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BUILD NOTES

Silicon transistor substitutions

The original Tight Fuzz used old-stock NEC 2SD1616 silicon transistors for Q1 and Q2. These

transistors are not necessarily unique, and the 2N5088 or any other comparable medium-gain type will

be a close substitute.

You can also use the BC549C, but note the inverted pinout for the European convention, so it will need

to be rotated 180 degrees from the PCB silkscreen.

Germanium transistor substitutions

Q3 is an old-stock AC127 in the original. In the unit we traced, it measured 146 h

and 175μA leakage.

It's likely that any transistor with an h

above ~80 should work about the same, so you probably don't

need to be too rigid about the specs here.

Note that this is an NPN transistor. Germanium NPNs are a bit more obscure than PNP, but usually easy

to find and fairly cheap since the classic fuzz circuits all used PNP types. If you inadvertently use a PNP

here, it will barely pass signal in germanium mode, so be careful of the type!

Odd resistor values

About half the resistor values used in this circuit are high-precision values such as 47.5k or 6.81k. None

of them are critical to the circuit's operation, so if you have a nearby value such as 47k or 6.8k, you can

substitute them with no change in sound. We've included the nearest substitutes in the Notes column of

the parts list.

However, if you're just using the Mouser spreadsheet to order, they're the same price as standard types,

so we recommend just using the original values.

CINDER HYBRID FUZZ