Parts · Transistors

AC125

Ge PNP BJT TO-1 TH.1 circuit uses this part.

Substitutes Ge PNP 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
AC125	50	12 V	100 mA	0.5 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1
AC128	45	16 V	1000 mA	1 W	1 MHz	35
GT402B	60	25 V	500 mA	0.6 W	1 MHz	2
OC79	50	13 V	300 mA	0.55 W	0.2 MHz	2
2G381	75	20 V	500 mA	0.25 W	1 MHz	5
AC151	30	24 V	200 mA	0.9 W	1 MHz	2
NTE158	90	32 V	1000 mA	1.6 W	1.5 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
OC81	50	10 V	200 mA	0.6 W	1 MHz
2N2428	50	12 V	100 mA	0.5 W	1.3 MHz
AC180	50	16 V	1500 mA	0.3 W	1 MHz
AC184	50	16 V	500 mA	0.25 W	1 MHz
AC153	50	18 V	2000 mA	1 W	1 MHz
ACY20	50	20 V	500 mA	0.26 W	1 MHz
GTC609B	50	50 V	700 mA	0.5 W
NKT261	50	12 V	500 mA	0.3 W	0.5 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Foxrox CC Hybrid Vero17×11 Verified 7660S · AC125 · PN200 Foxrox CC Hybrid	Foxrox CC Hybrid	Fuzz	Tagboard Effects	—	3	—	23