A Roland RE-201 Space Echo Tape Delay that had no echo function at all. Basically it was just some bad components (capacitors) that were replaced. I also did a lot of cleaning (tapeheads, bearing, guide, potentiometer, switches, jacks), especially cleaning the contacts of the reverb tank. A new high professonal audio tape loop was applied. Demagnetized the tapeheads. Finally I did some minor adjustment on the heads.