T does not mean tape. It means Transfer, as in Transfer from 16-inch Western Electric Wide Range Vertical master disc. That also is what the W on Deccas stands for. Notice the missing W on the non transferred one?
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From: Association for Recorded Sound Discussion List <[log in to unmask]> on behalf of Mickey Clark <[log in to unmask]>
Sent: Friday, February 19, 2021 3:25:41 PM
To: [log in to unmask] <[log in to unmask]>
Subject: [ARSCLIST] Decca 1945 take numbers
Hello-I have two copies of Decca 23547 – Siboney and Hasta Manana by bing Crosby with Xavier Cugat.
Both sides have this aberration.
Siboney on the Canadian issue – the MX is L3535B – dating from February 11, 1945
Siboney on the American pressing is WL3535T6B
I am just recording the one with the T and will compare the recordings once recorded.
Does a firm date exist for when Decca started mastering on tape? I have seen this before, but on records that would have preceded the tape process - Mickey