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Here's my power amplifier. It's a Symasym 5.3 like here http://www.lf-pro.net/mbittner/Sym5_Webpage/symasym5_3.html but it's modified to use Toshiba 2SC5200 and 2SA1943 output transistors. The small transistors are matched MPSA92, MPSA42 and BC546. Capacitors are Rubycon ZL, Panasonic FC, Wima and Silver Mica. The input cap used to be a Jantzen MKP 8.6uF. But I managed to find Unitra Telpod 8uF oil caps so I'm using them instead. You can see that the old cap (big black cylinder) is bypased, and the new one (huge silver cylinder) is in it's place. It sounds better than any other amp I've heard. Here's one of the channels running  It doesn't look very good, but it's been through a lot. It was on fire a few times, and this board was used for testing so many components have been replaced.  This is the other channel    The board was made using old electronics magazines and a clothes iron. 
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Jan 8, 2008 12:35
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| # ¿ May 3, 2024 01:44 |
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I'm studying mechanical engineering, but we had some EE lessons. I learned most of the stuff myself. Most of my resources are not in english though. This is a pretty good forum in english http://www.diyaudio.com/forums/showthread.php?s=&threadid=60918&perpage=10&pagenumber=1+ this is a very long thread about this amplifier. It's kinda hard to read. Lots of offtopics and no content posts, but there is interesting information there. http://www.sound.westhost.com/ is a really good website with lots of articles and projects. Project 3A from that website was my first amplifier. The book "Art of electronics" by Horowitz and Hill is also very good. The 2 best forums about electronics and audio I know are in polish. But this thread has some nice pictures of amps http://www.audiostereo.pl/forum_wpisy.html?temat=24587&all=1
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Jan 9, 2008 02:19
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This is not a completed project yet, but I'd like to show some pics. It's a vacuum tube headphone amplifier that's going to be used as a preamplifier too. The schematic I used is http://student.agh.edu.pl/~lnowak/fotki/sch.jpg The tubes I used are RFT ECC82 and russian military 6N1P-EW (6Н1П-ЕВ) I don't have any photos of the insides yet. This is the 6N1P and one of the sockets I'm going to use:  The cover with sockets in place  The front panel and the sides   I'll try to post some more pictures when I finish.
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Feb 14, 2008 23:46
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Here's my subwoofer.  I'm still bulding the rear panel for it but I already tested it with a software crossover and an external amp and it's really good for its price.
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May 3, 2008 21:36
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