unresponsive bias control on a tonebender mk 2 circuit

[Electric Warrior]

The Sola Sound Tone Bender Professional MKII (that's what it always was called on the pedal; they never labled them just "Tone Bender MKII"), the early version of the Marshall Supa Fuzz, the Vox Tone Bender Professional MKII, the Rangemaster Fuzz Bug and the Rotosound Fuzz were all made by Sola Sound and share the same circuit. Fuzz Central didn't document the "Vox version" of the MKII with their Vox schematic, they documented a Vox branded unit that had a certain variation of the MKII circuit that can also be found in Sola Sound or Marshall Supa Fuzz branded units.

The MKII went through a number of changes: Early Sola Sound branded ones built on a smaller circuit board don't have the capacitor between input and ground, the 100Ω limiting resistor and 12k resistors instead of 10k were only used in early units, little later they raised the power filter cap value from 25µF to 50 (or 64 in some cases)µF, 0.015µF caps were used for a while instead of the usual 0.01µF ones, but they returned to 0.01µF before they switched from OC75s and S3-1Ts to OC81Ds and changed Q1's base resistor and Q2's collector resistor to 100k. The last of the OC81D units again don't have the cap between input and ground.  
Particular circuit variations weren't meant to certain brands' takes on the circuit. They only indicate certain places in the MKII timeline.

The later, Marshall made Supa Fuzzes are an exception, though: They have a different vero layout (later PCB), OC75s (+ 10k/47k),10µF electrolytics instead of 5µF and no cap between input and ground. This variation is exclusive to Marshall.

BTW, the circuit board on top of Fuzz Centrals MKII page shows a Vox branded unit.   Confusing, eh? The OC81D Tone Bender schematic underneath it even is correct.

The measurements that Stu gave us are from an early Sola Sound branded unit on small circuit board, a late Vox MKII and an even later Rotosound unit. So yes, voltages were in the same ballpark all the way through.
Getting Q3's collector voltage down to -4,5V will make it sound overly thin and buzzy, anyway.