Looking at the schematic, the diode appears to be there to put a "decay tail" on the ride sound. The schematic only calls it out as a germanium diode. I'd try a 1N34A or a 1N60. 1N60 is easily available on eBay. I'd expect the higher voltage drop of a silicon diode to make SOME difference in the sound, but probably not much.

--- In tr-707@yahoogroups.com , Marc BORRI <arkan23@...> wrote:
>
> Hello Guys - I am new here :)
>
> I got a 707 recently, with 2 problem : the left main input is broken,
> and the ride channel silent.
>
> I open the beast, and to change the jack output seem fine, however i
> won't find the same part - but no big deal.
>
> For the ride, i have spoted a broken part : the glass diode D17. it
> was physically broken.
>
> I am having trouble founding the spec of the part, even by checking
> the schematic. I have did a test with a random diode, and oh miracle :
> my ride was back - super low in the main input, but at the normal
> level at the individual out !
>
> Can anyone could help me find - identify this part or if I contact
> Roland, would they provide me with those details
>
> Marc
> --
> .::GT °Hyp °23::.
>