Does anyone know of an LTSpice model for 12B4? - diyAudio
 Does anyone know of an LTSpice model for 12B4?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 28th May 2008, 05:28 AM #1 diyAudio Moderator Emeritus     Join Date: Jan 2004 Location: Jakarta Does anyone know of an LTSpice model for 12B4? It looks like an interesting tube.
diyAudio Member

Join Date: Jun 2007
A guy named David Heiser has written an article on modeling tubes using Koren's models. You can read about it here:

http://www.daheiser.info/VTT/TEXT/va...0equations.pdf

On page 24 he mentions the 12B4, and how he had problems modeling it correctly. Nonetheless, here is a spice model based on the values he presented:

Quote:
 .SUBCKT 12B4 1 2 3 ; P G C; NEW MODEL + PARAMS: MU=7.5 EX=1.23 KG1=290 KP=48 KVB=280 RGI=1000 + CCG=5.5P CGP=5.5P CCP=2.0P ; ADD .7PF TO ADJACENT PINS; .5 TO OTHERS. E1 7 0 VALUE= +{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/SQRT(KVB+V(1,3)*V(1,3)))))} RE1 7 0 1G G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1} RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER C1 2 3 {CCG} ; CATHODE-GRID; WAS 1.6P C2 2 1 {CGP} ; GRID-PLATE; WAS 1.5P C3 1 3 {CCP} ; CATHODE-PLATE; WAS 0.5P D3 5 3 DX ; FOR GRID CURRENT R1 2 5 {RGI} ; FOR GRID CURRENT .MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) .ENDS
It is a PSpice model, so it should work LTspice as well.

 28th May 2008, 09:12 AM #3 diyAudio Moderator Emeritus     Join Date: Jan 2004 Location: Jakarta Thanks very much for that info.

 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 OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post rafafredd Pass Labs 3 11th April 2016 06:19 PM dave slagle Tubes / Valves 12 8th February 2014 06:02 AM flacer Solid State 6 21st May 2009 12:36 AM Anthony C Smith Chip Amps 2 2nd November 2007 05:58 AM Cybergent Everything Else 4 29th October 2005 11:14 PM

 New To Site? Need Help?

All times are GMT. The time now is 05:08 AM.