The type of that diode is important, not the voltage / current rating so much as the "curve" the diode gives to the dynamics response. It wasn't fitted to the very early 10 cards, it was added sometime around 1980? It was certainly there by 1984.
So the main thing is that it needs to be a germanium diode, not a schottky. That said, I think on the 9k I did use a schottky because we couldn't buy germaniums any more.
They may well have changed case style, and I vaguely remember I changed the type of diode in the late 80s because the AAZ17s became obsolete?? We wouldn't have bothered updating the circuit diagram for that.
Basically if you need to replace them try to find AAZ17s if you can.
The glass case was a PITA. If you try adjusting up the dynamics card presets under (for example) fluorescent lights you find it behaves very strangely, those diodes are light sensitive. I remember trying to set up a 4k with the 611s on extender cards inside a BBC mobile studio (one of only two studio installations we ever did ourselves) and it took me ages to work out why when I put them back in the desk the dynamics were out of cal again...
Cheers,
Andy
EDIT: I've just found my 9k circuits, and I did use an AAZ17. So I guess should be that in all 10 cards as well. But different manufacturers may well have used different case styles, we really struggled to buy these so would have changed manufacturer occasionally.