6AS7 Model

[bpetcavage]

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.

 

[yagoolar]

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

 

[bpetcavage]

Thanks!

 

[yagoolar]

That is no heater model.


"Jeśli nie wiesz dokąd zmierzasz, każda droga jest równie dobra"

 

[kees52]

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

 

[Aiace]

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

 

[kees52]

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.

 

[kees52]

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 ;-)

 

[atmasphere]

What are you trying to simulate? I've done a lot of work with 6AS7 based Circlotron circuits- what do you need to know?

 

[kees52]

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.

 

[atmasphere]

You're still going to need a lot of drive at the input of the 6AS7. Its mu is only 2.

 

[kees52]

but less then with cathode follower, a plate follower simulates a lot better.

But I only play with it because I like that I have not expetations of it, but learn from it, a 300b can also drive mosfets and it looks good on the amp, I am very interested in driving with big tubes the mosfet capacitance to see what sonic improvement there is, or not or maybe it is overkill and stuck with the 6N6P.

regards

 

[Aiace]

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 ;-)

The error seems related to the heather. Generally you don't need to simulte the heaters, so set these pins as unconnected

 

[kees52]

The error seems related to the heather. Generally you don't need to simulte the heaters, so set these pins as unconnected

Yes I have discovered, thanks for your kindness all here.

 

[Sgkho249]

I've had a diy 6as7 from a friend for about 9mths. Its a power amp with 10+ watts, very nice sounding amp. I wish to build one myself if I can.
Happy listening, hope you enjoy it.

 

[kees52]

I've had a diy 6as7 from a friend for about 9mths. Its a power amp with 10+ watts, very nice sounding amp. I wish to build one myself if I can.
Happy listening, hope you enjoy it.

I have now playing a dc coupled hybride, have voltage raised to 450 for the mustage 6H9C and use nice russian paper in oil capacitors.

highervoltage6H9C - YouTube

Only one detail, playing mp3 on amps like this made them bad sounding, mp3 plays oke on bad amps, so youtube is no different.

 

[kees52]

You're still going to need a lot of drive at the input of the 6AS7. Its mu is only 2.

I did this it is not the circlotron but normal source follower. use of two mosfet mu stages, this will be able to drive a lot of capacitance.

 

[kees52]

Hi There

Have ypu also the multisim models for ecc99, 6N6P, 6C33, I have them but not working well..

thanks in advance and happy newyear

 

[Electronic Memory]

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

This model is giving me errors. It will run for a bit then crap out. If anyone knows how to fix this it would be a great help as I don't know spice or how to trouble shoot errors in multisim.

 

[yagoolar]

The error looks to me u2 part has incorrect description (RefDes) in MultiSim. It refers to non existing model definition "33" or "21". Search for those numbers and change to the right model name. I guess there is nothing wrong with the model itself.