Here's a quick look at a gut shot from an original Tone Bender MK1.5:
You can see the two Mullard OC75 germanium transistors which are the heart of the circuit. Also note the vero board construction. The tone of this circuit is less saturated than the MKI Tone Bender and produces a tone much similar to the original Arbiter Fuzz Face, and here's why:
Here's a demo video of the Tone Bender MK1.5 circuit in action (Note - this a D*A*M rebuilt circuit):
Here's a great vero layout by Sinner of www.turretboard.org:
OK, so what transistor HFEs work? The standard Fuzz Face values of 80-90Hfe for Q1 and 110-130Hfe for Q2 are fine, but as usually feel free to tune to your own tastes!