Question about Electro-Harmonix 44 Magnum 44W Guitar Power Amplifier

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I have a 1995 Fender Hot Rod Deluxe, I giged out and when the amp was on for a while it would shut down i would wait and in a few min i could turn it back on. I loooked around and discovered i had the Speaker connection plugged into the EXT speaker cab with no connection to the main speaker out. could this have been causing some kind of internal shutdown of the Amp?

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This PROBABLY was not the problem. When you plug into the EXT speaker jack, you connect to a 4 ohm tap on the output transformer instead of an 8 ohm out as it anticipates you have an 8 ohm plugged into the main and you are plugging in an additonal 8 ohm speaker to bing the load down to the 4 ohm tap. You will have less output plugged into the EXT jack and MAYBE you tried to get out the same volume level in which case you may have been overdriving which is very hard on the output tubes... possibly you colored the plates in them and the unit shut down for that reason.
There really isn't any thermal shutdown sensor BUT if the amp still has the problem when configured correctely, suspect the NTC (negative temp coef) device that limits the inrush current. These heat up and lower their resistance as power is turned on to reduce the surge when turning unit on. These have a habit of degrading, cracking, and failing. The device is should be near the fuse holder as it is in series with a wire from there to the power transformer. It will be about the size of a quarter and three times as thick as the same. It will have two leads coming out the edge and likely will be black in color.

Posted on Jan 04, 2011

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