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Re: Philips (Black Tulip) N5748 HIFI Cassette Deck

Geplaatst: 15 mei 2019, 16:03
door Michael 5of9
There is a little Interference Noise from the volume control on this unit; only when it is being turned around, and in a certain position this happens, I have tried once giving it a good spray of Kontakt Chemie: Kontakt 60 and a few days later a good spray of Kontakt WL and turning the knob after each spray to move the spray around inside.
https://drive.google.com/file/d/1BjdC99 ... sp=sharing

I have uploaded a two old photos showing the rear of this control although one of them is the balance control; there is access for spraying on the side and maybe from the centre of the end and info on Kontakt Chemie.

Can you kindly advice on this; I don’t want to do anything more without further sound advice because it could also destroy the potentiometer depending on the materials in the potentiometer :think:

Re: Philips (Black Tulip) N5748 HIFI Cassette Deck

Geplaatst: 15 mei 2019, 18:00
door Fotohuis
Ultrasonic cleaning in IPA drying and using contact grease or Brunox will be the final solution for this potentiometer problem.

Re: Philips (Black Tulip) N5748 HIFI Cassette Deck

Geplaatst: 31 mei 2019, 13:31
door Michael 5of9
There will be carbon tracks inside this control; so an IPA is not recommended for this at all, it would washout any lubrication that is already there, the IPA will only destroy the carbon.
The KONTAKT 61 is a cleaner with a lubricant; which I already have, I have tried injecting a small spray amount through the side access entry as well as from the end of this control then turn the knob fully both ways for several times to move the spray around inside, then apply a little push pressure on the knob whilst turning followed be a little pull pressure.

I fitted a piece of paper towel around the control to catch any over-spray and used an absorbent clean cloth to remove excess spray from the external parts; I left it for an hour before switching on the unit to test.

Doing this hasn’t made any difference at all, apart from, when I turn the volume knob it feels more firm, less looseness, so on that side there is an improvement.

Please can you give further suggestions, thank you.

https://music-electronics-forum.com/sho ... hp?t=27696

https://forums.tomsguide.com/threads/cl ... fo.232603/

https://audiokarma.org/forums/index.php ... rol.13152/

Re: Philips (Black Tulip) N5748 HIFI Cassette Deck

Geplaatst: 31 mei 2019, 13:45
door Fotohuis
FullSizeRender.jpg

IPA (Iso Propyl Alcohol) won't destruct carbon at all. It is a neutral de-greaser and used in all semi-conductor industry.

After it you have to dry and use or (RS-) Contact Grease or e.g. Brunox Turbo spray as lubricant.