Yamaha OD-10M II

In used but great condition, works perfectly.

These classic Japanese pedals are still criminally under-rated. At a time when Boss was king, other Japanese companies were innovating in order to keep up - and manufacturers like Ibanez and Maxon (obviously) were competing with Yamaha, Aria, Arion and Guyatone locally. There's a lot of very cool boxes from this period, and they are mostly overlooked because they often didn't leave Japan or they were dismissed at the time.

To me this pedal has a lovely organic breakup that is easily controlled from the volume knob. You can hear a demo of a Yamaha OD-10Mii below - courtesy of Roger Brainard's youtube channel. I think this gives you a good idea - and point of comparison with the tubescreamer.