On 2015-Oct-07, at 12:56 PM, Glen Slick wrote:
> On Wed, Oct 7, 2015 at 12:46 PM, Brent Hilpert <hilp...@cs.ubc.ca> wrote:
>> 
>> I have an HP 7970A - 9-track, 800BPI - with my HP 2116. I wrote monitor 
>> commands to exercise it and do tape dumps from it.
>> 
>> They're uncommon compared to 1600 & > BPI  drives, figured that was because 
>> the 800 standard was older and saw a shorter life before being superseded, 
>> but are such drives that rare or hard to come by?
>> 
>> (I rather wished it was 1600 so I could read more-common tapes.)
> 
> I have an 800BPI 7970B in a 2113B rack system. I've never gotten
> around to trying to get it up and running. Are they fairly reliable
> drives to get going again? I don't have any other 800BPI drives to
> write any tapes to read with it.


Well, the unit here was in pretty good physical condition as received.
It had a cascading failure in the capstan driver but it was a fairly 
straightforward fix.
I think there was one sluggish/partially-seized pulley bearing (freed up with 
some oil).

Pretty rugged drives as you know. I wonder about the capstan rubber in the long 
term but I think that's about the only thing to worry about on age alone.

I think bitsavers nowadays has manuals and schematics for the B version as you 
have, years ago I had to do some reverse-engineering for the capstan repair.

This page is over ten years old and needs some updating, but FWIW:
        http://www.cs.ubc.ca/~hilpert/e/HP21xx/HP2116CSys/index.html
Note the tape drive repair log page linked there.

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