The sound - as well as the circuit - reveals: this is more a Big Muff than a Tone Bender. This particular model, the Jumbo Tone Bender, was available in different designs throughout the years of production. My unit is a very early one from 1976, less colorfull than later versions (see the sample in the Youtube video below).
02/25/2017: ToneHome is looking for an Ibanez CS-505 narrow box first issue with flying fingers side graphic. Any hint is highly appreciated. Other than that we're looking for boxed effects or just boxes for Ibanez narrow box GE-601, AD-80, CP-835, OD-850. Please submit your offers or leads here: e-mail