I bought a SE-40 second hand about 3-4 years ago and have not had any reliability problems with it, but I have heard that some people did have problems with GTA products. For a long time it was difficult to get a schematic for the SE-40, but I've seen schematics being sold on Ebay. The only time I've had a problem with the SE-40 is when I biased it. The first time I tried a blew a tube, but that was my fault not the amps. Biasing these amps can be a little tricky. With all that said, they really are great sounding amps. I was using mine with a passive pre and a pair of Triangle Titus speakers. Within it's limitations it was an excellent sounding, fairly inexpensive system.
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