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frequency.mpg

No.5 in a series of 'Unusual 78 rpm Records'. Here we have an audio frequency test disc from about 1935, made by the Synchrophone Company, and issued on their label Octacros. It is one of a set of several discs, though I only have this one. I cannot resist playing the 1250 Hz band, and checking it against a digitally generated 1250 Hz. The record comes out fine - although there is a detectable beat frequency, because the 78 is slightly off centre, hence some variation in the 1250 Hz due to 'wow'. Still, top marks to Octacros! Their set of frequency test discs, by the way, was favourably reviewed at the time; neither was it very expensive, IIRC.