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TonyDuell · 13th Aug 2017, 6:13 pm

The A-B switch is on the amplifier motherboard. In fact the only one of these slide switches that is is the speed selector.

I've had problems with tracks lifting on the flip-flop boards in this machine and the N4510 when I replaced all the AC128s. I now take things very carefully and am prepared to add bodge-wires... That is more of a problem with the switches which rely on the soldered joints to the tracks as a mechanical fixing.

To clean the switches I removed the slider and wiped it on both sides wth propan-2-ol. Then sprayed that into the housing, put the slider in and worked it backwards and forwards. Took the slider out and cleaned it again. Then put it all back together. I don't know if it will last, but it has cured some problems.

I dont think I have the dampers for the tape guides either.

As regards the rectifier, is there any good reason not to fit a higher-current one if it fails? I can't see it would be a problem.

13th Aug 2017, 6:13 pm	#49
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,215	Re: Philips N4450 The A-B switch is on the amplifier motherboard. In fact the only one of these slide switches that is is the speed selector. I've had problems with tracks lifting on the flip-flop boards in this machine and the N4510 when I replaced all the AC128s. I now take things very carefully and am prepared to add bodge-wires... That is more of a problem with the switches which rely on the soldered joints to the tracks as a mechanical fixing. To clean the switches I removed the slider and wiped it on both sides wth propan-2-ol. Then sprayed that into the housing, put the slider in and worked it backwards and forwards. Took the slider out and cleaned it again. Then put it all back together. I don't know if it will last, but it has cured some problems. I dont think I have the dampers for the tape guides either. As regards the rectifier, is there any good reason not to fit a higher-current one if it fails? I can't see it would be a problem.