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-   -   Vacuum Tube SPICE Models (http://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models.html)

euro21 30th November 2013 05:27 PM

Quote:

Originally Posted by needtubes (http://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3721856.html#post3721856)
Found some here, but they do not work with my LTSpice generic TRIODE model

Please read this: :: View topic - Drop Down Menus for selecting your tube

Zen Mod 30th November 2013 05:52 PM

Quote:

Originally Posted by jazbo8 (http://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3722526.html#post3722526)
Here you go...:)

....

thank you !

jackinnj 30th November 2013 05:58 PM

http://www.tech-diy.com/SPICE/Tube_SPICE/RS1003.gif

RajkoM 1st December 2013 01:15 PM

2 Attachment(s)
To create your own spice model, the first step is the determination of MU from a reliable diagram. Diagram must include Ug=0V curve.
I took Telefunken pentode and triode diagrams just for example.

The formula for calculation is:
MU=(Ua-Ua min) / Ug

For pentode, the line passes through operating point and the END of knee @ Ug = 0V, as you can see.

kevinkr 1st December 2013 04:03 PM

Thanks Raj,
This will allow us to determine mu for the model and then work solely with the other parameters - should make curve fitting a lot easier.

I built a prototype of my new phono stage (the muscovite mini) using a 6Z9P-E pentode in the front end and was gratified at how close the measured performance was compared with the spice model predictions. It even sounds good.. lol (The model is a slightly modified version of the one you gave me, kg2 adjusted to reflect real world screen currents.)

RajkoM 1st December 2013 05:57 PM

1 Attachment(s)
Quote:

Originally Posted by kevinkr (http://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3723393.html#post3723393)
Thanks Raj,
This will allow us to determine mu for the model and then work solely with the other parameters - should make curve fitting a lot easier.

I built a prototype of my new phono stage (the muscovite mini) using a 6Z9P-E pentode in the front end and was gratified at how close the measured performance was compared with the spice model predictions. It even sounds good.. lol (The model is a slightly modified version of the one you gave me, kg2 adjusted to reflect real world screen currents.)


I saw, nice.
I know a few DIYers who use E180F in RIAA preamp.
One of them has E180F in pentode mode as input, and E180F triode mode on output (LED bias, CCS mu-out). He is very happy with sound. I adapted the Russian Teflon capacitors for his RIAA RC network. Simply unwrapped AL/Teflon foils to the required value. See atach.

Zen Mod 2nd December 2013 02:01 PM

1 Attachment(s)
well , I'm dumb .... but that's hardly anything new ..... :rofl:

what I'm doing wrong ?

current from PSU to tube is 8A , but I'm still puzzled where is it going :clown:

RajkoM 2nd December 2013 02:43 PM

Quote:

Originally Posted by Zen Mod (http://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3724392.html#post3724392)
well , I'm dumb .... but that's hardly anything new ..... :rofl:

what I'm doing wrong ?

current from PSU to tube is 8A , but I'm still puzzled where is it going :clown:


Kad tvoj atas proslijedim u LTspice, sve je korektno. Radna tacka: 395V/99,4mA/-11,93V,
Tako da trenutno ne bih znao.

translation:
When your atach I put in LTspice everything works correctly.
So currently I do not know ....

RajkoM 2nd December 2013 02:47 PM

I think I know what it is. In Ayumis model put to be A G K, not P G K.

It should be like this:

. Subckt SRS511_T A G K


syntax, a common problem in LT spice

Zen Mod 2nd December 2013 03:37 PM

tnx Rajko

can you zip and attach here functional sim , along with all needed files ?

even when I change that line ( as you wrote in #109) there is something wrong

I know , main problem is still - short circuit between headphones of operator :rofl:


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