Muttley600 said:
Just watchin' and learnin' from ya'll and playin' with tubes here.
I've got a feeling that TINA (maybe other sims as well) just treat tubes (rectifiers like the 5U4GB) as high voltage, relatively high current solid state diodes. Maybe not. Here's the pspice definition (note the stuff NOT modelled):
--------------------------------------------------------------
* 5U4GB pspice rectifier model
*
* The following parameters are not modelled:
*
* (1) Filament and filament warmup time
* (2) Reverse voltage breakdown
* (3) Saturation
* (4) Inter-electrode capacitance
*
* Please note that this model is provided "as is" and
* no warranty is provided in respect of its suitability
* for any application.
*
* 5U4GB maximum ratings:
*
* PIV 1550V
* Max in 550V RMS
* Ia pk 1000mA repetitive (4600mA transient)
*
*
* .----- Anode
* | .--- Cathode
* | |
.SUBCKT 5U4GB A K
GP A K VALUE={7.55E-4*(PWR(V(A,K),1.5)+PWRS(V(A,K),1.5))/2}
.ENDS 5U4GB
----------------------------------------------------------------------
I'm going to see what they do with a triode. And here it is:
----------------------------------------------------------------------
* 12AU7A 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:
* 12AU7A/ECC82, 6680, 6C4/EC90, 12DW7/7247 (Unit #2);
* at the following conditions:
* Plate voltage : 0..400V
* Grid voltage : 0..-18V
* Cathode current: 0..30mA
*
*
* Connections: Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT 12AU7A P G K
E1 2 0 VALUE={V(P,K)+18.28*V(G,K)}
R1 2 0 1.0K
Gp P K VALUE={10.88E-6*(PWR(V(2),1.5)+PWRS(V(2),1.5))/2}
Cgk G K 1.6P
Cgp G P 1.5P
Cpk P K 0.5P
.ENDS 12AU7A
---------------------------------------------------------------------------
This one
does include inter-electrode capacitances, so I guess they really do model tubes.
I don't know how to edit or create a pspice model. Doesn't look all that complicated but, as I said, just don't know how. Definitely looking up the Leach book referenced above.