Wondered about this one for a while (but always suspected it was YATS). The best way to describe the Lightspeed (that I can think of anyway) is it's kind of like a Timmy with the bass and treble controls fixed and a simple treble cut tone control added just before the volume pot. The most interesting thing with this is the clipping, with 5 diodes in asymmetrical orientation (3 going one way, 2 going the other). Should fit in a 1590B or 125B nicely with board mounted pots.
![]()
