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Hello.

I have recently downloaded Ltspice and am trying to run a simulation with
a triode tube in but I get an error. I think this is because the triode
needs a subcircuit macromodel that I need to load into the triode symbol.
I am not sure how this is not and have looked in the help function but was
unable to find anything.

Does anyone know how I can add a triode subcircuit macromodel to my
circuit or direct me to a help page where I can learn about it.

Thanks for your help

Kind Regards,
Mike Harris

--- In LTspice@..., Michael.Harris@... wrote:

Hello.

I have recently downloaded Ltspice and am trying to run a simulation with
a triode tube in but I get an error. I think this is because the triode
needs a subcircuit macromodel that I need to load into the triode symbol.
I am not sure how this is not and have looked in the help function but was
unable to find anything.

Does anyone know how I can add a triode subcircuit macromodel to my
circuit or direct me to a help page where I can learn about it.

Thanks for your help

Kind Regards,
Mike Harris

Hello Mike,

You should copy the model file into the folder of your schematic.
Then add a .lib or .inc directive into your schematic.

.lib name_of_model


Please don't keep your own designs in any directory below
the path C:\program files, because you don't have all the
sometimes necessary permissions in this folder.

Best regards,
Helmut

The other alternative, if the triode subcircuit is relatively short (say
less than one or two dozen lines), is to paste it directly onto the
schematic.

In LTspice, click on the ".op" icon (far right on the toolbar) to add a
"SPICE directive". A SPICE directive can be anything that you want to
appear in the SPICE netlist. That includes subcircuits. Now copy (ctrl-C)
the contents of the subcircuit from a text editor, and paste it (ctrl-V)
into the box in the SPICE directive pop-up window, and click OK. Place it
in any available space on the schematic (the position doesn't matter).

Functionally, a .lib or .include (.inc) statement does the same thing. It
makes the subcircuit appear in the SPICE netlist.

Andy

Thanks Andy, Helmut,

This is helpful.

The Triode symbol within LTSpice does not have a subcircuit macromodel
attached to it, I need to supply this myself.

As I am not familiar with the format of how these subcircuits appear
within LTSpice or what it is for a Triode does anyone know where I can get
this from?
Is there a library online that I can get it from or a subcircuit that I
can edit?

Kind Regards,
Mike Harris





From: Andy <Andrew.Ingraham@...>
To: LTspice@...
Date: 23/07/2013 03:59
Subject: Re: [LTspice] subcircuit macromodel
Sent by: LTspice@...




The other alternative, if the triode subcircuit is relatively short (say
less than one or two dozen lines), is to paste it directly onto the
schematic.

In LTspice, click on the ".op" icon (far right on the toolbar) to add a
"SPICE directive". A SPICE directive can be anything that you want to
appear in the SPICE netlist. That includes subcircuits. Now copy (ctrl-C)
the contents of the subcircuit from a text editor, and paste it (ctrl-V)
into the box in the SPICE directive pop-up window, and click OK. Place it
in any available space on the schematic (the position doesn't matter).

Functionally, a .lib or .include (.inc) statement does the same thing. It
makes the subcircuit appear in the SPICE netlist.

Andy

Hello Mike,

You could look in our Files section for models and examples.

Files > Lib > Tubes_Valves > Koren_Tubes.cir Tube_IM.lib



Another source


Best regards,
Helmut

Thanks for your help.

Kind Regards,
Mike





From: "Helmut" <helmutsennewald@...>
To: LTspice@...
Date: 23/07/2013 11:14
Subject: [LTspice] Re: subcircuit macromodel
Sent by: LTspice@...




Hello Mike,

You could look in our Files section for models and examples.

Files > Lib > Tubes_Valves > Koren_Tubes.cir Tube_IM.lib



Another source


Best regards,
Helmut

--- In LTspice@..., Michael.Harris@... wrote:

Thanks Andy, Helmut,

This is helpful.

The Triode symbol within LTSpice does not have a subcircuit macromodel
attached to it, I need to supply this myself.

As I am not familiar with the format of how these subcircuits appear
within LTSpice or what it is for a Triode does anyone know where I can

get

this from?
Is there a library online that I can get it from or a subcircuit that I
can edit?

Kind Regards,
Mike Harris





From: Andy <Andrew.Ingraham@...>
To: LTspice@...
Date: 23/07/2013 03:59
Subject: Re: [LTspice] subcircuit macromodel
Sent by: LTspice@...




The other alternative, if the triode subcircuit is relatively short (say
less than one or two dozen lines), is to paste it directly onto the
schematic.

In LTspice, click on the ".op" icon (far right on the toolbar) to add a
"SPICE directive". A SPICE directive can be anything that you want to
appear in the SPICE netlist. That includes subcircuits. Now copy

(ctrl-C)

the contents of the subcircuit from a text editor, and paste it (ctrl-V)
into the box in the SPICE directive pop-up window, and click OK. Place

it

in any available space on the schematic (the position doesn't matter).

Functionally, a .lib or .include (.inc) statement does the same thing.

It

makes the subcircuit appear in the SPICE netlist.

Andy