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Old 11th Dec 2021, 11:21 am   #6
TIMTAPE
Octode
 
Join Date: Jul 2006
Location: Perth, Western Australia
Posts: 1,756
Default Re: Are these Revox tape heads scrap?

Quote:
Originally Posted by Ted Kendall View Post
...Incidentally, I think the quoted breakpoint was at 4mm...
Thanks for the correction, Ted.

Quote:
Originally Posted by Ted Kendall View Post
...although I did use one set of heads far further than that - I had to admit defeat when the gap collapsed on one side of the playback head - at all but 6mm! Curiously, the head showed no obvious deterioration before that. I wouldn't bank on that sort of luck, though.
Yes I think I read somewhere years ago that a playback head increases in HF efficiency right up until the eventual opening of the gap, then it's all downhill, whereas a record head needs a certain minimum of metal remaining in order to fully magnetize the tape.
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