diyAudio Forums Archive > Top > Amplifiers > Tubes CAD Program for Tubes - Click HERE for Original Thread Family_Dog Hi All- I was wondering if anyone knows of a CAD program which is tube compatible, and either free, or at low-cost. I am not at all artistic, my hand-drawn straight lines are skew, my resistors look like a drunken worm, my caps are reasonable, and coils & transformers are well-nigh impossible for me to draw freehand. -Eric 316a Hello , Tubepad is free and works by using symbold exported into Paint . Do a search on Google , you'll soon find it cheers :) 316a Family_Dog Hi 316a, Got it, thanks! Fascinating little program :) -Eric Geek If you want real-time Spice simulation for tube projects, check out: http://www.microcode.com/downloads/student.htm There are tons of custom made spice models for other tubes available from the web, like from here: http://home.netcom.com/~wb2jia/tubes/spice.txt and http://www.duncanamps.com/spicevalves.html I have a few too that I should post some day ;) Family_Dog Hi Gregg, Many thanks! The Student Version works like a charm for me :) -Eric Nisbeth The PCB cad package Eagle (from www.cadsoft.de) has a free library of tube symbols available for download on their website. :) /U. Family_Dog Hi Nisbeth, I gather I would just download what I require from their Libraries in the Downloads section and copy it over to the "Models"Folder. Thanks, am doing so now. -Eric

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