Parts · Transistors

MP42B

Ge PNP BJT TH.3 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
MP42B	45		150 mA	0.2 W	1 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
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2
AC125	50	12 V	100 mA	0.5 W	1 MHz	1
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	12
AC128	45	16 V	1000 mA	1 W	1 MHz	35
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N651	45	45 V	500 mA	0.2 W	1 MHz
2N994	45	6 V	150 mA	0.2 W
2N611	45	15 V	200 mA	0.18 W	1 MHz
2N322	45	18 V	200 mA	0.225 W	1 MHz
ACY29	45	15 V	200 mA	0.2 W	0.9 MHz
AC517	45	20 V	200 mA	0.16 W	1 MHz
AC572	45	40 V	500 mA	0.15 W	1 MHz
AC577	45	40 V	500 mA	0.15 W	1 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Capitalist Death Cult Yukagir Vero20×24 Verified 2N5087 · 2N5089 · 2SK30 · MP42B Capitalist Death Cult Yukagir	Capitalist Death Cult Yukagir	Fuzz	Dirtbox Layouts	—	4	—	41
Kazan Booster 4 transistor version Vero18×16 Verified MP39B · MP42B Kazan Booster 4 transistor version	Kazan Booster 4 transistor version	Fuzz	Dirtbox Layouts	—	2	—	26
Kazan Booster V1 Vero15×14 Verified MP39B · MP42B Kazan Booster V1	Kazan Booster V1	Fuzz	Dirtbox Layouts	—	2	—	20