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Old 22nd May 2018, 02:57 PM   #1681
rongon is offline rongon  United States
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Default Can I make a request? Russian GU15 - Triode model desired

I searched high and low for a model, found this on diyAudio, Posted By matejsirk:

Code:
**** GU15TRIODE ******************************************
* Created on 07/30/2014 10:24 using paint_kit.jar 
* Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively
* Curves image file: gu15triode.gif
* Data source link: 
*----------------------------------------------------------------------------------
.SUBCKT GU15T 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=3P CGP=1.4P CCP=1.9P RGI=2000
+ MU=7.81 KG1=900 KP=86 KVB=297 VCT=0.206 EX=1.34 
* Vp_MAX=600 Ip_MAX=150 Vg_step=5 Vg_start=0 Vg_count=14
* Rp=4000 Vg_ac=55 P_max=18.8 Vg_qui=-48
* X_MIN=110 Y_MIN=47 X_SIZE=1306 Y_SIZE=785 FSZ_X=1936 FSZ_Y=1176 XYGrid=false
*----------------------------------------------------------------------------------
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 
*$
I haven't tried it yet.

I did find triode plate curves; hopefully they'll be useful (attached).

Incomplete data sheet

I can't seem to find inter-electrode capacitances in any data sheets, but matejsirk used CCG=3P CGP=1.4P CCP=1.9P.

I hope that's enough info for a good model. Or perhaps the model above is all that is needed; in which case, add it to the collection!

--
Attached Images
File Type: png GU15_triode_platecurves.png (238.4 KB, 65 views)
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Old 23rd May 2018, 07:27 AM   #1682
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Default GU15 Pentode SPICE Model

Code:
*
* Generic pentode model: GU15_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Wed May 23 09:26:22 2018
*               Anode
*               | Screen Grid
*               | |  Control Grid
*               | |  |  Cathode
*               | |  |  |
.SUBCKT GU15_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.8652221
BM1   M1   0 V=(0.019769659*(URAMP(V(G2,K))+1e-10))**-0.23140853
BM2   M2   0 V=(0.86634666*(URAMP(V(GG)+URAMP(V(G2,K))/6.7605282)))**1.7314085
BP    P    0 V=0.0011519635*(URAMP(V(GG)+URAMP(V(G2,K))/7.8034908))**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00074748356*V(M1)*V(M2)
BIG   IG   0 V=0.00057598173*URAMP(V(G1,K))**1.5*(URAMP(V(G1,K))/(URAMP(V(A,K))+URAMP(V(G1,K)))*1.2+0.4)
BIK2  IK2  0 V=V(IK,IG)*(1-0.4*(EXP(-URAMP(V(A,K))/URAMP(V(G2,K))*15)-EXP(-15)))
BIG2T IG2T 0 V=V(IK2)*(0.960348889*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.039651111)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+1150)/(URAMP(V(G2,K))+1150)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.00080436341*(URAMP(V(A,K))+URAMP(URAMP(V(G2,K))-URAMP(V(A,K))))**1.5))
BIP   IP   0 V=URAMP(V(IK4,IG2T)-URAMP(V(IK4,IG2T)-(0.00080436341*URAMP(V(A,K))**1.5)))
BIAK  A    K I=V(IP)+1e-10*V(A,K)
BIG2  G2   K I=URAMP(V(IK4,IP))
BIGK  G1   K I=V(IG)
* CAPS
CGA   G1  A  0.16p
CGK   G1  K  6.6p
C12   G1  G2 4.4p
CAK   A   K  13p
.ENDS
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Old 23rd May 2018, 07:53 PM   #1683
rongon is offline rongon  United States
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Yowza!

Thank you kind sir.
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Old 24th May 2018, 10:34 AM   #1684
jazbo8 is offline jazbo8
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You are welcome, let us know how it works out in your design.
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Old 24th May 2018, 05:32 PM   #1685
rongon is offline rongon  United States
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I did a quick sim using this model (and the previous one) in a PP amp. I was hoping triode-wired GU15 might work as a replacement for expensive 2A3 triodes. Alas, it looks like the GU15 wired triode likes to make a lot more 3rd harmonic than the 2A3 -- or at least judging by the modeled circuits.

I tried various impedance OPT models. It seems the GU15-Triode works better into high primary impedance loads, like 10k:VC. Of course my real-life OPT collection contains only 5k and 6.6k items. I just knew I should have held onto those old UTC LS63 OPTs I sold a few years back. (Even though I did get a lot of money for them.)

At any rate, thank you very much for the model. I'll try to figure out a circuit that will work well with them, someday. But for now, working with the model kept me from going shopping for tubes I don't really need!
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Old 24th May 2018, 09:13 PM   #1686
kevinkr is offline kevinkr  United States
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Vacuum Tube SPICE Models
There is a Sovtek monoplate 2A3 which isn't very expensive and in prior experience was a decent quality and sounding tube. This probably isn't as cheap as you'd hoped at $49 each.

This discussion is OT for this thread, perhaps we should start another and move posts over?
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Old 24th May 2018, 09:23 PM   #1687
rongon is offline rongon  United States
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Sorry, I'm done. But thanks for the info on the Soviet 2A3. Feel free to delete any off-topic posts you deem appropriate. All's good with me...
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