Re: [LAD] simulating analog audio devices part II

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To: The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Friday, June 8, 2007 - 8:02 am

Hi,

Some time ago I did a sim using LTSpice
(http://www.linear.com/designtools/software/) under Wine of a Carvin
Legacy tube amp. LTSpice was the only program that had wav in/out and
would run on Linux at the time I tried this.
The schematic for the amp is here
(http://carvinmuseum.com/pdf/amps/VL100%20&%20VL212%20Legacy%20Amp.pdf).
It's a complex beast that ngspice would have lots of troubles
simulating because of the infamous "floating nodes" and other quirks.
Everything is included into the sim, preamp, phase splitter, output
valves , output transformer and even the model of a greenback speaker.
Naively, I haven't set the sim time step to the a sampling freq
related number, nevertheless it sounds Ok to me, I dont know how
LTSpice deals with transient sims involving wav files in details.

The ogg for the sim is here:

http://siliconjoe.googlepages.com/legacy-swcadiii-1-cab-reverb-delay.ogg

I played a bounch of fast licks to have the transient sim finish
before the universe will collapse, yeah you guessed it it's pretty
slow... I think it took 1 day to finish on an AthlonXP 2800+...
Now days I am messing around with GNUCap and QUCS (http://qucs.sf.net)
to which I just ported my first tube model whose plate voltage/grid
current curves look like that:

http://siliconjoe.googlepages.com/Schermata.png

Hopefully a way to inject wav files in both GNUCap and QUCS will come
true as they both seem better than spice derived programs.

Cheers,

-Giuseppe

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Messages in current thread:
[LAD] simulating analog audio devices part II, Robin Gareus, (Wed Jun 6, 5:55 pm)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Fri Jun 8, 12:37 am)
Re: [LAD] simulating analog audio devices part II, Robin Gareus, (Mon Jun 18, 11:58 am)
Re: [LAD] simulating analog audio devices part II, Giuseppe Zompatori, (Fri Jun 8, 8:02 am)
Re: [LAD] simulating analog audio devices part II, Robin Gareus, (Mon Jun 18, 12:06 pm)
Re: [LAD] simulating analog audio devices part II, Giuseppe Zompatori, (Mon Jun 18, 7:48 pm)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Mon Jun 18, 3:06 pm)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Sun Jun 17, 11:56 pm)
Re: [LAD] simulating analog audio devices part II, Dominique Michel, (Mon Jun 18, 9:58 pm)
Re: [LAD] simulating analog audio devices part II, Giuseppe Zompatori, (Mon Jun 18, 7:59 pm)
Re: [LAD] simulating analog audio devices part II, Dominique Michel, (Mon Jun 18, 10:25 pm)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Tue Jun 19, 4:34 am)
Re: [LAD] simulating analog audio devices part II, Giuseppe Zompatori, (Tue Jun 19, 7:52 am)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Tue Jun 19, 10:52 am)
Re: [LAD] simulating analog audio devices part II, Dominique Michel, (Tue Jun 19, 6:01 pm)
Re: [LAD] simulating analog audio devices part II, porl sheean, (Wed Jun 20, 1:01 am)
Re: [LAD] simulating analog audio devices part II, Stefano D'Angelo, (Wed Jun 6, 11:57 pm)
Re: [LAD] simulating analog audio devices part II, Robin Gareus, (Thu Jun 7, 7:20 am)
Re: [LAD] simulating analog audio devices part II, Stefano D'Angelo, (Thu Jun 7, 8:26 am)
Re: [LAD] simulating analog audio devices part II, Robin Gareus, (Thu Jun 7, 10:06 am)
Re: [LAD] simulating analog audio devices part II, Stefano D'Angelo, (Thu Jun 7, 5:27 pm)
Re: [LAD] simulating analog audio devices part II, Paul Winkler, (Wed Jun 6, 7:43 pm)