Cathode follower Class A output 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 14th May 2003, 02:36 AM   #1
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
Default Cathode follower Class A output stage?

Can anyone point me toward some stuff dealing with cathode follower class A type output stages? I imagine these would have some unique properties over more common type of o/p stage.
__________________
Best-ever T/S parameter spreadsheet.
http://www.diyaudio.com/forums/multi...tml#post353269
  Reply With Quote
Old 14th May 2003, 08:32 AM   #2
316a is offline 316a  England
diyAudio Member
 
316a's Avatar
 
Join Date: Dec 2002
Location: West London
Default CF

Hello ,
I've been pondering over something similar using 7236/5998a and mains toroids as output trannies which should work rather well . Driver stage is the main hiccup !

316a
  Reply With Quote
Old 14th May 2003, 11:32 AM   #3
RIP
 
pedroskova's Avatar
 
Join Date: Dec 2002
Location: C'ville VA, USA
Anthony Dockrill had an article in Valve discussing a 10Y driving a parafed CF 6L6GC in tetrode mode. No longer up on the web, but I could email you the pdf.

he discusses it a little here...

http://www.audioasylum.com/forums/tu...sages/530.html
  Reply With Quote
Old 14th May 2003, 11:48 AM   #4
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
Default Re: CF

Quote:
Originally posted by 316a
Hello ,
I've been pondering over something similar using 7236/5998a and mains toroids as output trannies which should work rather well . Driver stage is the main hiccup ! 316a
Hi 316a. Driver stage - yeah, it's gotta swing lots of volts doesn't it? Maybe bootstrapping it's dc rail from the output tube cathode would help. I assume you would use a parafeed setup when you use a toroid as an output tranny - it won't give very good bass response with dc flowing through it. There is no airgap in the core. Uhh, actually did you mean single ended or push pull class A? You just gotta post the results when you get it going, ok?
***************
pedroskova, that would be good if you would email me the pdf. Thank you. Thanks for the link too.
__________________
Best-ever T/S parameter spreadsheet.
http://www.diyaudio.com/forums/multi...tml#post353269
  Reply With Quote
Old 14th May 2003, 12:08 PM   #5
316a is offline 316a  England
diyAudio Member
 
316a's Avatar
 
Join Date: Dec 2002
Location: West London
Default Toroids

Push pull works fine with toroid outputs , DC cancels . Working on a toroid amp at present but not a CF one , remember the 'power' long tailed pair output stage I posted a while back ?

316a
  Reply With Quote
Old 14th May 2003, 12:27 PM   #6
diyAudio Member
 
Join Date: Feb 2002
Location: Michigan
Default cathode follower ops

.
__________________
Ryder
Any fool can ask more questions than seven sages can answer.
  Reply With Quote
Old 14th May 2003, 02:13 PM   #7
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
Default Re: Toroids

Quote:
Originally posted by 316a
Working on a toroid amp at present but not a CF one , remember the 'power' long tailed pair output stage I posted a while back ? 316a
This one? http://www.diyaudio.com/forums/showt...895#post125895
__________________
Best-ever T/S parameter spreadsheet.
http://www.diyaudio.com/forums/multi...tml#post353269
  Reply With Quote
Old 14th May 2003, 02:22 PM   #8
316a is offline 316a  England
diyAudio Member
 
316a's Avatar
 
Join Date: Dec 2002
Location: West London
Default Power long tail

That's the chap ! But I'll be using a depletion mosfet instead

316a
  Reply With Quote
Old 14th May 2003, 03:08 PM   #9
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
Quote:
Originally posted by pedroskova
Anthony Dockrill had an article in Valve discussing a 10Y driving a parafed CF 6L6GC in tetrode mode. No longer up on the web, but I could email you the pdf.
Here you go then -> gpratt@alphalink*com*au
Just change the asterisks to dots.
__________________
Best-ever T/S parameter spreadsheet.
http://www.diyaudio.com/forums/multi...tml#post353269
  Reply With Quote
Old 14th May 2003, 03:59 PM   #10
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Default Re: Toroids

Quote:
Originally posted by 316a
remember the 'power' long tailed pair output stage I posted a while back ?

316a
I built a 12E1 PP using an almost identical biassing scheme. Op points were 240Va-k, 120mA/tube, -34V , 5ka-a using a battery biassed 820 on a big sink. Got about 12W out of it. Took it apart to use the PS components in something else, as it was a bit hard on the chokes I had at the time. Sounded very good for a lash-up.

Which depletion mode MOS are you going to use? The DN2450?

Cheers
  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
Cathode Bypass in a PP Output Stage CLS Tubes / Valves 8 15th July 2008 05:32 AM
U-Follower: Output from Cathode or Plate? sgerus Tubes / Valves 5 23rd May 2007 08:30 PM
Question about direct coupling a anode follower into a cathode follower. G Tubes / Valves 45 29th July 2004 06:47 PM
cathode bypass in PP output stage? RichJones Tubes / Valves 23 31st October 2003 09:30 PM
Cathode follower driver stage Joel Tubes / Valves 23 16th November 2002 06:55 PM


New To Site? Need Help?

All times are GMT. The time now is 08:16 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