What kind of capacitor is this?
Good day,
I removed this capacitor from an old tube radio. Underneath the paper cover with the label is more paper; the pages are made of a tar- or wax-like material.
I came across the term "tar capacitor" online, but I couldn't figure out how this type is constructed. Does it really use tar as a dielectric?
I'd like to open it, but I'm worried there might be PCB-containing oil in it. You never know with such old things; one of the transformers in the radio says February 1948.
In case anyone can't read the label, the capacitor is from the Kondur brand, had a capacity of 1uF and a dielectric strength of 500V.
Thanks in advance 🙂
(3 votes)
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looks like a normal elko and from the time it could fit. but it doesn’t look healthy anymore
It’s all but healthy. Hard capacity and it discharges from 45V to 10V xD in under 3s
I’ll put him on ^^
The capacitor is 500V- When exchanging either take a similar value or slightly higher. It is called stress resistance. The value 1uF (if any be the same) is above it. He should have been installed somewhere in a power supply. I don’t have to.
No Elko, because no electrolyte…. unpolished paper wrap, tary, + metal foil
… it looks like that for me. Error not excluded….
The radio is only to be repaired by specialist noises. A laie won’t get any more. Unless he has a lot of time. If it were, a collector would be very happy about it. I have enough old radios. So please no offers. Thank you!
Images are in question, I hope you can get “Gore” :/
I’ve turned out, the front is still available and the loudspeaker (mostly) is also available. The rear wall is on top.
By the way, I did not find a tube plan or the like.
That’s nice. It is only very shameful not to bring such a device back to the foreman, but to slaughter it completely pointlessly. 🙁 Then a collector bleeds the heart.
I’d say there’s no interest in this in my class. I’m sorry I didn’t…
If you want, I can ask you a photo of the radio tomorrow. The front of the loudspeaker was probably missing.
The radio is a very shame. 🙁 Just older devices deserve to be kept alive and running for so long. The tubes can be changed. A tube plan can always be found on the back wall. And the other parts like the UKW Tuner (rotational capacitor) can be found on eBay. A skilled person can bring him back to life.
Thank you, but I wouldn’t have planned to share it anyway. This radio is missing half of the components, two tubes completely broken…
A friend brought this to school because he needed a revolving capacitor for a school project. Now that’s in the class and I’m gonna let some parts of it go (no worry, I can).
There is actually (only) tar as an insulator between the metal foils
There is no oil running out
A giant Elko
An Elco? Fascinating. But you seem to be right, the line appears to indicate the minus pole and properly polished, it discharges a bit slower than wrongly polished.
Thank you.
The part comes from the Nazi period from the trunk radio for Göbbel’s propaganda.
Here is the right replacement
https://www.cde.com/resources/catalogs/940C.pdf
Is the voltage vc or dc`?
vc? What do you mean?
Yeah, I’m sure you’re building it differently today. The capacity should still be 1uF; is not an Elko.
I cannot really measure the capacity because the insulation resistance is already so low.
But I think it’s an Elko now. Depending on the polarity, it discharges at different speeds when I charge it and my capacity meter shows different. On the one hand, probably the wrong polarity, the capacitor is supposed to have about 8uF, otherwise polished, nothing is shown to me, it measures permanently and does not come to any result.
Sorry, I missed the line under your thumb!
If you need replacement, check pollin.de.