NY <
[email protected]d> wrote:
I'm trying to estimate a range of dates when a recording of my grandpa
giving a talk on Children's Hour might have been recorded. We have a BBC "transcription disk" of the recording.
The transcription discs were cellulose nitrate lacquer on aluminium, the shellac mixture was only used for pressings when the number of copies
was sufficient to justify the cost of processing a lacquer disc into a
metal stamper.
When would BBC have stopped using
those and starting giving participants mag tape instead?
The changeover to tape was gradual and rolled out across the regions as
the machines and material became available. Discs which were prexented
to performers would still have been recorded on lacquer for some time
after tape was in general studio use.
If your disc is recorded to RIAA standard it would have been made
specially for presentation after 1955. If it was recorded to 'Blumlein
300 or 500" it would have been before that date. Only if it is to BBC
'D' standard (2db/octave) would it have been an internal recording
intended for playing into a programme.
--
~ Liz Tuddenham ~
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www.poppyrecords.co.uk
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