Nice bit of MKII history on fuzzboxes.org The MKII might be the most popular of the Tone Benders, although personally I’m split between the MKI & MKIII.

There’s also this interesting timeline on the D*AM forum. Not sure who made it, but it’s a handy reference (thanks ClassicFuzz).

Table of Contents

TONE BENDER MKII SCHEMATIC & VALUES

Tone bender MK II component table schematic

TONE BENDER MKII COMPONENT VALUES TABLE

R7

Apparently, this resistor was used to shave a bit of gain off circuits that were prone to making unpleasant noises when Attack was set to full. It’s said that this was only on some short board Solas, and some Marshall Suapfuzzes.

C6

My experience with this circuit is that if you don’t have a cap on the power, it can oscillate/make terrible noises.

TONE BENDER MKII LEAKAGE & HFE

A lot of talk about this – I’m not going to get into absolutes, but keep in mind that these originally used quite leaky transistors, and there are reports of nice sounding ones with very high hfe.

APPROXIMATE VOLTAGE RANGE

As the heading suggests – these are approximate voltages only. Results will vary from unit to unit, and if it sounds good to you, then don’t stress about some numbers.

-4.5 to -5 volts is not what you’re after on Q3 collector – that’s fuzz face territory.

All voltages shown below are negative

C 8.5

B 0.3 to 0.06

E 0.0

C 0.13 to 0.32

B 0.07

E 0.0

C 7.5 to 8.5

B 0.13 to 0.22

E 0.1

From DIY Stompboxes, Electric Warrior

Battery: -9.67V

C -9.02

B -0.03

E 0

C -0.17

B -0.08

E 0

C -8.44

B -0.17

E -0.11

MKII TONE BENDER TUNING TIP

Tuning tips by Dave Main – if you’re using a trimmer in place of the 8k2 resistor.

You can also do it by ear, which is much more fun. Get the MKII running into a clean amp at a reasonable volume. Set the Level full and the Attack totally off. Roll your guitar’s volume control back a wee bit, about 7-8 if you have a Strat. The tone here should be pretty clear and clean, if you can hear some fuzzy artefacts then inch the trimmer over to the left until they disperse. If you then crank the Attack and pull up your guitars volume you’ll also have maximum sustain from the unit, that too should give a little play on any temperature fluctuations.

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Tone Bender MKII – Component Values Table