Re: [LAD] simulating analog audio devices part II

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
_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev@email-addr-hidden
http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev
Received on Fri Jun 8 12:15:02 2007