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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Need Advice on Repair of Peavey Standard 130 Watt Power Amplifier
Hello,
I am attempting to repair a Peavey Standard 130 watt power module and would appreciate some advice. I am not experienced in amplifier or electronics repair but I have taken all the electronics courses that the local Jr College (Mesa Jr. College, San Diego) had to offer. I have a lot of theory but not any practical experience. The amplifier will pass a music signal to the speaker when I patch an audio signal directly into it, but the music is cracked and fuzzy, very distorted. Here we have bypassed the pre-amp front end completely. This unit is in a Standard Power Pak, which is a guitar setup. I have the schematics and have been poking around with a computer sound card oscilloscope (Daqarta). I have also constructed a simple tone generator so that I can use a stable signal to trace. What problems might allow a simple amplifier like this to still work even though it is distorting the signal? I have checked the main power transistors in circuit using a diode checker on my Beckman DMM. I recently successfully repaired a Peavey XR600E using this same diode checker to identify the 3 blown transistors in the left side. I also had the right channel to compare readings to, so that was a great help. Any help you can provide would be greatly appreciated. Thank you. d0ct0r RaTsTaR |
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