The Stratus Classic Overdrive is a recreation of the Ibanez TS-9 Tube Screamer, first released in 1979 as the OD-808 Overdrive by Maxon and then later licensed to Ibanez.
Originally designed to compete with the Boss OD-1 Overdrive, the TS-808 and TS-9 added the now-famous tone control, but are otherwise very similar to the OD-1 with regards to the feedback diode-clipping arrangement.
The Tube Screamer is one of the most popular DIY effects, and it serves as the source circuit for a number of boutique effects including the Landgraff Dynamic Overdrive, the Fulltone® Fulldrive, and the Lovepedal Eternity.
The new 125B version of the Stratus has been completely overhauled, reducing some flexibility in favor of an easier and more straightforward build. The previous version of the Stratus will remain available.