Parts · Transistors

MP39B

Ge PNP BJT TH.4 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
MP39B	20	15 V	150 mA	0.15 W	0.5 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MP40	20	15 V	150 mA	0.15 W	1 MHz	1
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	13
GT402D	30	25 V	500 mA	0.6 W	1 MHz	2
OC76	30	32 V	125 mA	0.125 W	0.1 MHz	9
AC151	30	24 V	200 mA	0.9 W	1 MHz	2
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	12
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N1450	20	20 V	100 mA	0.12 W
2N680	18	20 V	100 mA	0.15 W
2N273	20	30 V	100 mA	0.15 W	0.4 MHz
2N1191	20	25 V	200 mA	0.2 W	0.6 MHz
ACY27	20	20 V	200 mA	0.2 W	0.8 MHz
2N1303	20	25 V	300 mA	0.15 W	1 MHz
2N1451	20	20 V	400 mA	0.2 W	1 MHz
AC524	20	30 V	500 mA	0.15 W	1 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
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
Dunlop JBF-3 Joe Bonamassa Fuzz Face Vero11×8 Verified GT308B · MP39B Dallas Arbiter Fuzz Face	Dallas Arbiter Fuzz Face	Fuzz	Tagboard Effects	—	2	—	15
Dunlop JBF-3 Joe Bonamassa Fuzz Face Perfboard IT308B · MP39B Dallas Arbiter Fuzz Face	Dallas Arbiter Fuzz Face	Fuzz	turretboard.org	—	2	—	10