Parts · Transistors

2SB173

Ge PNP BJT TH.2 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
2SB173	40		100 mA	0.125 W	0.7 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2
MA287	30	10 V	200 mA	0.175 W		1
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	12
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	13
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
AC114	40	16 V	80 mA	0.11 W
2SAB32	40	20 V	50 mA	0.15 W	0.8 MHz
AC250	40	32 V	125 mA	0.125 W	1 MHz
AC122	40	18 V	200 mA	0.13 W	1 MHz
2SAB43	40	20 V	50 mA	0.15 W	1 MHz
2SAB43A	40	30 V	150 mA	0.15 W	1 MHz
2N138	44	12 V	150 mA	0.15 W
2N1192	40	25 V	200 mA	0.2 W	1 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Sekova FA-II Fuzz Vero15×12 Verified 2SB173 Sekova FA-II Fuzz	Sekova FA-II Fuzz	Fuzz	Dirtbox Layouts	—	2	—	19
	Sekova FA-II Fuzz Vero20×10 Verified 2SB173 Sekova FA-II Fuzz	Sekova FA-II Fuzz	Fuzz	Tagboard Effects	—	2	—	18