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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 22nd September 2017, 06:44 PM   #1471
smoking-amp is offline smoking-amp  United States
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I just re-checked the two RCA 6CB6A/6CF6 tubes I have here, and I get triode (g3 connected to cathode, g2 conn. to plate) Mu of 42 at around 5 mA and Mu of 45 around 12 mA. This is somewhat higher than the datasheet derived value of 36 Mu. Probably higher gm1 here than average spec. New tubes usually are above the average. Connecting g3 to g2 and plate lowers the Mu about 2%, so respective Mu about 41 and 44 then.

6CF6 seems to be identical to 6CB6A.

Some burn-in probably would lower the gm and Mu figures down to spec.

Edit: seeing the 6CB6 pentode trace (130 Vg2 and -0.3Vg1 steps) over the datasheet curves (125Vg2) would indicate that the grid2 gm2 is not quite as high for the RCA tubes, so that would explain some of the higher Mu factors seen here.

Last edited by smoking-amp; 22nd September 2017 at 06:52 PM.
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Old 23rd September 2017, 09:07 AM   #1472
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
@smoking-amp & Koonw - ok, I generated a pentode model for the 6CB6 using the traced triode curves, and here is the resultant characteristic compared to the datasheet, as you can see, the cuves are far from close, even if we factor in the tube tolerance and the error that was introduced by the methodology used...

Screenshot - 9_23_2017 , 9_49_27 AM.png
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Old 23rd September 2017, 02:16 PM   #1473
d888sp4 is offline d888sp4  Italy
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I'm looking for a possible (best) competitor of 6GU5.
I need a tube with similar mu.
Do you know 6EW6 what mu might have in triode connection?
This is the reason I was looking for the spice model...

Thank you.
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Old 23rd September 2017, 02:49 PM   #1474
jazbo8 is offline jazbo8
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I don't think 6EW6's triode mu is as high as the 6GU5, may be just half.
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Old 24th September 2017, 05:02 AM   #1475
Koonw is offline Koonw
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Quote:
Originally Posted by smoking-amp View Post
I just re-checked the two RCA 6CB6A/6CF6 tubes I have here <snip>
I'm sorry to bother you again, true the model traced by CurveCaptor shows that 6cb6 triode mode has a gain of 36, while existing Asymi model is 23. I use Paint tool model gain is near 20. There is no way I can achieve a gain of 36 using your pentode or original pentode curve. There are other triode plots on the net such as 6f12p, I can manage to find a close fit, but not this one. So could it your triode plot is wrong scale or missed named (not belong 6cb6), please advise again.

Last edited by Koonw; 24th September 2017 at 05:07 AM.
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Old 24th September 2017, 09:20 AM   #1476
d888sp4 is offline d888sp4  Italy
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About triode 6SF5/12SF5 anyone has spice model ?
This tube look very linear and with good gain.
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Old 24th September 2017, 10:26 AM   #1477
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Default 6SF5 SPICE Model

Code:
*
* Generic triode model: 6SF5_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Dec 13 18:55:08 2014
*               Plate
*               | Grid
*               | | Cathode
*               | | |
.SUBCKT 6SF5_AN A G K
BGG   GG   0 V=V(G,K)+0.99999997
BM1   M1   0 V=(0.031634481*(URAMP(V(A,K))+1e-10))**-0.46975888
BM2   M2   0 V=(0.76151452*(URAMP(V(GG)+URAMP(V(A,K))/7.5387827)+1e-10))**1.9697589
BP    P    0 V=0.00039029593*(URAMP(V(GG)+URAMP(V(A,K))/9.8997228)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00022622154*V(M1)*V(M2)
BIG   IG   0 V=0.00019514796*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)-(0.00025575454*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 2.4p
CGK   G    K 4p
CAK   A    K 3.6p
.ENDS
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Old 24th September 2017, 12:08 PM   #1478
d888sp4 is offline d888sp4  Italy
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Thanks !
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Old 24th September 2017, 03:35 PM   #1479
maouna is offline maouna  Greece
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Hello.Can someone post Ltspice model and symbol .asy for 6j1 or 5654W tubes? i want to simulate a preamp i bought from ebay.
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Old 24th September 2017, 04:22 PM   #1480
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Always search the thread before you request for a SPICE model.

Vacuum Tube SPICE Models
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