Magtech Amplifier

If a Thermal Trak transistor fails it will cause the amplifier to run very hot on that channel even on idle. The entire top of the amplifier will be hot but if a measurement is taken one side will be hotter than the other unless there has been a failure on that channel too.

I am not sure if there is a situation where a Thermal Trak transistor not working properly but not completely failed will only show up when the load is demanding. If anyone has a problem with a Magtech amplifier they should call or email Roger Sanders. He is very responsive.

It is especially helpful if you can report actual temperatures instead of relative terms (e.g. hot). A multi-meter with a temperature probe is one useful option to measure temperature.

Most of the Coda Amp's are also using the Thermal Trak technology developed originally by ON SEMICONDUCTOR Company years ago. David Hafler back in the early 90's utilized the Thermal Trak technology with poor results due to voltage problems with his amps. Many of the Hafler amps at that time blew up and Hafler had a lot of refurbs for sale, but the problem became so severe that it caused Hafler to go out of business. David did much better with his Dynaco kits back in the early 60's. Doug at Coda several years ago informed me that yes indeed all the Sander's amps are manufactured by Coda in final completed section's and the final assembly into completed unit's is done by Sanders Sound Systems.

Well, the amp died last week. One of the 15 amp fuses broke:glass shattered, but the metal remained in tack. The speaker fuse blew, and no damage done.
As to the possibility of cables occulting, as I am using Sanders speakers cable, I'm pretty sure I am ok on that matter.
Will be sending it back today for repairs, and perhaps Roger will find something that will explain the heat when he does repairs.
Given all the comments I've seen on the web about how these run cool, I'm curious if I just got one with an issue that slipped by and showed itself when connected in a system.
This is the second trip back...first one died due to a bad board design that was changed shortly after mine was purchased, and Roger simply replace the amp.
Excellent guy to deal with, and I'd recommend his products no question asked. Crap happens!!

Knowing Roger, he will end you either send you a new one or a
rebuilt one with a big red bow on it. What I want for
Christmas - for the world to do business like Roger Sanders
does.

Couldn't agree more. All people in his business, or any other for that matter, could lean a lot from his business practices. A rare one!