Voimaradio Oy, the company of Finnish HiFi-inventor Tapio M. Köykkä, manufactured in 1960’s and 70’s an Ortoperspekta tube receiver/amplifier under the name VOIMA OP-3. Ortoperspekta is a stereophonic system developed by Köykkä, design by Yrjö Turkka. It reproduces a two-channel stereophonic signal through three loudspeakers. Today Voima tube amplifiers are rare and an essential part of Finnish HiFi history.
145x335x465 mm.
Function not tested.
Literature
Ortoperspekta:
https://fi.wikipedia.org/wiki/Ortoperspekta
Tapio M. Köykkä: http://www.kolumbus.fi/~epap/voimaradio/
Voima OP-3 Circuit Diagram: http://www.hovirinta.fi/audio/putkitekniikka/HIFI_vahvistimet/kaupalliset_vahvistimet/Voima-radio/OP_3/Voima_OP_3_kk.htm
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