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 27th October 2011, 09:24 PM   #1
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
Default Push Pull Class A

How does one go about setting an amp up to run in class A. I am bad with load lines for power tubes so if someone can get me started that would be great.
  Reply With Quote
Old 27th October 2011, 09:34 PM   #2
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
Lets use 6L6GB:
Attached Images
File Type: jpg load line.JPG (255.1 KB, 430 views)
  Reply With Quote
Old 27th October 2011, 09:43 PM   #3
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
For OT lets use 4k CT and aiming for about 35watts, 17.5w per tube
  Reply With Quote
Old 27th October 2011, 09:47 PM   #4
kevinh is offline kevinh  United States
diyAudio Member
 
Join Date: May 2007
Lynn Olson made a couple of Class A DHT push pull amps, they were however 15 watt. However the information he provides will be very useful to you:

The Amity, Raven, and Aurora
  Reply With Quote
Old 27th October 2011, 09:54 PM   #5
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
half of 4k ct is 2k, 400 plate volts so the math would be:
400/2000=.2 amps
Attached Images
File Type: jpg load.JPG (256.7 KB, 385 views)
  Reply With Quote
Old 27th October 2011, 10:02 PM   #6
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
oops wrong graph Here we go:
Attached Images
File Type: jpg load line.JPG (288.2 KB, 370 views)
  Reply With Quote
Old 27th October 2011, 10:03 PM   #7
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
I am on the right track?
  Reply With Quote
Old 27th October 2011, 10:36 PM   #8
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
how do i get the curve or "knee" for plate dissipation on the graph?
  Reply With Quote
Old 27th October 2011, 10:43 PM   #9
Account disabled at member's request
 
Join Date: Apr 2009
Quote:
Originally Posted by famousmockingbird View Post
half of 4k ct is 2k, 400 plate volts so the math would be:
400/2000=.2 amps
It is better to speak of "4k plate-plate".
Halve the 4k primary related to the secondary is not 2k but 1k.
I guess you know that the general rule for class A is that both tubes conduct during the full cycle.
  Reply With Quote
Old 27th October 2011, 11:04 PM   #10
Account disabled at member's request
 
Join Date: Apr 2009
I found a good link:

www.freewebs.com/valvewizard1/pp.html
  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
2A3s in push pull; class A Sir Trefor Tubes / Valves 44 31st May 2013 03:37 AM
A question about Push-pull class-a mutter Pass Labs 8 17th July 2010 07:04 PM
Class B Push-Pull rsumperl Tubes / Valves 31 16th July 2010 06:18 PM
Class A push-pull Nikolas Ojala Pass Labs 5 24th August 2009 12:58 PM
EL34 Push Pull in Class A arnoldc Tubes / Valves 29 17th May 2006 11:52 AM


New To Site? Need Help?

All times are GMT. The time now is 11:25 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