Overview

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.

Product Details

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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

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