Echo 231 Z radio receiver

The Echo 231-Z radio is a luxury, four-valve reaction receiver, allowing reception of radio signals in the short, medium, and long wave bands. It has two circuits and a built-in electrodynamic speaker. It was equipped with tone controls and reception strength adjustment, and it also has a scale, a built-in antenna and sockets for connecting an additional speaker and adapter. The Echo 231-Z was produced from 1936. Państwowe Zakłady Tele- i Radiotechniczne (PZT) also manufactured similar designs named Echo 232 and Echo 241 (both with roller doors). There were also other radio models sold under the common name Echo that were assembled from Polish components. Some of the models were made for the purposes of the postal service and on a commission from the Minister of the Interior (these were the so-called “municipal radios”). Manufacturer: Państwowe Zakłady Tele- i Radiotechniczne, 1938 Inv. no.: MIM973/V-229 Model prepared on the basis of photogrammetric measurements Licence: CC BY-NC-SA