Question about Amplifiers & Preamps
Hey man,... no worries.
Were any fuses blown? Check this first and foremost before you do anything else. If there were blown fuses, you then (if you are familiar with how), need to check the output stages for shorts. NOT generally to ground as you have suggested.... but more between the center and outside pins (collector emitter short we are looking for here) To check the output transistors properly, you need to unsolder leg and check each of the output transistors junctions base emitter, and base collector, and also collector emitter for any leakage. Once you find the offending channel(normally there is only one), you need to then carefully check the driver transistors also. Pay attention to low value resistors about the output stages, small signal and zener diodes and if they are there, any power diodes. If you are unsure of the condition of a part, then replace it to be sure :)
Hit me back and let me know how you go.
Posted on Apr 25, 2008
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