The Jordan BossTone,
a Popular Steel Guitar Accessory of the 1970's

NOTES:

1. The PNP Transistor type is missing. It was missing from the original drawing that I copied this from. I suspect a complementary PNP transistor to the NPN type or a Radio Shack substitue (subs for both) will work as it probably is not that critical as it is being used as an emitter follower rather than an amplifier.
2. The switch is shown in the bypass mode.