hi- so im replacing a drive belt - non present - ive measured the size with string - what is the reduction percentage please?
Careful selection of a replacement belt, if original specs aren't available is important.
Of course the width riding in the pulleys must be the same.
For flat belts, thickness is also important.
But more importantly, the actual tension of capstan drive belts has to be the same within a tiny window to insure correct speed, since too tight a belt can slow down some drive motors.
In some cases, the motors have a speed adjustment that should be checked against a test cassette tone along with a frequency counter.
Of course the width riding in the pulleys must be the same.
For flat belts, thickness is also important.
But more importantly, the actual tension of capstan drive belts has to be the same within a tiny window to insure correct speed, since too tight a belt can slow down some drive motors.
In some cases, the motors have a speed adjustment that should be checked against a test cassette tone along with a frequency counter.
OK, my suggestion worked for me when sourcing replacement belts from cpc: https://cpc.farnell.com/c/audio-visual/av-spares
However, reducing diameter by, say, 10% is more the answer you are looking for.
However, reducing diameter by, say, 10% is more the answer you are looking for.