C3g simulation model

[hesener]

Hi, looking for a simulation model for SPICE for the C3g that will support operation as pentode.....

all my searching lead to nowhere.... can somebody help?

thanks in advance

 

[Svein_B]

A Google search for ".SUBCKT C3G" found this:
Tube Models for TINA

The models are for Tina, and may need a little editing for use in LtSpice,
such as relapsing ^ with ** (and maybe a couple of other things?)

Svein

 

[hesener]

fantastic.... I searched for hours, but the ".subckt" thing never occurred to me....

many thanks!!!

 

[hesener]

C3G simulation model for LTSpice

The model works beautifully, after some syntax modification. In the circuit attached, the operating point analysis got me pretty much the datasheet values (plate at 215V, screen at 150V and 3mA, cathode at 2V and 13.7mA (datasheet 13.3mA)). For the triode, the plate voltage was 208V and the current 17.3mA (datasheet 17mA). The datasheet values are from the "Telefunken" datasheet from 1963.

The models are attached, just in case somebody needs them (C3GP for the pentode, and C3GT for the triode).

best regards

 

[hesener]

Credit goes of course to Ayumi Nakabayashi who created the models in the first place. Sorry I should have mentioned that in my previous post

domo arigato

 

[Svein_B]

Yes, the models seem to work OK.
(after replacing ^with ** and removing the period at the end of the line after the X3 parameter)

Attached is curvetraces from LtSpice compared to the Lorenz datasheet.
(the Telefunken curves are slightly different)

There is good conformance - except at low anode voltage.

SB.

 

[dsavitsk]

Can anyone help me get this to work? I downloaded the models and LTSpice gives the following error:

Fatal Error: Port(pin) count mismatch between the definition of subcircuit "c3g" and instance: "xu1"
The instance has more connection terminals than the definition.

The pentode schematic symbol has a suppressor grid connection, which I am guessing is the error. I did get it to run using the tetrode model, but I am not sure if that is the "correct" thing to do.

 

[revintage]

Yiu should run it as tetrode not pentode. The model only has four connections.

 

[tinitus]

I was once told its best to run the C3g in ultra linear
never found out how to do it
I thought it meant using IT, but maybe not

now I realise it might be like E-linear ?
or is it 'just' a matter of adjusting the screen voltage ?

 

[yagoolar]

hesener,
I replaced previously found C3g triode model with Mr. Nakabayashi's. The simulated amp gain dropped from 18dB do 13.5dB. Hmm. Big difference.

 

[yagoolar]

that is previous one

.subckt C3g P G K
Bp P K I=(1.685066375m)*uramp(V(P,K)*ln(1.0+(-0.480394591)+exp((2.06754524)+(2.06754524)*((74.28987989)+(-2134.065092m)*V(G,K))*V(G,K)/V(P,K)))/(2.06754524))**(1.107185862)
.ends c3g