Help with circuitmaker Pentode model - 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 26th March 2010, 04:45 AM   #1
Jeb-D. is offline Jeb-D.  United States
diyAudio Member
 
Jeb-D.'s Avatar
 
Join Date: Nov 2005
Location: SoCal
Default Help with circuitmaker Pentode model

Hello,
Can anyone help me figure out how the numbers in bold are determined?

*Vacuum Tube Tetrode (Audio freq.)
.SUBCKT X7199P 1 6 3 4
B1 2 4 I=(((URAMP((V(7,4)/20)+V(3,4)))^1.5)/1206)*ATAN(V(1,4)/10)
B2 7 4 I=((URAMP((V(7,4)/20)+V(3,4)))^1.5)/2562
C1 3 4 5.0P
C2 3 1 0.06P
C3 1 4 2.0P
R1 3 5 5K
R2 2 4 2.5MEG
D1 1 2 DX
D2 4 2 DX2
D3 5 4 DX
D4 6 7 DX
D5 4 7 DX2
.MODEL DX D(IS=1.0P RS=1.0)
.MODEL DX2 D(IS=1.0N RS=1.0)
.ENDS X7199P

Thanks!
  Reply With Quote
Old 27th March 2010, 04:28 PM   #2
Jeb-D. is offline Jeb-D.  United States
diyAudio Member
 
Jeb-D.'s Avatar
 
Join Date: Nov 2005
Location: SoCal
Nobody
  Reply With Quote
Old 27th March 2010, 07:05 PM   #3
Svein_B is offline Svein_B  Norway
diyAudio Member
 
Join Date: Oct 2005
I wonder what a X7199P is.
Tried to plot the curves in LTSpice with your model, but did not make complete sense to me.

You may want to look at:
Norman Koren: Improved vacuum tube models for SPICE, Part 1

How to "paint" your own tube models: Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively

Svein.
  Reply With Quote
Old 27th March 2010, 11:39 PM   #4
Jeb-D. is offline Jeb-D.  United States
diyAudio Member
 
Jeb-D.'s Avatar
 
Join Date: Nov 2005
Location: SoCal
Quote:
Originally Posted by Svein_B View Post
I wonder what a X7199P is.
Tried to plot the curves in LTSpice with your model, but did not make complete sense to me.

You may want to look at:
Norman Koren: Improved vacuum tube models for SPICE, Part 1

How to "paint" your own tube models: Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively

Svein.
It's actually just the pentode section of a 7199.
This is a working model for circuitmaker which I copy pasted. LT Spice models might be a little different.

Any chance you know how amplification factor is determined for a pentode? I noticed it is used in all pentode model equations (including Norman Koren's). Pentodes are transconductance devices, so determining amplification factor without a specified load seems impossible to me. Perhaps it explains in his article, but I didn't catch it.

The paint your curves program looks really interesting. But, it's probably going to take a while for me to get it working properly on my computer. Then I'll have to figure out how to translate it's spice output into circuitmaker.

Eventhough the circuitmaker model is not the most accurate, it would certainly be easiest if I could just figure how those numbers were determined. It would be easy to create more models. Just copy-paste the model, change the name, those mysterious numbers and the capacitance values.

I've already figured out how to model triodes on circuitmaker (thanks to the help of others in this forum), just having problems with the pentode model.
  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
My attempt: 5 element Pentode Spice model aletheian Tubes / Valves 8 30th September 2013 01:19 AM
EF86 spice model is tetrode or pentode? Joseph R Software Tools 4 20th February 2010 08:00 PM
Spice 3f4 model of a low voltage direct heated signal level pentode wa2ise Tubes / Valves 0 24th April 2006 12:18 AM
CircuitMaker Vacuum Tube model Steen Bentzen Tubes / Valves 20 11th October 2005 04:13 AM
CircuitMaker loovet Pass Labs 2 1st December 2003 08:53 PM


New To Site? Need Help?

All times are GMT. The time now is 02:27 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