Unfortunately, I can't offer much help. But, I was in a similar position, with a Linn Intek. A couple of ideas come to my mind. First of all, your repair person might be able to work with a Linn Intek schematic--the Intek's power amp section was very similar to, if not exactly the same as, the Powertek. Of course, an Intek schematic might not be easy to come by, either.
You might also check with Linn dealers that repair equipment themselves. They might be able to help you find a schematic, or they might offer repairs that are cheaper than Linn's.
Finally, some people would tell you to simply toss the amp. I am not sure that I'd go that far, but it's worth considering. I essentially replaced my Intek with another amp--the $250 does seem high, and my talk with someone at Linn (the US agent) left me less than satisfied. However, I did keep my Intek, and if I can I may repair it someday for a second system.
In case you're having the same problem that I did--sudden protection circuit shut downs for no reason--something that I've discovered is that warming the amp up for a while can help.
Good luck!
You might also check with Linn dealers that repair equipment themselves. They might be able to help you find a schematic, or they might offer repairs that are cheaper than Linn's.
Finally, some people would tell you to simply toss the amp. I am not sure that I'd go that far, but it's worth considering. I essentially replaced my Intek with another amp--the $250 does seem high, and my talk with someone at Linn (the US agent) left me less than satisfied. However, I did keep my Intek, and if I can I may repair it someday for a second system.
In case you're having the same problem that I did--sudden protection circuit shut downs for no reason--something that I've discovered is that warming the amp up for a while can help.
Good luck!