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Old 3rd July 2012, 11:46 PM   #1
royf is offline royf  United States
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Default Transistor help for Sony STR-6120

I am not sure if this is an easy question or not, but I am looking for transistor replacements for the power amp board on a STR-6120. I tried google for cross reference guide but all I could get were NTE parts. Has anyone worked with this board before that has suggestions? I have intentions for a shotgun of this board due to serious heat damage to nearly all the resistors and caps, my guess is the transistors are dead too and if I am pulling them I might as well replace them.

2SA527
2SC631
2sc633
2SC756
CH-1256H

Any help would be great.


Roy
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Old 4th July 2012, 08:09 PM   #2
royf is offline royf  United States
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Come on, with the genius of this community surely somebody can help out a lost audio soul????
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Old 7th July 2012, 09:03 PM   #3
royf is offline royf  United States
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hello?
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Old 7th July 2012, 10:58 PM   #4
jaycee is offline jaycee  United Kingdom
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These are OLD parts.. substitutes wont be easy to come by. It's unlikely you'll get anything suitable for the power transistors for example.
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Old 7th July 2012, 11:15 PM   #5
royf is offline royf  United States
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Jaycee thanks for your help!!
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Old 7th July 2012, 11:22 PM   #6
DUG is offline DUG  Canada
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Find the data sheet or the transistor's characteristics...you have the package type

Example: in attached pdf find the 2sa527 and use digikey search feature for transistors that match

That is the best one can do with really old parts

good luck
Attached Files
File Type: pdf 2SA527.pdf (102.5 KB, 10 views)
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Old 8th July 2012, 01:14 AM   #7
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Considering the difficulty in sourcing these parts (I could only find one from my local supplier, 2SC756 and it wasn't cheap), I would suggest testing them rather than just doing a total replacement. This may reduce your problem to a more manageable level. Given the age of the unit, it is likely that the semiconductors are germanium and not readily available. How did the heat damage occur?

Last edited by Bibliophile; 8th July 2012 at 01:32 AM. Reason: Additional information
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Old 8th July 2012, 01:45 AM   #8
royf is offline royf  United States
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I am not sure how the damage occurred, I inherited it this way. But everthing on this amp board's right side is pretty well cooked.
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Old 8th July 2012, 01:49 AM   #9
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Can you post some pictures of the damaged area and surroundings ?

Last edited by Bibliophile; 8th July 2012 at 01:52 AM.
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