MMC6000

Bang & Olufsen’s (then) most accomplished pickup cartridge was fitted to Beogram 6000.

The MMC principle was adapted to track 4-channel records: both Quadradiscs and SQ. MMC 6000 would track both mono and stereo records with the utmost fidelity. It was designed for record-players with tangential arms. The stylus was the Pramanik diamond, named after its inventor: engineer S K Pramanik from Bang & Olufsen’s Laboratories.

The diamond’s radii were 7 um/2 x 50 um. It was a refinement of the elliptical shape, rather like the shape of the cutter-head, and enabled greater contact with the undulations of the record groove. The cantilever was made of berylium – a material which is harder yet lighter than popularly-used aluminium. Effective tip mass was 0.22 mg. Compliance was higher than 30×10-6 cm/dyne. Recommended- stylus pressure was 1g. The total frequency range was 20-45.000 Hz.

In the audible range: 20-15.000 Hz there is less than 1.5 dB variation and in the inaudible range 20,000-45,000 Hz where the carrier frequencies lie, the pick-up fulfils RCA/JVC’s specifications for a Class A discrete 4-channel pick-up cartridge. Each cartridge is an integrated, individually calibrated unit. The stylus unit is not separately replaceable since it is part of the integrated unit. An individual frequency response curve traced on a Bruel & Kjaer level recorder and a complete Calibration Card were enclosed with every MMC 6000 sold.

 
 

MMC6000 Product Details

Type Numbers

Please let us know​

Designer

Please let us know

Manufactured

1974 - 1979

Colour Options

Silver

MMC6000 Product Specification

Pramanik diamond
Radius of curvature CD-4 quadro
Frequency range 20 – 15000 Hz+/- 1,5dB 20 – 45000 Hz (CD4)
Channel separation 1000Hz >25dB
40 – 10000Hz >20dB
Channel difference <1,5dB
Intermodulation <1%
Recommended stylus pressure 1g
Compliance 30 x 10(-6)cm/dyne
Effective tip mass 0,22mg
Output mV/cm/sec. 0,6mV/47kOhms

Gold or Silver membership required to view documents

Available documents are listed, if none are listed then please reach out to see if we have them.

MMC6000 FAQs

Please let us know