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| Project Gallery: A75 |
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I started this A75 project about 3 years ago. I aquired the sinks and cards first, and
planned on buying the output devices and transformer later. About the time I got the cards loaded
along came the SOZ and there went my heatsinks. So I've been enjoying my SOZs for quite awhile and
then the bug hit again. The money was there so bye bye SOZs. The chassis construction is based around
the heatsinks, which is pleasing to me. I just have to find big enough sinks for my layouts. The
output driver cards were drawn and etched by me. The transformer is from Plitron and I used IRFP
240/9240 devices. The sinks were purchased as a 6' extrusion and cut and milled to size. Aluminumn is
easy to snap a tap off in, but I found that cleaning the tap 2 or 3 times for each hole and some wd40
works pretty good. Start up threw me a couple of curves but Nelson and the gang at DIY Audio were
there to help me through it. This is a great amplifier and I'm glad I finally built it. And yes,
amplifiers that will drive down to .1 ohm are really cool. The preamp in the picture is my BOSOZ.
Thanks to everyone at Pass Labs.
Scott Granger
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