GK MB2-500 Repair: Preliminary Q's - diyAudio
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Old 19th July 2011, 12:04 AM   #1
diyAudio Member
Join Date: Apr 2011
Default GK MB2-500 Repair: Preliminary Q's

Good morning,

I am about to replace the icepower 125 power amp module in my Gallien Krueger MB2-500 because it has been stuck in safety mode for ~6 months now! It has been this long for me to source a cheap enough replacement 125. Now, I checked the jumper from the AUX power-in on the icepower and traced it back to the GK preamp where it connects to. The transistor there looks, well, interesting. A little smokey in colour and some of the writing has gone. Here are some pic's.

A shot from the back:
Click the image to open in full size.

Here's a front shot - sorry if the quality is bad - but its not much better in real life!
Click the image to open in full size.

Here's a comparison with a nearby transistor, notice it's not as dusty:
Click the image to open in full size.

So, could this transistor be dead? Is it possible to test without removing it from the board?
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