Sony TA-8650 Pre-amplifier fault - diyAudio
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Old 17th February 2009, 09:26 AM   #1
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Location: Cornwall
Default Sony TA-8650 Pre-amplifier fault


I have a fault in the pre-amplifier section on my amplifier, it is one of the IC,s it is a BX269A (a sony special jobby)

Does anyone have one they would be willing to sell me, or has anyone a knackered 8650 they would be willing to sell me parts from

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Old 17th February 2009, 02:12 PM   #2
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is that one of the green thingies? can it be replaced with a adapted board with conventional ics if you have the cct it would help
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Old 17th February 2009, 02:19 PM   #3
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Default TA 8650 fault

Hello yes it is one of those green rectangular thingys on one channel, i did think about that but i have not a circuit diagram for the chip, it is a 14 dil ic with 8 transistors plus a few resistors encased in that hard resin

I have a service manual for the amp but no info on the chip

I did manage to scrape enough resin off to check the transistors and they are working.

I also swapped the chip with one in the phono stage (same chip) and it worked so that proves it is the ic

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