The 01 series stuff is awesome. This little snarler has  a pair of the iconic JRC4558D op-amps under the hood, just like it's Mum, the TS-808. But, in a fun twist, you get a mid boost control knob, which really opens up the possibilities. Very cool!

Model: Maxon ST-01 Super Tube Screamer 
Made: Japan, 1986 approx
Serial: N/A
Type: overdrive
Power Input: standard 9v DC centre-negative (supply not included)
Accessories: none

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)