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Cambrigdge A500 amplifier troubleshooting
Cambrigdge A500 amplifier troubleshooting
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Old 5th August 2008, 08:30 PM   #1
omnitek is offline omnitek  Canada
diyAudio Member
Join Date: Mar 2008
Default Cambrigdge A500 amplifier troubleshooting


I need some help to troubleshoot this Cambridge A500 amplifier that had some blown output darlington SAP15P and SAP15N transistors in the left channel. I replaced them and the driver and pre-driver transistors as well. There was also one burned resistor that I replaced.

I was able to adjust the bias properly but when I put a load at the output and a sine wave at the input, I see some sort of oscillation or distortion on the negative peak when I check the output with an oscilloscope. The distortion or oscillation is there even with a low signal on 1 volts at the output. It is not present when I remove the load from the output.

I checked for other bad resistiors, diodes or capacitor but couldn't find one.

Any help would be greatly appreciated.
Thank you!

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