes, and the influence of Vds to drain current is very small, hence no sense doing an Aikido style ripple nulling CCS for a MOSFET.
  Reply With Quote
Old 5th July 2014, 05:44 PM   #7
diyAudio Member
 
Join Date: Jan 2008
Look here and scroll down to chapter "Variations".

Aikido Tube Amplifiers
  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
aikido hybrid with 5 A bias oliezt Tubes / Valves 2 30th July 2007 02:54 AM
Heretical Unity Gain line stage PLUS a little gain ? yagas Tubes / Valves 7 24th January 2006 01:30 PM


New To Site? Need Help?

All times are GMT. The time now is 04:27 AM.


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