In the late sixties Lenco released the Lenco Silvretta HF-TR* receiver. The power amplifier electronics was designed and produced by Lenco Switzerland. It had a built in loudspeaker from Audax that Lenco also used in some of their portable record player. There was a socket for a tape recorder, a socket for a record player and a socket for an external loudspeaker. The HF-TR receiver module 6839.02 was manufactured by Sondyna AG**.

Lenco Silvretta

front view

Output power:

Distortion:

Frequency response:

Input sensitivity DIN sockets:

4 W into 5 Ω

< 2.7 % @ 4W

40 Hz - 20’000 Hz ± 1 dB (only amplifier part)

400 mV

Lenco Silvretta

rear side

Lenco Silvretta inside view

the amplifier module is the Lenco V 220

in the background the Audax loudspeaker

Sondyna HF-TR

module 6839.02

* HF-TR (Swiss telephone broadcasts services) was a 6 channel RF distribution system that run over the telephone network from the Swiss PTT - the only Swiss telephone company at that time.

**Sondyna AG was a Swiss manufacturer, importer and distributor for home electronics.