[sdiy] Mystery Vactrols/Photocouplers

[BrightBoy]

All:

I'm in the process of reverse engineering the tri-stereo chorus
rack unit and I'm wondering if anyone recognizes the two
photocouplers that are used in this device:

http://www.mindspring.com/~jdec/gtr/mystery.jpg

The device with the "4G" marking has two leads on one end
and 4 leads (2 pairs) on the other.

The device with the "4H" marking has two leads on each end.

Any help would be greatly appreciated!!!!

Cheers,

Jeff