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Old 4th February 2011, 03:04 AM   #1
Kotton is offline Kotton  United States
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Default Op amp replacements.

What to replace to eliminate this amp hiss.
I have no idea what I'm doing or what I need to replace to eliminate the amp hiss on my sony str-de135, the hiss gets louder as the volume is turned up even with no signal, I read that it should be the op amps I have identified these chips but am not sure which to replace to eliminate the hiss or what to replace them with.

5218A

2103D

LC78212

I don't know what chip does what, though I do know how to solder, any help?
I need a chip that will at least replicate these when they were new without the hiss.
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Old 4th February 2011, 05:14 AM   #2
benb is offline benb  United States
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Have a link to a schematic? It would help a lot, we could see where these are in the signal path, and what else is there.
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Old 4th February 2011, 06:32 AM   #3
Mooly is offline Mooly  United Kingdom
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More info needed...

Does it hiss on all inputs ? I suspect that any hiss is going to be "normal" for this type of product as there is so much signal processing going on.

Full free manual,
Sony STR-DE135 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

I see the SNR is quoted as only 78db... not much better than a cassette deck with Dolby C.
By all means play with the opamps but it's not going to make it quieter.
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Old 4th February 2011, 11:58 PM   #4
Kotton is offline Kotton  United States
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Didn't notice that before, xD Kind of disappointing) oh well Guess I'll use my t- amp to drive them and no more rear channel.
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