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Old 5th December 2004, 11:34 PM   #1
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Default Spice 3f4 "Koren" models

Help,

The simulator I have to work with is X-Spice, actually Spice 3f4 with extentions for mixed analog and digital. Its part of the PROTEL 99SE Schematic Capture and PCB Layout suite I use.

I'm looking for Spice 3f4 models for "garden variety" twin triodes and beam tetrode and pentode output tubes. The Norman Koren implementation preferably.

Actually this is an exersize in lazyness. I don't want to sit down and implement/check the models from scratch if they are already available somewhere (that is if someone has already done it).

Converting the Koren P-Spice models to Spice 3f4 is not that difficult its just a pain in the proverbial as there is no direct equivalent function in 3f4 for one of the key P-Spice functions that Koren uses.

Cheers,
Ian
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Old 5th December 2004, 11:59 PM   #2
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Some 3f4 spice (originally for Circuit Maker), thanks to Robert Casey, WA2ISE and friends
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File Type: txt spice.txt (21.0 KB, 80 views)
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Old 6th December 2004, 12:00 AM   #3
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And part-II
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Old 6th December 2004, 02:13 AM   #4
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Default Thanks Geek

Thanks for these models.

One other question.

I have modeled the output transformer as mutual coupled inductors.

Unfortunately there doesn't appear to be an equivalent to the P-Spice K-ALL function in 3f4 so I had to write all of the K statements separately. This seemed to work OK but was a long a labourious process in entering the model.

Any ideas / references on a better way?

Thanks again,
Ian

P.S. Notes for newbies to modeling:
1) The simulation will be exactly as good as your models - no better, no worse.
2) The best simulation of a vaccuum tube is done on the bench using a vaccuum tube.
Despite the above simulation is VERY useful as a method of avoiding basic errors.
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Old 6th December 2004, 05:15 AM   #5
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Default Re: Thanks Geek

Quote:
Originally posted by gingertube
I have modeled the output transformer as mutual coupled inductors.

Unfortunately there doesn't appear to be an equivalent to the P-Spice K-ALL function in 3f4 so I had to write all of the K statements separately. This seemed to work OK but was a long a labourious process in entering the model.

Any ideas / references on a better way?
Yes. There are some excellent 3f4 transformer models with CM Student. Rob the models from there


Quote:
Originally posted by gingertube

2) The best simulation of a vaccuum tube is done on the bench using a vaccuum tube.
Despite the above simulation is VERY useful as a method of avoiding basic errors.
Very true. After breadboarding a modeled tube circuit, the DC voltages and currents are usually dead-on, but AC performance? That's where the experimenters know-how comes in
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