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[Guest]

Someday I'd like to ascend the learning curve and create my own models,
but for now I must rely on the kindness of others.

Can anyone here point me to good 3F4 models for 6SL7, 6SN7 and 12BH7? I
have some simple models I found on a couple of websites, but have found
the performance of these models somewhat removed from reality
(especially when approaching overload conditions). On the other hand, I
know there are participants on this newsgroup who have created some
superb models for other triodes, which I have used and found quite
accurate.

Thanks in advance for your help.

--Dave

[Simon]

Hi,

Did you try the models of Andrei Frolovs? (mentioned om this site):

http://home.netcom.com/~wb2jia/tubes/spice3.txt

They are available in different models, and very accurate. I don't know
where to find a good 12BH7 model, but that is ( I guess) because I didn't
need one yet.

Hope this helps.

Simon van de Laak


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[Guest]

Thanks. I did try those, but they won't work in Circuitmaker. Outside
of adding "X" to the device name, I don't know how to alter them to
make them work for me.

Simon wrote:

[Robert McLean]

<electronic_dave@hotmail.com> wrote in message
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[Guest]

Hmmm... Circuitmaker doesn't like those either. It keeps returning
syntax errors. The format does appear quite different from that of the
models I have that DO work. Are these 3F4? I wish I knew what to look
for.

[Simon]

Hi,

Did you change the "m" seen on constants to "e-3", "k" to "e3" or
"exp" to "2.7182818^". The first two changes did work for me (circuitmaker
2000)

With kind regards,

Simon van de Laak

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[Simon]

for example:

Bg G K I=(0.2079346639m)*uramp(V(G,K))^1.5 *
(((14.97041148)+V(P,K))/((9.844374217)+V(P,K)))^4

should be:

Bg G K I=(0.2079346639e-3)*uramp(V(G,K))^1.5 *
(((14.97041148)+V(P,K))/((9.844374217)+V(P,K)))^4

in circuitmaker.

Hope this helpes,

Simon van de Laak

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[Robert McLean]

oops .... I may have given you PSPICE versions. The spice programs I
currently use, LTSpice and MicroCap, handle both versions so I have gotten
lazy about checking for 3F4 vs PSpice. As for "what to look for" here is a
list of some conversion hints. There are some other things having to do
with curly brackets, { }, I forget which version seems to need them.

PSpice 3F4
Limit(X, 0, 1e6) URamp(X)
or (X + Abs(x))/2

Pwrs(x,y) x^y (as long as x >= 0)
Pwr(x,y) x^y

Ex N1 N2 Value = Bx N1 N2 V=
Gx N1 N2 Value = Bx N1 N2 I =

If( a<b, a, b) (Abs(a-b) - (a+b))/(-2)
If( a>b, a, b) (Abs(a-b) + (a+b))/2




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