Hi stijena1973
FYI:
My triode model is able to mimic the small initial velocity current. But in electrometer tubes, there are also gridcurrents in the sub-nA-range of interest, where further effects play a role. This area is still uncovered by the known spice model approaches...
All the best, Adrian
FYI:
My triode model is able to mimic the small initial velocity current. But in electrometer tubes, there are also gridcurrents in the sub-nA-range of interest, where further effects play a role. This area is still uncovered by the known spice model approaches...
All the best, Adrian
Code:
* ==============================================================
* 6ES8 LTSpice model
* Koren model (5 parameters): mean fit error 0.405269mA
* Traced by Wayne Clay on 01/01/2019 using Engauge Digitizer 5.2
* and Curve Captor v0.9.1 from Sylvania data sheet.
* ==============================================================
.subckt 6ES8 P G K
Bp P K I=
+ (0.001667389859m)*uramp(V(P,K)*ln(1.0+exp((0.02294225145)+
+ (0.02294225145)*(3057.880457)*V(G,K)/sqrt((0.1158340263k)+
+ (V(P,K))**2)))/(0.02294225145))**(1.268488137)
Cgp G P 2.55p ; 0.7p added (1.85)
Cgk G K 4.0p ; 0.7p added (3.3p)
Cpk P K 0.38p ; 0.2p added (0.18p)
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 6ES8
Code:
* ==============================================================
*
* Generic triode model: ECC189_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Dec 25 13:38:23 2018
* Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT ECC189_AN A G K
BGG GG 0 V=V(G,K)+0.32201735
BM1 M1 0 V=(0.35943878*(URAMP(V(A,K))+1e-10))**-21.749142
BM2 M2 0 V=(0.06451851*(URAMP(V(GG)+URAMP(V(A,K))/2.602617)+1e-10))**23.249142
BP P 0 V=0.0091825815*(URAMP(V(GG)+URAMP(V(A,K))/40.339075)+1e-10)**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*1.6647528e+23*V(M1)*V(M2)
BIG IG 0 V=0.0045912908*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)-(0.0049348506*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK G K I=V(IG)
* CAPS
CGA G A 1.9p
CGK G K 3.5p
CAK A K 1.7p
.ENDS
There is not much on the topic in the internet. The only mention of the component currents I saw is in "Electrometer tubes, part 1" by Dolezalek. But if the curve is known from the datasheet, maybe some kind of a look-up table is possible?
6N21B model
Hi guys! In case anyone needs model for Russian 6N21B (6Н21Б) triode, here it is, created by myself using model paint tools:
Hi guys! In case anyone needs model for Russian 6N21B (6Н21Б) triode, here it is, created by myself using model paint tools:
Code:
.SUBCKT 6N21B 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=2.7P CGP=0.6P CCP=1.4P RGI=2000
+ MU=113.16 KG1=585 KP=276 KVB=225 VCT=0.912 EX=1.526
* Vp_MAX=320 Ip_MAX=14 Vg_step=0.5 Vg_start=0 Vg_count=8
* Rp=4000 Vg_ac=55 P_max=1 Vg_qui=-48 Vp_qui=300
* X_MIN=70 Y_MIN=11 X_SIZE=667 Y_SIZE=593 FSZ_X=2578 FSZ_Y=1458 XYGrid=true
* showLoadLine=y showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y
* showIg1=n gridLevel2=n isInputSnapped=n
* XYProjections=n harmonicPlot=n dissipPlot=n
*----------------------------------------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G ; TO AVOID FLOATING NODES
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; POSITIVE GRID CURRENT
R1 2 5 {RGI} ; POSITIVE GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
*$Yes, I understand.. I'll make one myself one day (CK5886).
Any suggestions which method /package to use?
The only Heptode model I know is from Derk Reefman. He posted a beta version of the ECH81 (heptode part) in the LTspice google group:Google Groups
I hope that may help you.
All the best, Adrian
I hope that may help you.
All the best, Adrian
