[Vintage-Audio] Scotch Audio Tape Variations

[Gerry Steffens]

Not sure of the difference between the two Scotch tapes but the back coating
is there to reduce the level of print through.  When tapes are wound and
remain that way for longer (or even shorter) periods of time the magnetism
from one layer will "print through" to the next layer.  This is particularly
true of loud passages.  Minimizing print through was one reason we left
tapes tails out at the radio station when I was a DJ while in college a
little over thirty-five years ago.

Gerry


Collecting & Restoring since 1959
Gerald Steffens P.E.
Oronoco, MN


-----Original Message-----
From: vintage-audio-bounces at mailman.qth.net
[mailto:vintage-audio-bounces at mailman.qth.net] On Behalf Of Duane B.
Fischer, W8DBF
Sent: Saturday, February 19, 2005 5:57 PM
To: vintage-audio at mailman.qth.net
Subject: [Vintage-Audio] Scotch Audio Tape Variations


	
Hi All, 	
	
What is the 'real' difference between the seven inch reels of Scotch autio
tape
#207 and #227? 		
	
I weighed each on a postal scale, as I thought the #227 felt heavier to me.
The
#207 weighed 13.5 ounces and the #227 was just under 14 ounces. 	
	
Both appear to be very high quality, the #227 I am positive is commercial
grade,
as it has the black/gray oxide. 
	
Additionally, what was the thinking in the 'back coating" of audio tapes?
The
reddish oxide on one side and black on the other.  		
	
Thank you. 	
	
Duane W8DBF	

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