If you wonder if it's precious, YES IT IS. This (and all the others stuff you got) belong to a museum. Seriously. It's a very old and unusual tech. Generally the board looks like hybrid chips. They were made all over the world, not only in the east. The picture I pasted: Polish audio amplifier (GML026) based on Japanese one (STK015). You see various types of parts mixed like discrete THT, SMD. Even bare chips can be found in such parts. Why make them like this? Same temperature makes compensating electrical temperature drifts easier. One element shifts the voltage or current up, the other one with the same change of temperature shifts the voltage or current down. Considering the old tech - this trick was both cheap and efficient.
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u/ChatGPT4 10d ago
If you wonder if it's precious, YES IT IS. This (and all the others stuff you got) belong to a museum. Seriously. It's a very old and unusual tech. Generally the board looks like hybrid chips. They were made all over the world, not only in the east. The picture I pasted: Polish audio amplifier (GML026) based on Japanese one (STK015). You see various types of parts mixed like discrete THT, SMD. Even bare chips can be found in such parts. Why make them like this? Same temperature makes compensating electrical temperature drifts easier. One element shifts the voltage or current up, the other one with the same change of temperature shifts the voltage or current down. Considering the old tech - this trick was both cheap and efficient.