Hi. I just got LTSpice very recently. I am trying to build a circuit with two 6AW8As, and since its a tube that isn't commonly used for audio, I need to make a model for it in spice (Its a triode / pentode). How do I make a model to reasonably simulate the tube? I have the datasheet handy.

I don't want someone to do it for me, I just want to learn how.

## Create new tube in LTSpice

Code: Select all

```
* 6AW8AT (triode section) LTSpice model
* Modified Koren model (8 parameters): mean fit error 0.115916mA
* Traced by Wayne Clay on 10/19/2014 using Engauge Digitizer
* and Curve Captor v0.9.1
.subckt 6AW8AT P G K
Bp P K I=
+ (0.03960037226m)*uramp(V(P,K)*ln(1.0+(-0.02810705112)+exp((5.049360412)+
+ (5.049360412)*((71.53397072)+(-1430.15241m)*V(G,K))*V(G,K)/sqrt((60.13556928)**2+
+ (V(P,K)-(11.95246653))**2)))/(5.049360412))**(1.130546864)
Cgk G K 3.9p ; 0.7p added (3.2p)
Cgp G P 2.9p ; 0.7p added (2.2p)
Cpk P K 0.52p ; 0.2p added (0.32p)
Rpk P K 1G ; to avoid floating nodes
d3 G K dx1
.model dx1 d(is=1n rs=2k cjo=1pf N=1.5 tt=1n)
.ends 6AW8AT
```