Spice Models of Vacuum Tubes
Here are models of a few popular audio tubes that have been generously
donated by others*. (If you have any working models that you would
like to add, please let me know.)
general model for the heater of indirectly heated tubes
... and we even provide some example files.
phono preamp with RIAA equalization from RCA.
... or, you can get all of them zipped up together.
If you see any of the following people, thank them heartily for
Although I use PSpice occasionally, I have not tried these and
cannot offer much help with them. However, Francesco has told me
that he would not mind offering some support, time permitting. So
if you have a question that is not too much trouble to answer, or
would like to discuss Spice modeling of vacuum tubes, send him a
Francesco Piazza (firstname.lastname@example.org)
Norman Koren has written two wonderfully detailed and informative articles
for Glass Audio magazine. Anyone with a serious interest in
using Spice to model vacuum tube circuits should obtain a copies of his
article (see below about contacting Glass Audio.)
Mr. Koren has graciously offered the Spice source code to anyone that
drops him an email:email@example.com.
Of course, you'll still need to get the GA article to make sense
Intusoft has made available some
free IsSpice models of vacuum tubes. Visit their web site and look for
newsletters #34 and #35.
If you have other Spice models of vacuum tubes (even the same tubes)
please let me know. I would like to add them to the list!
Some references for spice modeling of vacuum tubes
1. Norman L. Koren, "Improved Vacuum Tube Models for Spice Simulations,"
Glass Audio, 5/96, p. 18.
2. Scott Reynolds, "Vacuum Tube Models for PSPICE Simulations,"
Glass Audio, 4/93, p. 17.
3. W. Marshall Leach, jr, "SPICE Models for Vacuum-Tube Amplifiers,"
J. Audio Eng. Soc., Vol 43, No 3, March 1995, p. 117
4. Charles Rydel, "Simulations of electron tubes with Spice,"
AES preprint 3965 (G1), 1995.
Glass Audio back issues and subscriptions are available
by contacting their Circulation Department at 603-924-9464 (voice),
603-924-9467 (FAX), email:
firstname.lastname@example.org, or write to Glass Audio,305 Union St.,
PO Box 176, Peterborough, NH 03458-0176, USA. Help support this fine
publication by subscribing or purchasing back issues rather than asking
for photocopies of articles.
Sources of free Spice software.
There are two companies that offer free "evaluation" versions of
MicroSim offers PSpice, and
Intusoft offers IsSpice.
It seems that PSpice is more commonly used (Francesco's models are PSpice
models), but some people have reported that IsSpice is more powerful. I
have very little personal experience with either (and no time to learn!),
so please don't expect me to be of any help deciding which to use. My
best advice is to try them both. If it tilts your decision,
Charles Hymowitz of Intusoft
has a lot of experience modeling tubes and has offered his help for all
types of Spice support (IsSpice, PSpice, or any other brand of Spice.)
the Audio Tube page
This page has been visited
times since 5 August 1996.