Re: Sony TC-645 1/4 Track R2R Erase Head & Issues
Thanks for the info David - interesting to compare the machines.
Yep, it appears that Sony's TC-645 alternative design with a different auto-stop mech (under the take up spool) has left the erase head exposed to tape friction during FF/RW.
Yesterday, I lined up a steel rule between the erase head and the tape lifter, and that very line ran ahead of the take-up tape guide - so erase head tape rubbing is unfortunately inevitable.
ITMT, here is an underside shot of the 645's head assembly mechanisms - by default the Tape Lifter is active (ie for the RW/FF state). I've labelled the relevant plates. It's quite easy to work out the mechanical logic of the system.
Eric.
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