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Philips MFB speakers
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Fatmangolf View Drop Down
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Joined: 23 Dec 2009
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Points: 9695 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jan 2026 at 9:03pm
I think the auto button is light grey. If the fault only happens when it is in I would focus on the sample and hold circuit that switches the relay and speaker on when a music signal comes in. That circuit is bypassed when the switch is out, pointing to a power supply issue.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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AllanT View Drop Down
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Points: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AllanT Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 2026 at 10:08pm
Is the grey button the switch, the led used to glow, then when triggered, went bright, now it's not on at all, so I will try to trace the circuit and check for dry joints, hopefully this may be the crackling problem too. Thank you for the advice. 
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Fatmangolf View Drop Down
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Points: 9695 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jan 2026 at 8:01pm
Yes, the push button switch enables the auto on/off circuit. The solder joints in that area are a good starting point.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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