* 12AT7 Triode PSpice Model 8/96, Rev. 1.0 (fp)
*
* -------------------------------------------------------------------
* This model is provided "as is", with no warranty of any kind,
* either expressed or implied, about the suitability or fitness
* of this model for any particular purpose. Use of this model
* shall be entirely at the user's own risk.
*
* For a discussion about vacuum tube modeling please refer to:
* W. Marshall Leach, jr: "SPICE Models for Vacuum-Tube Amplifiers";
* J. Audio Eng. Soc., Vol 43, No 3, March 1995.
* -------------------------------------------------------------------
*
* This model is valid for the following tubes:
* 12AT7/ECC81, 6AB4/EC92, 6201, 6679;
* at the following conditions:
* Plate voltage : 0..500V
* Grid voltage : 0..-8V
* Cathode current: 0..30mA
*
* Modified DM 28/4/97:
*
* 1 Model altered to prevent anode draw at Va < 5V. E2 is the
* anode draw multiplier in the range 0..1
*
*
* Connections: Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT 12AT7 P G K
E1 2 0 VALUE={V(P,K)+63.19*V(G,K)}
E2 3 0 VALUE={LIMIT{V(P,K)/5,0,1}}
R1 2 0 1.0K
Gp P K VALUE={V(3)*6.717E-6*(PWR(V(2),1.5)+PWRS(V(2),1.5))/2}
Cgk G K 2.2P
Cgp G P 1.5P
Cpk P K 0.5P
.ENDS 12AT7