Might be a loose connection at either end of the PC and your amp has a relay in its power supply?
17 responses Add your response
I had the same thing happen a few years ago..The P/cord Manufacturer had used steel wool to clean off some burrs etc., and a small fragment of steel wool was left behind and was making contact ( internally ) and everytime I plugged the cord in it popped a fuse...As mentioned,you must have a bad connection or something broken off internally that making contact where it shouldn't be.......
I just put in a JPS Power AC+ and it seems to be overheating the amp.
Overheating where? At the IEC connection? Connect the JPS pc back to the amp turn on the amp and play some dynamic music at a moderate to loud level.
Occasionally put your fingers around the pc IEC connector and power cord near the connector. If the connector or cord feels warm to hot to the touch then that would indicate a poor connection. A poor connection under load will cause heating and the heat will transfer each way down the wire/s from the bad connection.
A bad connection could be inside the pc IEC connector. Or more likely a bad fit, poor contact surface area and or poor contact pressure, between the pc IEC female connector and amp IEC male connector. Not all IEC connectors are created equal.....
If componant parts are manufactured to a tolarance of +- 5% and speced to +-7%. The IEC male could be minus all the way to its extreme tolerance and still spec good. One cable could measure to the minus limit and the other to the plus limit. You could end up with a zero fit or a 15% loose fit and still be within limit. Not too confidence building is it ? ? ?