Parts · Transistors

AC127

3 circuits use this part. Listed as: Germanium transistor, NPN.

Substitutes Ge NPN transistor

Matched on material, polarity and the limits below from the transistor parameter database. Pinouts and packages are not in that data: check the datasheet before you drop one in, and expect gain to change the sound.

This part

Part	hFE min	Vce	Ic	Pc	fT
AC127	50	12 V	500 mA	0.34 W	1.5 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
AC176	52	20 V	1000 mA	0.22 W	1 MHz	7
GT404B	60	25 V	500 mA	0.6 W	1 MHz	1
AC187	100	15 V	2000 mA	0.225 W	1 MHz	1
2SD352	100	30 V	1000 mA	0.6 W		2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
AC181	50	16 V	1000 mA	0.3 W	2 MHz
AC185	50	16 V	500 mA	0.27 W	2 MHz
SFT377	50	16 V	600 mA	0.25 W	1 MHz
AC186	60	18 V	700 mA	0.215 W	1 MHz
AC558	40	16 V	1000 mA	0.23 W	1 MHz
2N525	44	30 V	500 mA	0.225 W	1 MHz
NKT781	52	20 V	1000 mA	0.215 W	0.5 MHz
2N2430	60	32 V	500 mA	0.25 W	1 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Cinder Hybrid Fuzz 2N5088 · AC127 · TL072	Amptweaker Tight Fuzz	Fuzz	Aion FX	125B	4	$12.50	73
Fusion Fuzz AC127 · BC109C	Hybrid Fuzz Driver	Fuzz	Fuzz Dog	1590B	5	£38.40	32
Cosmopolitan AC127 · BC109 · BS170	Skreddy Screwdriver	Fuzz	Madbean	1590B	5	$10.00	41