4P1L triode PP (40W!!?) - 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 11th April 2013, 10:57 AM   #1
diyAudio Member
 
Join Date: Mar 2008
Default 4P1L triode PP (40W!!?)

I am new in LTspice. For very first simulation I made PP with 4P1L in triode. I do not know if my simulation is OK. I got 40W (!!?) and 1% THD.

Is my schematic and meauser OK? Please comment.
Attached Images
File Type: png 4p1l PP 40W.png (36.1 KB, 431 views)
File Type: png 4P1L PP 40W sinus.png (18.8 KB, 420 views)
  Reply With Quote
Old 11th April 2013, 12:31 PM   #2
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
You have biased the tubes at -24 V, but you drive them with 260 Vpp AC.
What do you think about this ? Would it exceed typical values ?

Last edited by artosalo; 11th April 2013 at 12:33 PM.
  Reply With Quote
Old 11th April 2013, 06:44 PM   #3
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
40W from pair of Russian military tubes with 10W dissipation?

Click the image to open in full size.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th April 2013, 06:55 PM   #4
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
Play nicely now - this is how we learn.

Shoog
  Reply With Quote
Old 11th April 2013, 07:22 PM   #5
diyAudio Member
 
Join Date: Mar 2008
I am playing with this schematic for several days. I know that the 4P1L is "only" 10W, but I am curious why I get this result. Because of schematic? Because of tube model? Or beause LTspice does not work 100%?

A few mounts ago I build PP with 4P1L and I got around 4W. For driver and splitter I used 6N23P.
  Reply With Quote
Old 11th April 2013, 07:31 PM   #6
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
What load resistance did you have a few months ago?
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 11th April 2013, 07:31 PM   #7
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
Models fail to detect faulty start conditions. Thats where the users intelligence is essential to understand the limitation of the model. Spice doesn't understand power limits - it simply amplifies within the parameters of the valve stages and the input conditions. As was pointed out - your mistake was to input far to much signal to the outputs.

Shoog
  Reply With Quote
Old 11th April 2013, 07:49 PM   #8
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by Wavebourn View Post
What load resistance did you have a few months ago?
3.5K, I got 4W peak. My mistake in previous post.
  Reply With Quote
Old 11th April 2013, 07:50 PM   #9
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by Shoog View Post
Models fail to detect faulty start conditions. Thats where the users intelligence is essential to understand the limitation of the model. Spice doesn't understand power limits - it simply amplifies within the parameters of the valve stages and the input conditions. As was pointed out - your mistake was to input far to much signal to the outputs.

Shoog
I did not know that. Thanks for info.
  Reply With Quote
Old 11th April 2013, 07:55 PM   #10
45 is offline 45  Italy
diyAudio Member
 
45's Avatar
 
Join Date: Dec 2008
Location: UK
Quote:
Originally Posted by matejsirk View Post
I am playing with this schematic for several days. I know that the 4P1L is "only" 10W, but I am curious why I get this result. Because of schematic? Because of tube model? Or beause LTspice does not work 100%?
As already pointed out you cannot drive the 4P1L's with 260V signal. As it is a simulator valves will not get red hot and the amplifier won't disintegrate. This is not a fault of LTspice but yours. It will work as long as you feed it with sensible numbers....
Also 1K8 load is just too low.
I don't know if Ale has refined the model for positive grid region but it should be fine up to +10V grid voltage (except for the driver requirement of power drive). It is surely based on real curves. This means that if your bias is -24V you should only apply no more than 78V peak-to-peak signal to the grid not 260!

Last edited by 45; 11th April 2013 at 07:57 PM.
  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
snaken s-40w or sp-40w for pioneer sx-650 bolameon Swap Meet 1 3rd June 2011 08:07 PM
40W class A push pull amp with JJ 2A3-40w possible? 3nity Tubes / Valves 18 27th May 2010 12:05 AM
Which do you prefer - EL84 UL PP or EL34 Triode PP - and why? ray_moth Tubes / Valves 4 23rd February 2007 01:22 PM
PP-Triode , PP-UL , PP-Pentode-strapped-as-Triode percy Tubes / Valves 23 22nd January 2007 01:36 AM


New To Site? Need Help?

All times are GMT. The time now is 10:28 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