Hello thank you for a very informative video on cleaning variable capacitors/pontentiometers

Hi, Roger! We missed you! I still have my mini oscilloscope with your mods! Also the little function generator. Both complete in their clear acrylic cases. I actually got my mods to fit in the cases. Thanks for those videos and this one!

@user-xq2zn8bu9q

6 ай бұрын

What mini oscilloscope is this...? Are they any good & is it worth buying one...?

Thank you and appreciate your effort. Greetings to you from Turkey .

Really great info. Thanks!

Thank you for this video!

Brilliant. Thank you.

Thank you very helpful!

VERY GOOD INFO

I use Kontakt PR, but may get interested in Tuner 600. I'd like to test Argentum fluid for silver-plated components (switches etc.) if I get a chance.

The basic question about any spray or fluid is whether it takes any contaminants with it when it vaporizes. Mostly not. Just think why distillation works for separating for example alcohol and water. In the cleaning attempt, the original dirt rarely evaporates along with the solvent. Your test with the paper also shows, even without original dirt spot, how something was left as a ring. I would really favor washing - ultrasonic or whatever - than depend on vaporizing. If I have to depend on the spray cleaners, I would apply so much, that the cleaner and dirt can be shaken away together, rather than hope that the dirt miraculously evaporates as well.

@KainkaLabs

3 ай бұрын

The spray and fluids shall wash away the contaminats, not "evaporate them", which is of course nonsense. Ultrasonic cleaning has it´s own dangers. It can destroy parts by vibration. And you have to desolder the part first of all and then take it out to get it into the US-cleaner. And you have to have at least a semiprofessional US-cleaner. So strays and fluids are in most cases the thing to go with first.

Sometimes you get AM. FM. transistor radios that have the plastic shell make a lot of scratchy noise while tuning. One video made a note of interest to me, was that the noise was caused from the tuner shaft and its contact. I always thought it was the insulation between the plates. So rather than drench the entire tuner with contact cleaner, just use the cleaner with an eye dropper on the shaft.

I use lighter Fluid and a small paintbrush for Potentiometers in my tube radios,i never hat Problems in the past 10 years.

@KainkaLabs

6 ай бұрын

Can you specify what "lighter fluid" is?

@user-tu9lm3lp2n

6 ай бұрын

That zippo lighter Fluid,or if i don,t have some,i use white gas, i always have some white gas,because i use it for my coleman lantern .but be careful,if you use zippo lighter Fluid for cleaning, in some cases, test it ,on old defective Potentiometers,before using it on good ones,like i do.

If I have it out I find using the drill press and a 1/8 drill bit so I can spray it. Then cover the hole with small piece of metal furnace tape.

Many many thanks! I wonder why acetone wouldn't be a good cleaner for the worn potentiometer in the D-Jetronic throttle "switch". Yes, I did think of bending the arm a llttle. Regards from South Australia

@KainkaLabs

Жыл бұрын

Acetone is too agressive. It dissolves nearly everything made out of plastic, oil, grease etc.

Air variables can be boiled in water to clean them without damage. soaking in diesel fuel or kerosenee also works well for loosensing grease and grime.

@KainkaLabs

2 жыл бұрын

Thanks for the hint. Turpentine or paint-thinner will probably also work.

Great tip - testing the cleaning fluid on paper before using it! What kind of a spatula set is the one being used here? Where can one find it?

@KainkaLabs

Жыл бұрын

You find the spatula- or spudger-set in our online-shop in this section: www.ak-modul-bus.de/stat/laborzubehoer.html It is also described in the video-series "Every maker should have..." in my KZread channel.

@Stelios.Posantzis

Жыл бұрын

@@KainkaLabs Awesome! Great tool site - thank you!

Thank you very much for this video! I am from India, a Bio-Medical Engineer by profession & a radio & vintage audio & tape recorder hobbyist. I want to know the reconditioning process for the compact film type ganged capacitors. Please let me know through your video in case you have done any work particularly on these components. Regards!

@KainkaLabs

2 ай бұрын

What do you mean by "ganged capacitors". Like the metal one which is shown in the video? Use compressed air for the metal plates. If the axle is stuck, soak it in acetone or another organic solvent and relubricate it with modern "non-ageing" grease.

I thought they were variable resistors?

I have to replace a small 50k metal trimmer on a 1973 receiver, these 4 trimmers only have two legs and I don't see anything like them on the whole internet..all it says on them is 50K..what to do?

@KainkaLabs

Жыл бұрын

Use a "normal" 50k trimmer and only cut off one of the outer legs. So you have the wiper-leg and the other remaining leg.

@Limousine08

Жыл бұрын

@@KainkaLabs I sort of ended up doing that, I got some small blue bourns ones and soldered the wiper leg to one of the others, seems to work

@Limousine08

Жыл бұрын

@@KainkaLabs so strange tho I couldn't find even a picture of one of these things anywhere

Wir haben in unserer Radio&Fernseh Rep Werkstatt fuer Kontakte und Potis immer Feuerzeug Benzin benutzt (1974), mein Meister wollte von Kontakt Sprays nichts wissen.

@ikarus30449

9 ай бұрын

keine gute Idee

Can you still buy replacement potentiometers?

@KainkaLabs

6 ай бұрын

No, because potentiometers were made specific to every device and usually were not standard parts.

Those Spooky , large , "OUT of The Earth"- ... , Cosmic, ... , ... variable Capacitors ,... ... ... m ... aren't' they Magical ... ??? 😃😃😃😃😃😃 Time TRAVEL, ... .... 50 years .... back in time .

Why not bend the 4 tabs and remove the cover completely and then clean it?

@KainkaLabs

Жыл бұрын

Yes, you can do that, but in my experience you never get it reassembled just as tight as in the original state. So only if the cleaning/lubricant spray does not work, I would disassemle the potentiometer to get to the carbon resistance layer.

Thank you for the great video! I posted a comment about 4 weeks ago however I believe it is pending your approval? Would you be able to please approve it so it can be made visible to all. Thank you

Have you tried W40 spray for repairing carbon layer in potentiometers?

@KainkaLabs

2 жыл бұрын

No, better not. Use only the chemicals I recommend in the videos or name one that you have good long-time experience with.

If the carbon is worn away on a potentiometer, I would just replace it if possible.

@KainkaLabs

3 ай бұрын

You will only in very rare circumstances find a replacement potentiometer that fits mechanically, has the same value and charateristic and the same quality. Look e..e. at the potentiometer at the bottom right. Where do want to search for this one and what are the chances you find the exact type?

dont ever use a ultrasonic cleaner,it will literally destroy the plastic variable capacitor

@KainkaLabs

Жыл бұрын

Have you tried?

@thebraziliangardener8481

Жыл бұрын

@@KainkaLabs i tried it on a modern one,it pits the copper and alluminium sheets aswell

Very interesting video. Thanks for uploading it. Do you think that cleaning the pot with some 99% IPA and lubricating it with white lithium grease would work? Or would it mess with the resistance?

@KainkaLabs

Жыл бұрын

I don´t know if lithium grease is conductive?