Free Spice for Windows with transconductance?

[John Sankey]

I downloaded the free version of Tina-TI, but have found that it doesn't
have the I(U) (transconductance) source available even though it is
described in help. I'm modelling vacuum tube amps and need it. Does anyone
know of a way to add the I(U) source to this version of Tina-TI? Or, is
there another free Windows (Me) SPICE available that has it?

Note: if you reply by email, you must include 'Byrd' in the subject line
to get through my spam filter.

 

[Helmut Sennewald]

I downloaded the free version of Tina-TI, but have found that it doesn't
have the I(U) (transconductance) source available even though it is
described in help. I'm modelling vacuum tube amps and need it. Does anyone
know of a way to add the I(U) source to this version of Tina-TI? Or, is
there another free Windows (Me) SPICE available that has it?

Note: if you reply by email, you must include 'Byrd' in the subject line
to get through my spam filter.

Hello John,

I expect that you can use this sources in a subcircuit (.subckt ...) in
Tina-Ti.
Tina-TI requires at least one TI-opamp in the schematic, doesn't it?

I and many others use the free of charge LTspice. It has no limitation
regarding circuit size , the type of components used in your circuit and
whatwever you can think of.
http://www.linear.com/designtools/software/switchercad.jsp

The user group
http://tech.groups.yahoo.com/group/LTspice/

A first resource for tubes(valves). You will find more if you search with
Google.
http://www.duncanamps.com/technical/ltspice.html

Best regards,
Helmut

 

[John Sankey]

Many thanks, Helmut. I hadn't got far enough in Tina-TI to hit that
problem, just far enough to realise it had a problem with tube models.
Downloaded LTspice and had my first model running within the hour.
Seems to work perfectly.

Many thanks for your help.
John

 

[krw]

Hello John,

I expect that you can use this sources in a subcircuit (.subckt ...) in
Tina-Ti.
Tina-TI requires at least one TI-opamp in the schematic, doesn't it?

Yes. Before I "graduated" from Tina-TI, I'd just stick a voltage
follower in the corner somewhere, not doing anything.

I and many others use the free of charge LTspice. It has no limitation
regarding circuit size , the type of components used in your circuit and
whatwever you can think of.
http://www.linear.com/designtools/software/switchercad.jsp

The user group
http://tech.groups.yahoo.com/group/LTspice/

I haven't had time to try LTSpice, but forget a real Tina license.
Tina-TI is OK for what it is, but the "classic" version ($500) is
*JUNK*.