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Old 19th May 2007, 05:26 PM   #1
steevo is offline steevo  United Kingdom
diyAudio Member
Join Date: Sep 2005
Default Quad 306 fault

I have a quad 306 and applied an input signal to high, this has damged the amplifier and rpdoced a stragne fault that i cant trace, the ouput now oscilates as per the pictures. I have replaced all of the semicondutcors and capacitors and tested the amplifier at various stages as components were replaced. The only thing I havent replaced are the 3 inductors, and resistors now.

The dc voltages are more or less in line with those of the working channel and I am not sure were to go next. If I diconect the feedback network might this help identify the problem. Or will it destroy the amp if I try and power it up without the global feedback. The scope plot timebase is 2 ms per division, and .5 volts/div vertically

Any sugestions

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Old 19th May 2007, 05:27 PM   #2
steevo is offline steevo  United Kingdom
diyAudio Member
Join Date: Sep 2005
Default Scope plot

I made a mistake the scope plot is 1 ms/div
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