In those days locomotives were my great passion, steam locomotives were clearly at the top of the list of the favorites. Well, the steam engines got less and then, at Christmas a "Radioman" was lying under the Christmas tree. There were many components as a diode, a transistor, both of course, with a glass housing. The transistor was mounted in a round yellow socket, and you could build an NF-amplifier. (Another HF transistor with green socket was an extra to buy ).
With the available components, a coil in size of toilet paper role, variable capacitor with one plate and diode a receiver could be build with an audioamplifier. Said and done. And there really was something comming out of the black headphones, hard to believe. In the evening there where a lot of stations to hear.
With all the way turned out capacitor I heard Radio Prague with German program and the request to send reception report
So I did.
Frequency indication: Full unscrewed capacitor.
And it is hard to believe, there was response from Prague, my
first QSL card!