Parts · Transistors

MP37

Ge NPN BJT TH.2 circuits use 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
MP37	15	15 V	20 mA	0.15 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MP35	13	15 V	20 mA	0.15 W	0.5 MHz	6
2N1302	20	25 V	300 mA	0.15 W	1 MHz	6
MP37B	25	30 V	20 mA	0.15 W	1 MHz	2
MP10B	25	30 V	20 mA	0.15 W	1 MHz	2
MP38	25	15 V	20 mA	0.15 W	2 MHz	3
MP14B	30	30 V	20 mA	0.15 W	1 MHz	1
2N1101	25	15 V	100 mA	0.18 W	0.1 MHz	2
2SD77	40	25 V	100 mA	0.15 W	2 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N233A	15	12 V	100 mA	0.15 W	2 MHz
2N1994	15	15 V	300 mA	0.15 W	3 MHz
2SC89	20	15 V	400 mA	0.12 W	1 MHz
2SC89H	20	15 V	400 mA	0.12 W	1 MHz
2N594	20	20 V	300 mA	0.15 W	1 MHz
2N679	20	20 V	200 mA	0.15 W	1 MHz
2N356	20	18 V	500 mA	0.1 W	1 MHz
AC330	20	24 V	50 mA	0.125 W	1 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Smallsound/Bigsound Sparkle Motion Vero12×10 Verified MP37 Smallsound/Bigsound Sparkle Motion	Smallsound/Bigsound Sparkle Motion	Boost	Dirtbox Layouts	—	3	—	17
	Zzoyds Black Velvet Fuzz Vero15×13 Unverified MP37 · MP38 Zzoyds Black Velvet Fuzz	Zzoyds Black Velvet Fuzz	Fuzz	Dirtbox Layouts	—	4	—	26