hi Giuseppe<br><br>would it be at all possible to provide a link to the ltspice file you made of the amp? i am having trouble finding out how to do things like output transformers well, and didn&#39;t even imagine the possibility of spice simulating a particular speaker. whilst i am eagerly watching the ngspice patchset i would like to play around with one that i know works so that i can make sure i&#39;m doing things right.
<br><br>ps. where abouts did you get the models for the transformers, valves and speaker from? and how did you simulate the reverb section?<br><br>cheers<br>porl<br><br><div><span class="gmail_quote">On 08/06/07, <b class="gmail_sendername">
Giuseppe Zompatori</b> &lt;<a href="mailto:siliconjoe@gmail.com">siliconjoe@gmail.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br><br>Some time ago I did a sim using LTSpice<br>(<a href="http://www.linear.com/designtools/software/">http://www.linear.com/designtools/software/</a>) under Wine of a Carvin<br>Legacy tube amp. LTSpice was the only program that had wav in/out and
<br>would run on Linux at the time I tried this.<br>The schematic for the amp is here<br>(<a href="http://carvinmuseum.com/pdf/amps/VL100%20&amp;%20VL212%20Legacy%20Amp.pdf">http://carvinmuseum.com/pdf/amps/VL100%20&amp;%20VL212%20Legacy%20Amp.pdf
</a>).<br>It&#39;s a complex beast that ngspice would have lots of troubles<br>simulating because of the infamous &quot;floating nodes&quot; and other quirks.<br>Everything is included into the sim, preamp, phase splitter, output
<br>valves , output transformer and even the model of a greenback speaker.<br>Naively, I haven&#39;t set the sim time step to the a sampling freq<br>related number, nevertheless it sounds Ok to me, I dont know how<br>LTSpice deals with transient sims involving wav files in details.
<br><br>The ogg for the sim is here:<br><br><a href="http://siliconjoe.googlepages.com/legacy-swcadiii-1-cab-reverb-delay.ogg">http://siliconjoe.googlepages.com/legacy-swcadiii-1-cab-reverb-delay.ogg</a><br><br>I played a bounch of fast licks to have the transient sim finish
<br>before the universe will collapse, yeah you guessed it it&#39;s pretty<br>slow... I think it took 1 day to finish on an AthlonXP 2800+...<br>Now days I am messing around with GNUCap and QUCS (<a href="http://qucs.sf.net">
http://qucs.sf.net</a>)<br>to which I just ported my first tube model whose plate voltage/grid<br>current curves look like that:<br><br><a href="http://siliconjoe.googlepages.com/Schermata.png">http://siliconjoe.googlepages.com/Schermata.png
</a><br><br>Hopefully a way to inject wav files in both GNUCap and QUCS will come<br>true as they both seem better than spice derived programs.<br><br>Cheers,<br><br>-Giuseppe<br>_______________________________________________
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</a><br></blockquote></div><br>