TK50/TK70 Info

Warner Losh imp at
Thu Aug 27 23:46:19 CDT 2015

I can confirm that back in the day (has that been 25 years ago now?) I was
able to read a couple of TK-50's I'd made in school with a TK-70 that I had
access to through a friend's work.

Mind you, even new the TK-50 was a woe-be-gotten piece-of-xxxxx that worked
right about as often as the Cubs win the World Series. I can't imagine the
pain and suffering that you'd go through today to read one.

But good luck! Maybe I just had a run of bad luck with them...


On Thu, Aug 27, 2015 at 10:39 PM, Mark J. Blair <nf6x at> wrote:

> If I'm not mistaken, TK70 drive can read but not write TK50 tapes.
> I have very limited experience with this family of drives so far, but what
> little I have is not good. Pictures:
> Maybe my tapes need baking or something to keep the oxide from shedding? I
> haven't tried it yet. Unfortunately, my failure mode results in a
> labor-intensive fiddly manual tape extraction job followed by manually
> rewinding tapes into cartridges designed to make it very difficult to do
> anything manually, so I haven't found the motivation to resume
> experimenting yet. If and when I resume experimenting, I might look into
> making some sort of gizmo to let me unlock the two cartridge spool locks
> and then manually rewind the tape, without needing to disassemble the
> cartridge with springs popping out all over the place. Maybe something 3D
> printed the depresses the latches, with a crank that engages the spool?
> --
> Mark J. Blair, NF6X <nf6x at>

More information about the cctech mailing list