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Re: Philips center-tap Potentiometer

Geschreven door Pieter de Kock op 26. Jun 2003 08:05:24:

In reactie op: Philips center-tap Potentiometer geschreven door Ahmed Abasiry op 26. Jun 2003 07:40:35:


>I live in Canada and Eurpoean radios here are not very popular and almost impossible to find parts for them. I am proud of this radio since it is very rare here and would like to get it to work again and I would appreciate any help or advice to get these pots.
>Thanks and Best Regards,
>Ahmed Abasiry
>Alberta-CANADA
>email: aabasiry@hotmail.com


Philips collectors should have a variety of these on the shelf. However, in most cases such a a replacement is not good enough to be used just like so anyway. So I would recommend that you try to repair the potentiometer first. Carefully file away the aluminum where it is folded around the back of the unit. Do not try to bend it up, it makes a mess. Then, the back (resinated paper containing the resistance strip) can be lifted off. Be careful of the carbon wiper button, it is often loose and can get lost easily. Clean the carbon track with alcohol and inspect. Use conductive silver paint or epoxy to secure the electrical contacts where they join the carbon track, these contact joints often fail. Then bend the wiper spring up for renewed proper pressure against the track (not too much), lubricate the track with silicone grease and reassemble. Usually the back of the potentiometer sits snugly enough so that no glue is required, and the pot can then be easily opened again for subsequent servicing.
I usually do this and the last one 2 days ago was a complete success as were all the others previously. Good luck.





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