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Old 2nd December 2011, 08:39 AM   #1
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Default 6AS7 Model

Does anyone have a PSpice model for the 6AS7? I'm using LTSPice and the embedded simulation software in Altium.

Working on my first OTL. Chose this tube because of its relative cheapness and availability and the octal socket. The low grid impedance is practically like driving a wire though and want to make sure I have some good simulation data before hacking up a breadboard.
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Old 2nd December 2011, 11:16 AM   #2
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Voila
.SUBCKT 6AS7_6080 A G K
XV1 A G K TRIODENH
+PARAMS: LIP= 1 LIF= 0.01 RAF= 0.0058 RAS= 0.7 CDO= 0
+ RAP= 0.035 ERP= 1.5
+ MU0= 2.05 MUR= 0.0017 EMC= 0.0005
+ GCO= 0 GCF= 0
+ CGA=1.10E-11 CGK=8.00E-12 CAK=3.00E-12
.ENDS
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Old 10th December 2011, 08:12 AM   #3
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Thanks!
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Old 11th December 2011, 09:23 PM   #4
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That is no heater model.


"Jeśli nie wiesz dokąd zmierzasz, każda droga jest równie dobra"
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Old 26th December 2011, 06:08 PM   #5
kees52 is offline kees52  Netherlands
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Location: Sprang-capelle Holland.
I have tryed this for multisim, but no id did not work, only faults like refdes U3 .

I have almost not a model working in these simulator, why I don,t now but it is just buggy
of its own, and the pcb maker ultiboard is a lot more worse, a lot of components ware wrong, but it works very easy that is what I like.

But maybe here somebody know why it gives that errrors,..

regards
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Old 26th December 2011, 06:58 PM   #6
Aiace is offline Aiace  Italy
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I have multisim too and I use this:


*-----------------------------------------------------------------------
* Filename: SV6AS7.inc V1 25/8/97
* Simulator: PSpice
* Device type: Power triode
* Device model: Svetlana 6AS7
*
* Author: Duncan Munro
* Date: 25/8/97
* Copyright: (C)1997-2000 Duncan Amplification
*
* The following parameters are not modelled:
*
* (1) Heater is not modelled.
*
* (2) Grid current is not modelled.
*
* Please note that this model is provided "as is" and
* no warranty is provided in respect of its suitability
* for any application.
*
* This model is provided for educational and non-profit use.
*
* Email queries to postmaster@duncanamps.com
*
* Pins A Anode
* G Grid
* K Cathode
*
*-----------------------------------------------------------------------
.SUBCKT 6AS7 A G K
*
* Calculate reduction in mu at large negative
* grid voltages
*
Emu mu 0 VALUE={PWRS(V(G,K),0.88)}
*
* Emission reduction due to low Va
*
Eel el 0 VALUE={ATAN(LIMIT(V(A,K),0,1E6)/10)}
*
* Calculate change in shape with reducing grid voltage
*
Eshape shape 0 VALUE={(220+V(G,K))/220}
*
Egs gs 0 VALUE={LIMIT(V(A,K)+V(mu)*2.8,0,1E6)}
Egs2 gs2 0 VALUE={PWRS(V(gs)*V(shape),1.5)*410E-6}
Ecath cc 0 VALUE={V(gs2)*V(el)}
*
* Calculate anode current
*
Ga A K VALUE={V(cc)}
*
* Capacitances
*
Cgk G K 8p
Cga A G 11p
Cak A K 3p


.ENDS



I hope this can help you
Aiace
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Old 27th December 2011, 03:16 PM   #7
kees52 is offline kees52  Netherlands
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Thanks! Are there things I have watch for as I will use models for multisim?

a lot of them on the internet don,t work

regards and happy days.
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Old 27th December 2011, 04:51 PM   #8
kees52 is offline kees52  Netherlands
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I have tryed it, it works but report faults see picture.

That I have seen more and don,t now what to do with it.

Don,t mind, have found it ;-)
Attached Images
File Type: gif faults multisim.gif (8.8 KB, 427 views)

Last edited by kees52; 27th December 2011 at 04:56 PM.
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Old 27th December 2011, 06:10 PM   #9
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What are you trying to simulate? I've done a lot of work with 6AS7 based Circlotron circuits- what do you need to know?
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Old 27th December 2011, 06:57 PM   #10
kees52 is offline kees52  Netherlands
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I am busy with a hybride version of circlotron mosfets who is driven by a long tail fasesplitter made from the 6as7 as a test after read something about that on the internet a while ago.

the big drive of the 6as7 gives a good way to drive the mosfet capacitances without losing bandwith, it simulates 5 hz to 1 Mhz distortion 1.2 procent full power most second harmonic, a tube sound is what I try to get.

A cathodefollower with the 6as7 gives to much loss, so now I use anode follower but the mosfets are dc coupled to them and the sound you here on the link is a white cathode follower with a 6N6P.

a normal hybride dc coupled 6n6p and mu stage 6h9c you can listen here, pc was direct coupled to amp output 1 volt to pc.

6H9C-mustage-0.7mA-idle.mpg - YouTube

some patient while loading, something is wrong there on youtubate.

Last edited by kees52; 27th December 2011 at 07:01 PM.
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