I'd go to the Athana site, they have some degaussers and a nice write-up
about what can (and can't) be safely degaussed
2017-04-30 11:38 GMT-03:00 Mike Loewen via cctalk <cctalk at classiccmp.org>:
Looking for recommendations for a bulk tape eraser for SDLT and DLT IV
tapes.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology
http://q7.neurotica.com/Oldtech/