Bang and Olufsen introduced the world's first tangential-tracking turntable (Zero tracking error) - the BeoGram 4000, in 1972. It has a permanent place in the NY Museum of Modern Art. The updated models (produced from 1974 to 1980) were available as the BG4002 - a stereo version (without a builtin RIAA amplifier), and as the BG6000 quadraphonic version with a built in CD4 demodulator / RIAA amplifier.
This superbly designed and over-engineered BG4002 / 6000 version remains the most widely still available today, and with proper maintenance will last 100 years, if not more. This article describes how to perform a complete restoration of this model, including taking care of all known failures and defects. The Manufacturer's Service Manual, available from BeoWorld, is an integral component of the proper restoration process. There are slight differences in the circuits between the various types, but these are covered in the individual Service Manuals, available on this website. This article covers, by and large, the following BeoGram type numbers:
- Beogram 4000 - 5215
- BeoGram 4002 - 5501 , 5503 , 5504 , 5511 , 5513 , 5514 , 5521 , 5523 , 5524
- BeoGram 4004 - 5525 , 5526 , 5527
- BeoGram 6000 â€“ 5502 , 5505 , 5511 , 5515