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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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Old 4th Nov 2017, 3:16 pm   #1
SteveCG
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Default 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.
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Old 4th Nov 2017, 5:56 pm   #2
mitajohn
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Default Re: EMI Test Tape T.B.T. 1

May be this helps:

http://www.vintage-radio.net/forum/s...ad.php?t=62985
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Old 4th Nov 2017, 7:35 pm   #3
Ted Kendall
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Default 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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Old 6th Nov 2017, 2:13 pm   #4
SteveCG
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Default Re: EMI Test Tape T.B.T. 1

Thanks John and Ted.

As was said back in 2010 - it can be a little confusing...
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