looking for a 7-track reel tape controller

[Christian Corti]

On Wed, 7 Aug 2019, Michael Thompson wrote:
> can be connected to both 7-track and 9-track drives. The TU20 drive on the
> PDP-9 at the RICM is a 7-track drive. The only difference between the
> 7-track and 9-track versions of the TU20 is the tape head. All of the tape
> drive electronics is the same for both versions.

The same is true for the HP 7970B tape drives, I even have a 9-track 7970B 
that can be switched between 200, 556 and 800 bpi. I only need a 7-track 
head...

Christian