This is an old "Werkometer TG-1" - a variable AC voltage isolating transformer. It is used to gain some safety against electric shock while repairing old radios and other mains-connected hardware (by providing galvanic isolation).
![](https://blog.noq2.net/content/images/werkometer-0004.jpg)
The unit´s circuit plan for those interested:
![](https://blog.noq2.net/content/images/werkometer-0003.jpg)
Inside, we find a huge copper ring coil:
![](https://blog.noq2.net/content/images/werkometer-0001.jpg)
Here another shot:
![](https://blog.noq2.net/content/images/werkometer-0002.jpg)
greetings noq2
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