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C3g simulation model

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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
 

Attachments

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.
 

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  • c3g-curves.gif
    c3g-curves.gif
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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.
 
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 ?
 
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