Gentlemen, could anybody tell me anything about the vintage crystal set that I have won on eBay a couple of years ago. The unit seems to belong to early XX century time period. The seller had no information of what it was.
The factory label says "Gesellschaft f. drahtlose Telegraphie m.b.h. Berlin" (i.e. Telefunken, Berlin) and "Type KTK 81" (why not "Typ"??):
Here are more pics of the insides of KTK 81:
And here is the KTK 81 schematic diagram that we have made:
There is a wire antenna wound around the wooden box of KTK 81, and the detector seems to be of the Perikon type where two crystals were squeezed together to form a p-n junction.
Any ideas of what purpose would this KTK 81 serve?
The factory label says "Gesellschaft f. drahtlose Telegraphie m.b.h. Berlin" (i.e. Telefunken, Berlin) and "Type KTK 81" (why not "Typ"??):
Here are more pics of the insides of KTK 81:
And here is the KTK 81 schematic diagram that we have made:
There is a wire antenna wound around the wooden box of KTK 81, and the detector seems to be of the Perikon type where two crystals were squeezed together to form a p-n junction.
Any ideas of what purpose would this KTK 81 serve?
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