Some time ago I got hold of a nice stash of Telefunken EL152. These German pentodes are amazing. After playing with the RL12P35P and then obviously GU-50 (which is a copy of the LS-50), the EL152 was a nice valve to have at hand as it’s actually the LS-50 in a different bottle.
The B-10V socket is quite tricky as it seems like it was designed for the EL/FL-152 and similar Telefunken valves. Anyhow, managed to get some new ceramic ones to trace the curves and generate a Spice model. Hope you find this useful.
Here’s the model using Derk’s tool:
LT Spice models
Pentode model is below and also here: EL152-pentode-model:
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.SUBCKT EL152-pentode 1 2 3 4 ; A G2 G1 C;
* Extract V3.000
* Model created: 23-Oct-2020
*
* Curves traced and Model developed by Alejandro Moglia
* (c) 2020 by Bartola Ltd. UK
* For DIY Audio Use Only
* www.bartola.co.uk/valves email: valves@bartola.co.uk
*
X1 1 2 3 4 PenthodeD MU= 5.4 EX=1.390 kG1= 707.4 KP= 32.3 kVB = 5122.1 kG2=46214.5
+ Ookg1mOokG2=.14E-02 Aokg1=.45E-06 alkg1palskg2=.14E-02 be= .07 als= 50.58 RGI=2000
+ CCG1=10.0P CCG2 = 0.0p CPG1 = 0.11p CG1G2 = 0.0p CCP=14.5P ;
.ENDS
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.SUBCKT PenthodeD 1 2 3 4; A G2 G1 C
*
* NOTE: LOG(x) is base e LOG or natural logarithm.
* For some Spice versions, e.g. MicroCap, this has to be changed to LN(x).
*
RE1 7 0 1MEG ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1 7 0 VALUE=
+{V(2,4)/KP*LOG(1+EXP(KP*(1/MU+V(3,4)/SQRT(KVB+V(2,4)*V(2,4)))))}
E2 8 0 VALUE = {Ookg1mOokG2 + Aokg1*V(1,4) - alkg1palskg2/(1 + be*V(1,4))}
G1 1 4 VALUE = {0.5*(PWR(V(7),EX)+PWRS(V(7),EX))*V(8)}
G2 2 4 VALUE = {0.5*(PWR(V(7),EX)+PWRS(V(7),EX))/KG2 * (1+ als/(1+be*V(1,4)))}
RCP 1 4 1G ; FOR CONVERGENCE A - C
C1 3 4 {CCG1} ; CATHODE-GRID 1 C - G1
C4 2 4 {CCG2} ; CATHODE-GRID 2 C - G2
C5 2 3 {CG1G2} ; GRID 1 -GRID 2 G1 - G2
C2 1 3 {CPG1} ; GRID 1-PLATE G1 - A
C3 1 4 {CCP} ; CATHODE-PLATE A - C
R1 3 5 {RGI} ; FOR GRID CURRENT G1 - 5
D3 5 4 DX ; FOR GRID CURRENT 5 - C
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS PenthodeD
The triode model is below and also here:EL152-triode-model
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.SUBCKT EL152-triode 1 2 3; A G C;
* Extract V3.000
* Model created: 23-Oct-2020
*
*
* Curves traced and Model developed by Alejandro Moglia
* (c) 2020 by Bartola Ltd. UK
* For DIY Audio Use Only
* www.bartola.co.uk/valves email: valves@bartola.co.uk
*
X1 1 2 3 TriodeK MU= 5.43 EX=1.423 KG1= 707.4 KP= 32.3 KVB= 5122. RGI=2000
+ CCG=0.0P CGP=0.0P CCP=0.0P ;
.ENDS
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.SUBCKT TriodeK 1 2 3; A G C
*
* NOTE: LOG(x) is base e LOG or natural logarithm.
* For some Spice versions, e.g. MicroCap, this has to be changed to LN(x).
*
E1 7 0 VALUE=
+{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G
G1 1 3 VALUE={0.5*(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID-PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; FOR GRID CURRENT
R1 2 5 {RGI} ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS TriodeK