Correct triangular / wedge-shaped belt for the tracking servo motor in the following Bang & Olufsen Beogram tangential record decks:
Beogram 3000 (tangential version only)
The original belt is wedge-shaped (triangular cross-section) for the simple reason that it requires less torque to run around the small diameter pulley on the servo motor than a similar square or round belt.
Easy running is essential in allowing the tonearm carriage a nice and smooth travel and avoid any jerking motions during playback.
A belts elasticity and friction is always very important, but even more so is the choosing of rubber material with the correct density for this belt;
It must not be to loose, – or the belt will simply come off when running fast.
And it must not be to dense, – or vibrations from the carriage servo motor will be transferred to the floating subchassis, to the platter, to the record, the needle and your speakers.
If you fit a square belt or a round belt (anything but the real soft wedge-shaped thing) you will experience that each time the tracking motor runs it will be audible as a faint rumble in the background of the music. Needless to say this is quite annoying, – not only
during silent passages in the music, but particularly between tracks, where there is no music and the tracking motor is very active.
The real belt – and of course this reproduction – was produced with this in mind.
This belt is exactly like the original; Correct shape, correct size, correct friction, correct elasticity, correct density.
This belt is a direct and correct replacement for original Bang & Olufsen part# 2732063.
This is the real thing.