Philips (Black Tulip) N5748 HIFI Cassette Deck

De compact cassette was een schitterende uitvinding van Philips en werd een wereldwijd succes. Ook bandrecorders blijken een tijdloos populair medium.Kun jij ook geen genoeg krijgen van die sfeervol draaiende spoelen? Deel hier je magnetische passie!

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Michael 5of9
Berichten: 43
Lid geworden op: 06 sep 2014, 11:48
Locatie: CUMBRIA in ENGLAND
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15 mei 2019, 16:03

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:
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Volume Control.jpg
Balance Control.jpg
Kind Regards Michael
Heating & Electrical Engineer
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Fotohuis
Berichten: 6483
Lid geworden op: 19 feb 2016, 17:37
Locatie: R'stein soms Mykolaiv
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15 mei 2019, 18:00

Ultrasonic cleaning in IPA drying and using contact grease or Brunox will be the final solution for this potentiometer problem.
http://www.svema.info
Dynavox TPR-3 6N3P-EV voorversterker, ET-100+Teufel U.20, Theater 500. N4504, N4511, N4450, N2521, N2507, (1)408, 212, 312, 222, draaitafels +GP401/412 Mk2 Sh./MC-3. CD204, CDF200. NAD C352, C422, C521BEE+FB820. 22RH743+22RH544/79R
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Michael 5of9
Berichten: 43
Lid geworden op: 06 sep 2014, 11:48
Locatie: CUMBRIA in ENGLAND
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31 mei 2019, 13:31

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/
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Volume Control R s size.jpg
Looking cleaner
Volume Control L s size.jpg
Looking cleaner
Kind Regards Michael
Heating & Electrical Engineer
Gebruikersavatar
Fotohuis
Berichten: 6483
Lid geworden op: 19 feb 2016, 17:37
Locatie: R'stein soms Mykolaiv
Contacteer:

31 mei 2019, 13:45

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.
http://www.svema.info
Dynavox TPR-3 6N3P-EV voorversterker, ET-100+Teufel U.20, Theater 500. N4504, N4511, N4450, N2521, N2507, (1)408, 212, 312, 222, draaitafels +GP401/412 Mk2 Sh./MC-3. CD204, CDF200. NAD C352, C422, C521BEE+FB820. 22RH743+22RH544/79R
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