This is 3 bands Detector Receiver DETEFON PZT made in Poland since 1929
This is hard to find early Detefon - PZT ( see logo on the front and on the and on the variable tuning capacitor).
After over 70 years this radio become rare and hard to find even in Europe. Most of them were destroyed during World War II.
The detector receiver was invented by W. Rotkiewicz.
This is 3 bands radio:
1 : 200-400m,
2 : 300-700m,
3 : 1200-1700m.
The bands are switchable by front 3 position switch. The tuning can be made by turning the knob on the capacitor.
Two pairs of headphones connected simultaneously at 2000 oHms.
Great rare find.
The detector come with Alinco Magnetic headphones .
DETEFON PZT Detektor Empfänger 1933
Großes altes Einzelteil. Der Fall ohne Sprünge, der Katze Whisker hat ursprünglichen Galenakristall.
Dieses ist der Detektorempfänger DETEFON hergestellt in Polen von 1929 von PWL und später von PZT.
Der Detektorempfänger wurde von W. Rotkiewicz erfunden.
3 Bands:
1 : 200-400m,
2: 300-700m,
3: 1200-1700m.
Schaltbar durch Frontseite 3 Position Schalter.