Hi Nick,
I already replaced the 603 transistor in a Juno 106
and i used 2SC1815 as a replacement according the Juno 106 service notes. It
works perfectly. And if you need a PNP, the 2SA1015 is ok.
The 2SC1815 is easily found in many
stores.
Hope this helps a bit...
Regards,
Paulo Palmieri
----- Original Message -----From: Nick BellSent: Friday, April 12, 2013 2:14 PMSubject: [vintagesynthrepair] Roland TR707
Hi,I'm working on a 707 with no midi out. I suspect Q6 which is a 603 58F - does any one know a suitable replacement & where I might source one? Could be either said transistor or IC3 which is a HD14584BP hex schmitt trigger - again, anyone know of suitable replacement? .. or perhaps the cpu is failing somehow but I doubt it. I can't scope any of it as I cant afford one yet, so my limited skills have narrowed it down to these components.Thanks for your help