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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 19th October 2017, 07:15 PM   #1511
dirkwright is offline dirkwright  United States
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It works! Thanks so much!
Dirk
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Old 20th October 2017, 05:00 PM   #1512
rongon is offline rongon  United States
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Vacuum Tube SPICE Models
I'm wondering if there is a 6JC6 pentode model out there anywhere. I can't seem to find one. smoking_amp did post a set of triode curves in another thread:

2 mA/div Vert., 50 V/div. Horiz.

6JC6 triode curves, 0.5 V steps:
Click the image to open in full size.

6JC6 pentode curves 0.15V steps, 92 Vg2
Click the image to open in full size.

Here's the best data sheet I could find for 6JC6:
http://rtellason.com/tubedata/6JC6.PDF
https://frank.pocnet.net/sheets/049/6/6JC6.pdf

I can't find much data on this tube type. I'm hoping a model can be put together from these scraps. Thanks in advance.
--

Last edited by rongon; 20th October 2017 at 05:07 PM.
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Old 21st October 2017, 12:41 AM   #1513
rongon is offline rongon  United States
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Vacuum Tube SPICE Models
Going back to the well... I hope not too many times.

It turns out there's an interesting high mu RF triode called 6J4 (not to be confused with the Russian 6J4P pentode). American 6J4 or 6J4W is the same as 8532 or 8532W. This looks like a very capable little tube. Might be good as the input stage in a phono preamp.

Fortunately, there is a data sheet with triode curves.
https://frank.pocnet.net/sheets/049/8/8532.pdf

I found only one model out there on the innerwebs, but it doesn't look promising to me. Here is that one:

Code:
* 6J4 RF Triode LTspice model 
*
.subckt 6J4 1 6 3
+ params: mu=94.8 ex=1.274 kg1=103 kp=153 kvb=792 rgi=2000 vct=.122
+ ccg=5.5p cgp=4.0p ccp=5.0p
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= {(pwr(v(7),ex)+pwrs(v(7),ex))/kg1}
rcp 1 3 1g
c1 2 3 {ccg}
c2 1 2 {cgp}
c3 1 3 {ccp}
r1 2 5 {rgi}
v1 5 6 {vct}
d3 6 3 dx
.model dx d(is=1n rs=1 cjo=1pf tt=1n)
.ends
Is that one good enough to be used with confidence?
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Old 21st October 2017, 12:52 AM   #1514
rongon is offline rongon  United States
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I didn't link to the full-size jpg of the 6JC6 pentode curves. Those are here:
Click the image to open in full size.
--
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Old 21st October 2017, 04:35 AM   #1515
cogsncogs is offline cogsncogs  United States
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Default 6J4WA/8532 LTspice model

@rongon, try this one, it's fairly close.
Code:
* 6J4WA/8532 LTSpice model
* Koren model (5 parameters): mean fit error 0.307023mA
* Traced by Wayne Clay on 10/21/2017 using Curve Captor v0.9.1 and
* Engauge Digitizer from RCA 6J4WA/8532 datasheet
.subckt 6J4WA  P G K
    Bp  P K  I=
+ (0.06966747418m)*uramp(V(P,K)*ln(1.0+exp((2.926315606)+
+ (2.926315606)*(72.64172476)*V(G,K)/sqrt((0.1832532151k)+
+ (V(P,K))**2)))/(2.926315606))**(1.252675985)
  Cgp G P 4.7p ; 0.7p added (4.0p)
  Cgk G K 6.2p ; 0.7p added (5.5p)
  Cpk P K 0.44p ; 0.2p added (0.24p)
  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 6J4WA
Attached Images
File Type: png 6j4wa-k5.png (34.1 KB, 148 views)
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Old 21st October 2017, 05:08 AM   #1516
rongon is offline rongon  United States
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That works great Wayne. Thanks!
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Old 21st October 2017, 08:18 AM   #1517
artosalo is offline artosalo  Finland
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Does spice model for Osram N43 exist ?
Close to EL84 but not exactly.
Attached Files
File Type: pdf N43.pdf (89.1 KB, 14 views)
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Old 21st October 2017, 04:23 PM   #1518
artosalo is offline artosalo  Finland
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How about EBL21 ? It seems to be almost similar to N43.
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Old 25th October 2017, 02:41 PM   #1519
dirkwright is offline dirkwright  United States
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Default 6AF4, 6T4, 6AN4, 6DX4 models?

I'm sorry, I can't find any spice models for the 6AF4 or 6T4. It looks like these are all equivalents, but I have not studied them in detail. If anyone has a model for the 6AF4 or 6T4, I'd be really happy to have it, thanks.
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Old 25th October 2017, 03:02 PM   #1520
dirkwright is offline dirkwright  United States
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Also, a model of the 12B4 would be appreciated, thanks.
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