Loadlines for Parallel SE outputs - 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 24th February 2013, 03:22 AM   #1
diyAudio Member
 
Richard Ellis's Avatar
 
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Default Loadlines for Parallel SE outputs

I'm putting together this PSE amp using the 12B4 doubled up running into an OPT at 2500 ohms. With only 170VDC for my B+, I get a really 'steep' loadline for the 12B4......my question is 'How does one do the DC loadline for "twin" ouput tubes.??? I,m trying to get a handle on how much current each channel will be drawing.



__________________________________________________ ______Rick.......
Attached Images
File Type: gif 12B4Amp.gif (6.8 KB, 155 views)
  Reply With Quote
Old 24th February 2013, 04:16 AM   #2
DUG is online now DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
Double your load impedance at half the total quiescent current.

Each tube will see half the total current and will only have to drive half the load: 2500 * 2 = 5000 ohms

The transformer will still operate at the same quiescent current.

Makes sense?
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 25th February 2013, 12:35 AM   #3
diyAudio Member
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
Slightly OT, how does one go about calculating the bias for three DIFFERENT power tubes in SE, like Palmer Triple SE

I think the OPT has three separate primaries, so each tube type could see the correct impedance, is it just that simple?

Jaz
  Reply With Quote
Old 26th February 2013, 04:36 AM   #4
DUG is online now DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
How the Palmer Triple SE works is your guess as much as mine.

Could be all three tubes work the same way with similar bias points...or maybe that is the only change between the three...different cathode resistors.

Let us know what you find out.

__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  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
paralleling computer power supply outputs: can they be connected in parallel... jarthel Parts 7 12th December 2012 10:13 PM
Diamond buffer headphone amp- can I parallel outputs? Fast Eddie D Headphone Systems 11 17th August 2012 04:25 PM
Parallel outputs? jerryo Class D 2 2nd December 2009 08:22 AM
Parallel LM4780/3886: leave away those 0,2Ohm between the outputs? Bassterror Chip Amps 13 11th August 2006 05:10 PM
Parallel SE vs. Single SE Output Question valveitude Tubes / Valves 19 4th May 2005 06:36 PM


New To Site? Need Help?

All times are GMT. The time now is 01:54 PM.


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