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Old 26th August 2010, 03:42 PM   #1
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Default Noise from new caps in signal path, please help!

Today i got the caps for my whole amp (recapping the whole Pioneer SA-7300).

I started with the two power caps 10,000uF, and everything went smooth, and sound check is great.

After the power caps i moved on to four caps in the signal path
(all are(were) 2.2uF 25v Tantalum cap).

I replaced these four with Mundorf MKP Metal Polypropylene (They
are ofcourse Non Polarized).

Did the sound check and now i get an irritating uneven buzz and hiss
and some weird changing noises.

I tested a few songs anyway and when the volume is up i can't hear
the noise much and there is a great improvement in sound exce[t for the
noise.

I noticed that if i put my finger close to one of the four caps, it increases
one of the noises being created from the new caps. Does that mean
anything? or it's just a static thing?

Please help!
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Old 26th August 2010, 04:17 PM   #2
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me would limit capacitor upgrade to replacements that fit into the pcb. Otherwise you may get an unwanted antenna.
regards
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Old 26th August 2010, 04:26 PM   #3
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Antenna? isn't there a way to work through that anyway?

So i guess i have to put in those tantalums again...damn...
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Old 26th August 2010, 04:44 PM   #4
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if you can exclude bad solder joints and accidentally miswiring, there is not much room for speculation.
regards
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Old 26th August 2010, 06:01 PM   #5
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Problem solved, stupid me, the second sound test was with the laptop's
power adapter and not running on batteries and thats what creates the
interference.
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Old 26th August 2010, 06:04 PM   #6
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so the 'old' amp had this problem with your laptop too?
regards
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Old 26th August 2010, 10:17 PM   #7
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Yes, i usually connect it without the power adapter when playing music.
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Old 27th August 2010, 02:13 PM   #8
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ok
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