Made in Hungary, "BRG" Co., in 1968.
There was only one tape recorder in Europe with dual system. The "BRG M-11" was an open-reel tape recorder and casette recorder too, "2 in 1" machine, like a "house-studio".
There was a great technical challenge, but the BRG gave the answer in high level.
Frequency response:
-Open-reel recorder:
40-16000 Hz (19,05 cm/s)
60-15000 Hz (9,53 cm/s)
60-8000 Hz (4,76 cm/s)
-Casette recorder:
60-10000 Hz (4,76 cm/s)
This very nice machine has beautiful sound! The head-constructor of the mechanical unit was Marcell Jánosi, and of the electric unit was Csaba Somlai. (This informations are from the book: "The History of the Fabrication of Tape Recorders in Hungary" -written by Vilmos Nagy, the owner of the museum)