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Old 18th November 2012, 09:29 PM   #131
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Nobody? :-(
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Old 18th November 2012, 09:46 PM   #132
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make this and try , connecting it at amp output - maybe you're having oscillation on output

if LED's are lit , it's there
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File Type: gif oscillation detector.GIF (2.5 KB, 245 views)
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Old 18th November 2012, 09:51 PM   #133
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Thanks! I have an usb oscope, can I check oscillations with it?
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Old 18th November 2012, 09:52 PM   #134
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is it able to cover at least up to 10MHz ?
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Old 18th November 2012, 09:55 PM   #135
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Good enough? http://www.easysync-ltd.com/product/520/ds1m12.html
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Old 18th November 2012, 10:00 PM   #136
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nope if "Analog Bandwidth 250KHz" is what I'm understanding

make that two led thingie

put 1uF solid cap in parallel to C19 (Service Manual nomenclature)
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Old 18th November 2012, 10:03 PM   #137
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Ok, and btw, I have C20=12pf not 10pf. Is it bad?
How critical capacitors and resistor values in that 2LED thing? I do not have exact values?
1nf before I connect a thing or instead connecting it?
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Old 18th November 2012, 10:07 PM   #138
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I said - service manual nomenclature

it's 220uF , cap for Aleph CCS modulatioon
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Old 18th November 2012, 10:10 PM   #139
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Ops, sorry, yep. I already have 10nf there, ok?
Another thing: I thing I have some hum in idle out of the speakers. I am not sure if it is 60hz(120) from PSU or not. I do not have ground loops though.
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Old 18th November 2012, 10:36 PM   #140
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too many things in same time

I couldn't cope with your mix up between one schmtc nomenclature and different pcbs and confusion in your head ;

whatever - what you can do is to make proper original front end ( not with those ZVP or something like that ) then start from there

every change will be change from original and you'll know is it for better or for worse
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