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Old 19th August 2007, 03:30 AM   #11
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It's VERY rare that an FET is damaged when replacing them. Can you describe the procedure you use?
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Old 19th August 2007, 03:36 AM   #12
ppia600 is offline ppia600  United States
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Well I'm talking about the rails some of the amps use where the transistors are all soldered to the metal rail and then the rail is screwed onto the amp with a little grease between, almost like fosgate wants all of the power transistors to be replaced as a matched set. If they are going to still use grease, they could save the piece of metal and just bolt them individually to the sink with the nonconductive coating they used in the old models. I noticed it in the class D amps and some others around two or three years ago. I haven't touched one since then. Every time someone asks me to look at one, I refuse. I kind of like the original punch amps before the hd series, but so many of the parts are hard to get ahold of.
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Old 19th August 2007, 04:23 AM   #13
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The new amps use the MEHSA insulators. The old amps used a strip of anodized aluminum. The really old amps used a hard anodized finish. The MEHSA system is probably more efficient than the anodized strips. I don't know why they quit using the hard anodized sinks. They started using the anodized strips before they went to cast sinks.

What parts are you having trouble finding for the old (non-HD) amps?
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