Parts · Transistors

GT309

Ge PNP BJT TH.1 circuit uses 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
GT309A	20	10 V	10 mA	0.075 W	120 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
GT308A	20	12 V	150 mA	0.15 W	90 MHz	2
GT313A	20	15 V	30 mA	0.1 W	300 MHz	2
MA287	30	10 V	200 mA	0.175 W		1
MP40	20	15 V	150 mA	0.15 W	1 MHz	1
P416A	60	12 V	25 mA	0.1 W	60 MHz	1
MP16	20	15 V	20 mA	0.2 W	1 MHz	1
MP39B	20	15 V	150 mA	0.15 W	0.5 MHz	5
OC603	20	12 V	50 mA	0.08 W	0.25 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N2799	20	15 V	100 mA	0.075 W	120 MHz
2SA507	20	18 V	5 mA	0.075 W	120 MHz
2N1726	20	12 V	50 mA	0.06 W	100 MHz
2N1500	20	12 V	50 mA	0.06 W	150 MHz
AC530	20	15 V	50 mA	0.125 W
2N1499	20	18 V	50 mA	0.06 W	100 MHz
2N1450	20	20 V	100 mA	0.12 W
2N1646	20	12 V	50 mA	0.15 W	150 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Apocalypse Audio H Fuzz Vero14×11 Verified GT309 Apocalypse Audio H Fuzz	Apocalypse Audio H Fuzz	Fuzz	Dirtbox Layouts	—	4	—	23