[Trevor]

"John Williamson" wrote in message
...
I had an Akai X-IV portable until my last house move that would play back
the crossfield bias signal.

Still have an X-V somewhere :-)
(I doub't it still works since it hasn't been turned on for a couple of
decades however.)

Would that count?

Nope, it would't record and play back an *audio bandwidth* of 100kHz as
claimed.

Trevor.