Parts · Transistors

MP14B

Ge NPN BJT TH.1 circuit uses this part.

Substitutes Ge NPN 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
MP14B	30	30 V	20 mA	0.15 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MP37B	25	30 V	20 mA	0.15 W	1 MHz	2
MP10B	25	30 V	20 mA	0.15 W	1 MHz	2
2N1302	20	25 V	300 mA	0.15 W	1 MHz	6
2SD77	40	25 V	100 mA	0.15 W	2 MHz	1
103NU71	45	48 V	250 mA	0.125 W	0.7 MHz	3
GT404B	60	25 V	500 mA	0.6 W	1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
AC340	30	24 V	50 mA	0.125 W	1 MHz
2N385	30	25 V	200 mA	0.15 W	2 MHz
AC127Z	25	40 V	500 mA	0.175 W	1 MHz
2SC128	30	25 V	200 mA	0.15 W	3 MHz
AC350	40	32 V	125 mA	0.125 W	1 MHz
2N35A	35	25 V	100 mA	0.15 W	0.4 MHz
AC351	45	32 V	250 mA	0.125 W	1 MHz
NKT717	40	30 V	150 mA	0.15 W	0.5 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Fred Briggs Hummingbird Overdrive De'luxe Vero 2N7000 · 2SK117 · 2SK170 · BS170 Fred Briggs Hummingbird Overdrive Deluxe	Fred Briggs Hummingbird Overdrive Deluxe	Overdrive	Revolution Deux	—	5	—	54