[Trevor]

"William Sommerwerck" wrote in message
...
The crossfield machines were spec'd at recording to 13kHz at 1.875ips.
That
means they had the potential to reach 100kHz at 7.5ips.

"Potential" does not mean it did, any more than the 13kHz at 1-3/4ips claim
was actually achieved in practice, or at what level. My X-V does have
15/16ips speed as well though, and I think it probably managed 5khz at that
speed. I still wouldn't extrapolate that to 40khz at 7-1/2ips however,
since by actual measurement it was close to noise by then!

Trevor.