Devised, researched
 and written
  Peter King Smith BSc

                                                         The mid-1960s, German-built multi-track tape recorder with FM/AM/SW radio

The 6000 Stereo Model

Unlike the 5001 model, the 6000 stereo music center had:
• 81 tracks 

• A tape run of 22 minutes, providing 29.7 hours of recording 

81-track tape recorder
Interestingly, the stereo versions of the Schaub-Lorenz Music center (6000 model) had an 81-track tape (9 sectors x 9 tracks), not 126 tracks as you might expect. This is because stereo models needed two tracks - and therefore two recording heads instead of the normal one - in order to magnetically record the two stereo channels parallel to one another on the tape.

However, this 81-track stereo tape recorder unit only offered a total playing time of 29.7 hours, far fewer than the standard 5001 (mono) model. The actual number of tracks used to record in stereo required the tape to be wide enough to hold 162 parallel tracks on the 10 cm wide (broadband) tape. 

Photo: Schaub-Lorenz Music Center 6000 stereo chassis
Erfurt, Germany, May 2008

Track-selection dial for the 6000 chassis
The photo above clearly shows that the track-selection dial contains nine sectors (A to J, missing out the letter 'I'), with each sector split into nine subsectors, giving a total of 81 tracks.

6000 model aimed at US export market
The 6000 stereo version of the 5001 music center was intended for the US market, and was fitted with a 110 V power pack unit, and was advertised as the Stereo Tape Recorder 6000.

These chassis were sold without a cabinet, a stereo (radio) receiver or a stereo amplifier. General Electric in the United States bought a batch of these 6000 stereo chassis, installed their own stereo receivers and stereo amplifiers, built their own cabinets and sold the resulting stereo music centers to the American consumer.

Who bought them?
Some of the 6000 stereo chassis ended up (back) in the UK and the Netherlands, and were bought by radio and electronics enthusiasts who either built them from a kit and a set of instructions, or bought them as a ready-made stereo chassis. However, neither were sold with a cabinet, a stereo tuner or a stereo amplifier; these all had to be purchased separately or installed by the radio enthusiast himself.

Dutch link
A company called Radio-Service 'Twente' NV, based in Goenewegje 14, The Hague, was selling these stereo chassis and spare parts by mid-1969.