My E88CC/6922 Tube model seems to drag down LTSpice.
Anyone have a working model or point me to one?
Thanks in advance
Anyone have a working model or point me to one?
Thanks in advance
Oh boy, do we ever have 6922 models!
https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/
https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/
Which model are you using? I've had good results with the one developed by Joel Tunnah using Curve Captor. Here is that model, which is based on the Raytheon 6922 datasheet.
Code:
* E88CC LTSpice model
* from Raytheon 6922 datasheet
.subckt e88cc P G K
Bp P K I=(0.06987627466m)*uramp(V(P,K)*ln(1.0+(-0.09315593712)+exp((5.807723862)+(5.807723862)*((29.18392242)+(-191.2885442m)*V(G,K))*V(G,K)/sqrt((51.21619923)**2+(V(P,K)-(25.47300401))**2)))/(5.807723862))**(1.367133435)
Cgp G P 1.4pF
Cgk G K 3.3pF
Cpk P K 1.8pF
.ends e88ccI have been using the Ayumi model. I have no idea if it is the best.
*
BGG GG 0 V=V(G,K)+0.34001426
BM1 M1 0 V=(0.009343174*(URAMP(V(A,K))+1e-10))**-0.49661195
BM2 M2 0 V=(0.75127268*(URAMP(V(GG)+URAMP(V(A,K))/26.621288)+1e-10))**1.9966119
BP P 0 V=0.007130155*(URAMP(V(GG)+URAMP(V(A,K))/35.434921)+1e-10)**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0041180199*V(M1)*V(M2)
BIG IG 0 V=0.0035650775*URAMP(V(G,K))*1.5(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4)
BIAK A K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.0038690245*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK G K I=V(IG)
* CAPS
CGA G A 1.4p
CGK G K 3.3p
CAK A K 1.8p
.ENDS
*
- Generic triode model: ECC88
- Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
- Version 3.10, Generated on Sat Mar 8 22:42:43 2008
- Plate
- | Grid
- | | Cathode
- | | |
BGG GG 0 V=V(G,K)+0.34001426
BM1 M1 0 V=(0.009343174*(URAMP(V(A,K))+1e-10))**-0.49661195
BM2 M2 0 V=(0.75127268*(URAMP(V(GG)+URAMP(V(A,K))/26.621288)+1e-10))**1.9966119
BP P 0 V=0.007130155*(URAMP(V(GG)+URAMP(V(A,K))/35.434921)+1e-10)**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0041180199*V(M1)*V(M2)
BIG IG 0 V=0.0035650775*URAMP(V(G,K))*1.5(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4)
BIAK A K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.0038690245*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK G K I=V(IG)
* CAPS
CGA G A 1.4p
CGK G K 3.3p
CAK A K 1.8p
.ENDS
The Ayumi model is also good in my experience. I default to the Ayumi models most of the time, but run simulations with multiple models if I have them, looking for significant differences that might be model-related. The Ayumi and Tunnah ECC88/E88CC models generally produce similar results.