Parts · Transistors

1T308B

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
GT308B	50	11 V	150 mA	0.15 W	120 MHz

The database does not list this number. The parameters and matches are those of the GT308B, its closest listed equivalent.

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MA287	30	10 V	200 mA	0.175 W		1
2N1307	60	15 V	300 mA	0.15 W	8 MHz	6
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1
2N1309	80	15 V	300 mA	0.15 W	12 MHz	1
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
AC125	50	12 V	100 mA	0.5 W	1 MHz	1
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N2048	50	15 V	100 mA	0.15 W	150 MHz
2N828	50	15 V	200 mA	0.15 W	150 MHz
2N1955	50	18 V	200 mA	0.2 W
2N2401	50	10 V	100 mA	0.15 W	200 MHz
2N138	44	12 V	150 mA	0.15 W
2N2942	50	25 V	100 mA	0.15 W	150 MHz
2N2635	45	15 V	100 mA	0.15 W	150 MHz
2N1683	50	12 V	100 mA	0.15 W	40 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Splinter 1T308B · GT404B 125B	—	Fuzz	Dead End FX	125B	3	$12.00	20
	Spaceman Effects Redstone Vero19×17 Verified 1T308B · J201 · LND150N3-G Spaceman Effects Redstone	Spaceman Effects Redstone	Boost	Dirtbox Layouts	—	5	—	27