Need help with Rodgers S-200 amp wiring

[twnelson]

Yep, exactly like the S-100s. Anything from 12-15VDC will work.

--- Tom

[kafer]

An old Rodgers 110 was removed from a church, but 2 lovely wall-mounted speaker cabinets were left behind along with the 2-channel Rodgers S-200 amp that drove them. The organ was replaced with some sort of midi-only organ console attached to an apple computer, with no external audio. I was asked to help mate this thing to the S-200. So, I can see on the amp, it uses 5 pins out of the 9 on the connector. The pins are:
1 -- audio ground
2 -- channel A
3 -- channel B
6 -- relay -
7 -- relay +

The midi control device between the console and the computer has 2 output channels, so it seems simple enough to hook those up to the right pins (1, 2, and 3), but my question is what do I do with pins 6 and 7 to simulate the signal from the Rodgers organ to turn on the amp? Did the Rodgers apply a 15VDC current, similar to the S-100 series amps? Any suggestions on how to get the amp to power up would be appreciated. Thx.