Tefifon KC-1 / Ra with 1 audio tape. The Tefi Tefifon KC1/Ko is a particularly ingenious 1950s device, which is able to play plastic audio tapes. The tape is mounted in a closed tape in an endless loop (Greek: tefistape). The mechanical sound tracks are cut into the tape next to each other (spirally), and are mechanically scanned by a needle, just like with a gramophone record. Brand name: Tefi Manufacturer: Tefi-Werke GmbH & Co. K.G., Porz Country of origin: Germany Product name: Tefifon, Heimsender Type KC-1/ Ra / Köln 1 Year of production: Ca. 1950 Application. Tefifon tape deck Tape speed 19.05 cm/sec Tape dimensions 16 cm maximum Number of tubes: 3 220 V AC, 15 W, 50 Hz Will be well packed and shipped.