• 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.

Spice Model 6CW4

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Here it is, custom made courtesy Robert Casey, WA2ISE :)

*Vacuum Tube nuvistor .SUBCKT X6CW4a A G K

* ANODE MODEL

BLIM LI 0 V=(URAMP((V(A)-V(K))))* 0.0037
BGG GG 0 V=((V(G)-V(K))*1.05)--0.14
BRP1 RP1 0 V=URAMP(-V(GG)* 0.09869 )
BRP2 RP2 0 V=V(RP1)-URAMP(V(RP1)-0.999)
BRPF RP 0 V=(1-V(RP2)^ 1 )+URAMP(V(GG))* 0.1
BGR GR 0 V=URAMP(V(GG))-URAMP(-(V(GG)*(1+V(GG)* 0.012937 )))
BEM EM 0 V=URAMP(V(A)-V(K)+V(GR)* 50.093 )
BEP EP 0 V=(V(EM)^ 1.53 )*V(RP)* 0.00001563
BEL1 EL1 0 V=URAMP(V(EP))
BEL EL 0 V=V(EL1)-URAMP(V(EL1)-V(LI))
BLD LD 0 V=URAMP(V(EP)-V(LI))
BAK A K I=V(EL)

* GRID MODEL

BGF GF 0 V=(URAMP(V(G)-V(K)--0.5 )^1.5)* 0.00012
BG G K I=V(GF)+V(LD)

* CAPS

CAK A K 0.00000000000018
CGK G K 0.0000000000043
CGA G A 0.00000000000092

.ENDS X6CW4a

A page with lots of 3f4 models is here:

http://home.netcom.com/~wb2jia/tubes/spice.txt

These are "drop in and go" for Circuit maker and Circuit Maker Student, but should function on all 3f4 based spice.
 
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