• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

GM70 and Other LTSpice Tube Models

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artosalo

artosalo

Member
Joined 2010
Thanks Lars

I run this model with my existing amplifying stage and it seems that the
model is quite different than the 6F12P pentode from 1990, the tube type where the heaters can not be seen.

This is my circuit:

An externally hosted image should be here but it was not working when we last tested it.



In real circuit the voltages and currents are as follows:

Ua = 92 V
Ia = 4,0 mA
Ug2 = 177 V
Ig2 = 0,47 mA

In actual circuit THD is 0,40 % when the output level is 20 Vrms.
In simulation the screen current is much smaller than in real case.
To get the simulation work as the actual circuit works the screen resistor should be some 750 k when in actual circuit it is 220 k.
 
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