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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc. |
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4th Nov 2017, 3:16 pm | #1 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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EMI Test Tape T.B.T. 1
Has anybody any information on this 1959/60 era, 1/4 inch Test Tape? In particular what speed(s) and what replay equalisation time constant it was designed for.
Thanks. |
4th Nov 2017, 5:56 pm | #2 |
Pentode
Join Date: Sep 2005
Location: Athens, Greece
Posts: 196
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Re: EMI Test Tape T.B.T. 1
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Regards, John |
4th Nov 2017, 7:35 pm | #3 |
Dekatron
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,657
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Re: EMI Test Tape T.B.T. 1
I think TBT1 was 19cm/s, CCIR , which at that time meant 100uS. Most European test tapes were recorded at 320nW/m, expressed as 32mM/mm at the time.
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6th Nov 2017, 2:13 pm | #4 |
Nonode
Join Date: Jun 2009
Location: Herefordshire, UK.
Posts: 2,495
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Re: EMI Test Tape T.B.T. 1
Thanks John and Ted.
As was said back in 2010 - it can be a little confusing... |