Using a DSA to analyze the Behringer Super Fuzz

[aparks517]

The write-up I did about measuring the Tube Screamer with a dynamic signal analyzer seemed to go over pretty well here, so I thought I'd share my latest victim... er... subject... the Behringer Super Fuzz. Three separate modes made comprehensive measurements a little tedious , but I got through it and I think I found some interesting stuff for my troubles  . At the suggestion of one of my new Internet friends, I'm now armed with an Instrument BASIC program for summing up harmonic distortion separately for even- and odd-order harmonics, which turned out to be handy for this pedal. All the gory details are in the write-up at https://heartfx.net/sf300.html

I was reading through the documentation for the correlation option on the DSA and I think I could do some interesting measurements on time-based effects too. Is that something you'd be interested in?

[teemuk]

Good analysis. The unit is reputedly clone of Boss FZ-2 Hyper Fuzz, which totally explains some of your observations:
- Distortion circuit is archetypal "phase split" octaver plus clipping diodes circuit, thus abundance of strong second and even order harmonic content
- Both fuzz modes share the same distortion stage and simply employ different post distortion emphasis
- Boost feature simply bypasses the distortion stage and post emphasis
- Bass control is resonant, treble control shelving type with "traditional" Boss distortion effect voicing resembling that of poorly damped amplifier driving a speaker load. (Bass control and its range corresponding resonant frequency and treble control corresponding increasing inductance at higher frequencies).

[aparks517]

Thank you for the kind words 

You're right, that matches up quite neatly. Very interesting, particularly the reasoning behind the bass and treble controls!

Good analysis. The unit is reputedly clone of Boss FZ-2 Hyper Fuzz, which totally explains some of your observations:
- Distortion circuit is archetypal "phase split" octaver plus clipping diodes circuit, thus abundance of strong second and even order harmonic content
- Both fuzz modes share the same distortion stage and simply employ different post distortion emphasis
- Boost feature simply bypasses the distortion stage and post emphasis
- Bass control is resonant, treble control shelving type with "traditional" Boss distortion effect voicing resembling that of poorly damped amplifier driving a speaker load. (Bass control and its range corresponding resonant frequency and treble control corresponding increasing inductance at higher frequencies).