Restoration of old Soviet electric transformer from the 60s went wrong

This video is about the restoration of an old and rusty electrical transformer made in the USSR in the 60s and what came of it.
I needed an adjustable transformer for one of my DIY projects. To be able to regulate the voltage from 110 to 250 volts.
For example, you can not use the electrical equipment from Japan in
the United States or Europe. The voltage in Japan is
100 Volt, which is different from North America (120V), Central Europe (230V),
and most other regions of the world.
I've bought this transformer at a flea market for very
cheap. It was in poor condition and sold "as is".
Technical data:
Two adjustment ranges 87 - 137V and 143 - 245V.
Power - 250W.
Operability: unknown.
Timestamps:
00:26 - Start testing
00:29 - Short circuit and small explosion
00:44 - Disassembling
03:53 - Grinding
05:23 - Sandblasting
06:00 - Sanding
07:53 - Painting
09:58 - Light bulb soldering
12:10 - Slider repair
12:28 - Sanding small parts
13:09 - Some polishing
14:19 - Some washing
15:03 - Start assembling
16:51 - Final result
Restoration.
WARNING: ELECTRICAL HAZARDS
Never use a damaged extension cord.
Never use a defective electrical device.
Always unplug the device before disassembling it.
…
Not sure? Don’t take any risks with electricity. Speak to a master electrician.
I broke the first rule :( The cord was damaged, it had a broken off construction brace or a nail in it, which I did not notice.
00:29 Short circuit, a small explosion, and the light went out.
Fortunately, no one was hurt. The transformer remained intact only the power cord burned out.
I took apart the transformer and used a pneumatic grinder to get rid of the rust. In some places, the rust was too deep so I have used my DIY sandblasting cabinet.
It was the first time I have used my sandblasting cabinet and sandblasting in general so not everything went smooth. The suction hose was not fixed to the hopper so during operation, the sand supply periodically disappeared. I only sandblasted the top cover and decided to finish it all with good old manual sanding.
After the sanding, I’ve painted the body with gray hammered paint. The transformer was originally painted with some cool paint. I don’t know what is it. If you know please comment below. I think the hammered paint was the closest option to the original. Also, hammer paint does not need a primer and can be applied with a brush.
I checked the electrical part of the transformer and everything turned out to be fine. I replaced the power cord and the plug. The cord is modern but looks vintage. The plug is original from the 50s-60s. I didn’t found a suitable light bulb so I’ve soldered a modern led and made a cover for it with a 3d pen. I love to bring something from myself to the restoration.
The slider mount was broken I’ve repaired it with a 3d pen also. After the assembly, I have checked the transformer working capacity and everything was fine.
It's all for today.
Thank you for watching.
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[@ricardogaraycochea1939]

Un muy buen trabajo de restauración puesta en valor del transformador 🇵🇪

[@jl2622]

Hmm, never seen that kind of painting.. Awesome before and after

[@RESTORATIONOFSCRAPMETAL]

I loved this restoration, you did a good job! 👍

[@RestorationNext]

Thank you very much!

[@RESTORATIONOFSCRAPMETAL]

@@RestorationNext You are welcome!

[@christianschreuder6628]

the paint looks very much like Mica a very good electrical insulator

[@2DMax00]

"paint" looks like galvanization; they probably dipped it in zinc and let it slowly crystalize.

[@RestorationNext]

very likely

[@petercolquhoun2086]

Certain types of galvanizing were banned in the U. S. due to high lead content. 1965 Soviet Russia? Perfectly safe.

[@danielg.vgremio83]

Totalmente excelente 💡

[@agustiarhidayat5777]

Good job bro 👍👍💪

[@RestorationNext]

Thanks ✌

[@shahinshiblu3848]

Good job bro🥰🥰🥰

[@instrumentfixer35yearsexp90]

You need to have used a grounded line cord. incase, years from now a wire comes loose and contacte the metal case

[@RestorationNext]

yes, I've missed that :)

[@teslacoiler]

A variable autotransformer should adjust the voltage smoothly and without any flickering. I think that the expose surface of the windings is too much oxidized and need a touch with a very fine sandpaper. Grounding the case is also advisable.

[@RestorationNext]

thank you for the info. I didn't know that.

[@teslacoiler]

@@RestorationNext you can also remove the rotation limiters to allow the full rotation of the graphite wheel across the core. This allow the transformer to works with a lower voltage power grid (be careful, if the grid voltage is normal you can also exceed the upper limit and blow the bulb). If you want the full rotation but you don't want exceed 250V you can also move the input tap further away from the windings (note: if you place the input tap somewhere in the middle of the coil the autotransformer will be able to both decrease and increase the input voltage, conversely, if you place the input tap at the end of the coil, the autotransformer will be able to decrease the input voltage only). For a better solution, you can place one input at 3/4 of turns and another one at the end of the coil and use the voltage selector as switch. with this solution you can select between 0-to-100% or 0-to-133%

[@jonathanberton]

Mica painting? Mica is well known for EM isolation (used for internal couch of roof in Maya/Aztec cities)

[@PAPA_PSIX]

Стабилизатор напряжения для телевизора

[@ghassanalniser3261]

If you speed up the pace of work in the video

[@RestorationNext]

in latest videos I did so :)

[@Rubarb555]

I have seen some hammer finish paint on soviet gear before, maybe this is something like that gone wrong, a failed mixture, but good enough for the comrade 😁

[@Elkam]

🇦🇿🇦🇿🇦🇿🇦🇿🤙