good working organ mate reverb. I got this out of a Hammond M3 organ. it was kinda weak sounding when I first turned it on so I put it on the bench and replaced 3 capacitors and a resistor in the power circuit. also replaced the 12AU7 tube which was a little weak.. now this baby sounds sweet. very sweet inline reverb. in line mean whatever you play the organ through the reverb will be there as well. it becomes part of the signal. this is not at all separate like the A100 or M100 have.