Sola Sound - Tonebender Mark II Professional - freestompboxes.org
Improving the Sound of MkIII Tone Bender
FOGBOW MKI TONE BENDER – Blackstrap Electrik Co.
Supa Fuzz Marshall Tone Bender VINTAGE KIT Iskra Philips Mustard | eBay
シミュレーションでお勉強:Tone Bender Mk.1は沼にハマる最高傑作なFUZZ回路だった | Project JAZZCASTER - by カバ野郎
Buzz the Fuzz - all about Tone Bender: circuit of Tone Bender MK3 and Buzzaround
Fuzz Central -- Colorsound Tonebender MKII
Fuzz Central -- Vox Tonebender
Fuzz Central -- Colorsound Tonebender 3-knob
Looking for help understanding how to analyze this circuit (Tone Bender MkII) – specifically how to calculate currents and voltages on Q1 and the role of (feedback?) resistor R6. More specific questions