Saturday, November 21, 2020

Fuzz Machine: Unbranded Ibanez Standard Fuzz

The Fuzz Machine is clearly an unbranded Ibanez No 59 Standard Fuzz.

I occasionally buy a few parts from a retired guy with a shed full of vintage electronics and components, mostly valves and radio gear.  A while back, he mentioned that there were a couple of pedals buried somewhere in the shed.  

I was picking up some transistors from him today, and he'd managed to track the pedals down.  He was kind enough to let me have a look at it, to test before he sells - he wanted to make sure it worked first and wasn't happy with a bench test. 


FUZZ MACHINE  (AKA IBANEZ STANDARD FUZZ)

I took the opportunity to open it up and record voltages and scope results for future use, as I have been meaning to make the Ibanez Standard Fuzz for a while but have not got around to it yet.  

Apart from a few small cobwebs, it's spotless inside, the battery compartment is in good shape, and the faders feel fine for their age. 

And it sounds pretty much as expected...   it does what it says on the box.   Reassuringly, it sounds a lot like the Super Fuzzes that I've made.  Always good to get a side-by-side comparison - I only wish mine looked half as cool as this.  

Fuzz Machine - Ibanez Standard Fuzz pedal


Fuzz Machine - Ibanez Standard Fuzz pedal



Fuzz Machine - Ibanez Standard Fuzz pedal - guts

Fuzz Machine - Ibanez Standard Fuzz pedal - circuit board

Fuzz Machine - Ibanez Standard Fuzz pedal - circuit board

Fuzz Machine - Ibanez Standard Fuzz pedal - circuit board




WHAT DOES THE FUZZ MACHINE LOOK LIKE ON THE SCOPE ?

Signal:  Sine wave, 440hz, approx 130mv
Fuzz & volume on 100%
Battery 8.95v

Notch filter on
Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT



Notch filter off

Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT



First Stage, SK30 JFET

Drain        6.0v
Source     0.88v

Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT



Second Stage, C828 splitter, collector and emitter

Collector    5.0v
Base          4.0v
Emitter       3.5v

Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT

Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT



Third stage, C828, long tail pair collectors

Collector    4.0v
Base          1.1v
Emitter       0.5v

Fuzz Machine - Ibanez Standard Fuzz pedal - SCOPE / FFT



Last stage, C828

Collector    6.4v
Base          0.88v
Emitter       0.28v


Diodes
1N60 Germanium
Forward voltage 0.37v

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