Parts · Transistors

GT404B

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
GT404B	60	25 V	500 mA	0.6 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
NTE103A	63	32 V	1000 mA	0.65 W	2.3 MHz	4
2SD352	100	30 V	1000 mA	0.6 W		2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
AC141H	40	30 V	1200 mA	0.72 W	1 MHz
AC176-01	100	20 V	2000 mA	0.8 W
AC181KL	50	20 V	1000 mA	2.5 W	2 MHz
2N4077	50	20 V	1000 mA	8 W	1 MHz
AC402	25	32 V	1500 mA	0.5 W
SFT186	40	140 V			90 MHz
2N102	10	30 V	1500 mA	1 W	0.4 MHz
2N144	10	30 V	800 mA	1 W	0.2 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Splinter 1T308B · GT404B 125B	—	Fuzz	Dead End FX	125B	3	$12.00	20