As heard from previous messages the TU10 would be capable of reading 7 & 9
track tapes.
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A TU10 transport WITH A 7 TRACK HEAD can read a 7 track tape.
Good luck finding one.
For a PDP11, the interface was a TM11. There were master and slave
TU10 transports. The parity and lrcc circuitry only exists in the
first (master) transport. The interface between the drives is DEC's
old 'negative' logic.