Parts · Transistors

GT309B

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
GT309B	60	10 V	10 mA	0.075 W	120 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
P416A	60	12 V	25 mA	0.1 W	60 MHz	1
GT308B	50	11 V	150 mA	0.15 W	120 MHz	1
MA287	30	10 V	200 mA	0.175 W		1
OC42	70	15 V	50 mA	0.05 W	7 MHz	1
2N408	65	18 V	70 mA	0.15 W	6.7 MHz	5
OC44	100	12 V	10 mA	0.083 W	8 MHz	19
OC46	80	20 V	125 mA	0.083 W	2 MHz	1
2G374	60	25 V	100 mA	0.15 W	1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
SFT174	60	20 V	25 mA	0.1 W	125 MHz
2N311	50	15 V	50 mA	0.075 W
2N1727	50	12 V	50 mA	0.06 W	100 MHz
NKT674F	60	12 V	10 mA	0.08 W	40 MHz
NKT677F	60	12 V	10 mA	0.08 W	40 MHz
2N984	50	10 V	100 mA	0.06 W	175 MHz
NKT656	60	12 V	10 mA	0.065 W	40 MHz
NKT657	60	12 V	10 mA	0.065 W	40 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Smallsound / Bigsound Team Awesome Fuzz Machine V2 Vero28×23 Unverified 2N4401 · 2N5088 · 2N5457 · GT309B Smallsound / Bigsound Team Awesome Fuzz Machine V2	Smallsound / Bigsound Team Awesome Fuzz Machine V2	Fuzz	Dirtbox Layouts	—	5	—	44
	Electric Talons GT115D · GT309B · LT1054 · LT1054CP Baldwin-Burns Buzzaround	Baldwin-Burns Buzzaround	Fuzz	Naegele Audio	—	4	—	29