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Soviet fluorescent tube positive terminal pin melted bakelite insulator from heat?????????? WTF happened here???

Soviet fluorescent tube positive terminal pin melted bakelite insulator from heat?????????? WTF happened here???

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I noticed that all four of my Ukrainian PZGRL (Poltava) made F40T12 tubes from 1994 has one of the pins loose, because the bakelite insulator has melted around the one pin witch I believe is the pin that has been connected to the positive terminal however it was connected to the fixture and the one terminal on one side of the fixture became the + or positive or "hot" terminal. In normal plug sockets this also occurs frequently when the only slightly melted side is the positive terminal that becomes hot from sparking when you plug in a powerful item aka vacuum cleaner or space heater. But for hell's sake this is a 4-footer, it only draws 40 watts. How the hell the tiny spark it generates could become so hot it melted BAKELITE????? Have you ever seen this on american tubes?

IMG_20190918_205635.jpg IMG_20190624_001708.jpg IMG_20190624_001605.jpg IMG_20190421_133351.jpg

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Album name:vytautas_lamps / Random home-made projects
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Date added:Jun 23, 2019
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Date Time:2019:06:24 00:24:27
DateTime Original:2019:06:24 00:16:08
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don93s
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Jun 23, 2019 at 08:43 PM Author: don93s
Looks like the electrode wire wasn't properly soldered or welded to the inside of the pin which may create a small but steady arc. Even though the current may be only .43a, the small arc can still generate enough heat to create a burn. This seems unusual for only 220v open circuit voltage, but this is my best guess. In the States, I've seen this happen quite often with higher voltage ballast such as slimline, /HO, or electronic T8 with a voltage of 600v; where lamp is not properly seated into socket or bad socket.
Discolightman
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Jun 23, 2019 at 08:50 PM Author: Discolightman
I seen where one side gives out and that side becomes black and clear
Ash
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Oct 08, 2019 at 03:47 PM Author: Ash
The pin that burned is the one that had the continuous lamp current, and it does not matter if its L or N side (it would butrn on either side if there is a bad connection). The pin that survived is the starter loop, it only carries current momentarily when starting (except if the starter is stuck)

With RS ballasts both pins carry significant current all of the time so there wouldn't be this difference
Men of God
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jiachao.wei.71 chao_813975447 UChyTpXvlQ8ZCfBPP_lJjubg chao990613
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Oct 08, 2019 at 08:37 PM Author: Men of God
我遇到过T8 18W灯管的绝缘片烧焦的情况,然后灯管直接安不上灯座上面,电流也就0.37A,最后灯管报废了…

我不会英文,所以我用中文,请你们用翻译网站翻译我打的字!

I can't in English, so I in Chinese, please use the translation website to translate my words!

Pyte
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Nov 11, 2019 at 01:58 PM Author: Pyte
Something similar happened to this what I described as answer at your comment at my tube:
https://www.lighting-gallery.net/gallery/displayimage.php?album=lastcom&cat=0&pos=50&pid=56297

LED-lighting is pseudoscience.
LED-lighting is only a generated demand.
LED-lighting came to life simply by business interest.

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