This is part 2 and the conclusion of the amplifier repair. Part 1 can be found here:
https://youtu.be/2z2IKguTxJIIn part 2, I discuss the design constraints to implement an alternative solution that doesn't rely on finding working clones of the long obsolete Sanyo STK465 Hybrid IC. In the end I designed a replacement PCB for my solution. This design is available in PCBWay's Shared Project library here:
https://www.pcbway.com/project/shareproject/Replacement_for_STK465_audio_amplifier_hybrid_IC_1a952673.htmlNote that for the month of September 2025 PCBWay offers free purple solder masks for free.
#Sony_TA-AX310
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#REPAIR
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0:00 A new chip?
2:53 LM1876
4:46 Options
7:41 Power supply mods
14:27 Perf board solution
16:16 Hum problem
17:37 PCB solution
20:50 Install & test
21:53 Frequency plots
23:07 Adding Bluetooth
24:58 Output power
26:02 Happy end