Magtech Amplifier

Mine are warm and I play my hybrid stats pretty loud. They (I have a pair) get much warmer than at idle, but I cannot say they are hot.

It sounds like you may have a problem with high frequency (ultrasonic) instability. This may be caused by your speaker cables. Roger has a white paper about that on his web site and says that can cause the amp to run hot. I have to of his amps and they have never even gotten warm to the touch. I would recommend calling Roger and discussing it with him.

agree on cables. those amps are oscillating if thye are hot. Check the rubber feet to make sure they ar not melting.

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.