ReVox B77 MKII changes tempo?

Hi,

Just got this B77 MKII. It’s in mint condition and works fine. I’ve been printing loads of stuff through last couple of weeks, solo tracks, full mixes and so on.

But iv’e only used it at 15 ips, then I wanted to try out how it sounds at 7.5 but when i print/record at 7.5 it slows down the tempo of the recording? Never experienced that before with any machine, any thoughts?

I know there is the slight delay between the erase head and playback but this is not that, it actually slows down and plays the tempo at lower bpm. As I would’ve turned a pitch knob or something (which I haven’t and there isn’t one on this machine)