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Re: JAM-1969-11-17@44=Receiving_Compliments-v2

Messages in this topic: 6 View All
badger danceDec 6, 2011

From the original description of the 'fault' I think the speed variance follows a triangle waveform. http://www.kpsec.freeuk.com/images/triangle.gif

With speed on the Y-axis rather than voltage/current. (Too fast/too slow)

With a variable speed playback feature on a media player, you could not vary the speed to match a particular wave function but set it at so many percent faster or slower than normal. If there was a variable variance in the original recording speed you could not manually correct for this by hand with a variable speed playback control. It could only be done reliably digitally.

During the 1970s the BBC started using the Studer A80 tape machine of which the later models carried a vary-speed feature, but this was only enabled on playback as I recall, and it only offered a manually set percentage speed change.

Certainly during the 1970s-90s both the Radio Theatre (Or 'Concert Hall' as it was then called) and the Paris Theatre on Lower Regent Street were equipped with the older Studer B67 tape machines, as I recall.

Just in case it is not obvious I used to be an engineer at the BBC during this time.

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