Parts · Transistors

ACY41

Ge PNP BJT TH.5 circuits use 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
ACY41	50	18 V	500 mA	0.26 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	12
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1
AC128	45	16 V	1000 mA	1 W	1 MHz	35
2N526	65	30 V	500 mA	0.225 W	1 MHz	1
GT402B	60	25 V	500 mA	0.6 W	1 MHz	2
2G381	75	20 V	500 mA	0.25 W	1 MHz	5
2N527	80	30 V	500 mA	0.225 W	2 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
ACY20	50	20 V	500 mA	0.26 W	1 MHz
AC184	50	16 V	500 mA	0.25 W	1 MHz
AC180	50	16 V	1500 mA	0.3 W	1 MHz
OC81N	50	18 V	500 mA	0.2 W	1 MHz
AC553	50	20 V	300 mA	0.22 W	1 MHz
ACY55	50	15 V	500 mA	0.22 W	1 MHz
AC173	50	24 V	300 mA	0.2 W	1 MHz
ACY17	50	32 V	500 mA	0.26 W	1 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
WEM Pep Box Germanium Vero12×9 Verified ACY41 WEM Pep Box Germanium	WEM Pep Box Germanium	Fuzz	Dirtbox Layouts	—	2	—	16
WEM Pep Box Perfboard Verified ACY41 WEM Pep Box	WEM Pep Box	Fuzz	Effects Layouts (blog)	—	2	—	15
WEM / Rush Pep Box (germanium version) Vero ACY41 WEM Pep Box Germanium	WEM Pep Box Germanium	Fuzz	Revolution Deux	—	2	—	14
WEM Pepbox Vero16×7 Verified ACY41 WEM Pep Box	WEM Pep Box	Fuzz	Tagboard Effects	—	2	—	12
WEM Rush Pepbox Vero ACY41 WEM Rush Pepbox	WEM Rush Pepbox	Fuzz	turretboard.org	—	2	—	13