Vintage Synth Repair

Hi guys,

I have a question about the Moog 901B Osc.

Looking at the schematic here:

http://www.freeinfosociety.com/media/images/4142.jpg

I see the +12v, -10v and -6v points noted - but I am also seeing three points marked +11.5v

Where was this +11.5 derived from originally?

If you look at the connector strip pin-out on the bottom right - there is no +11.5v coming in..!

Cheers,
TOM