Parts · Transistors

2SA666

Si PNP BJT.3 circuits use this part.

Substitutes Si 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
2SA666	120	25 V	50 mA	0.25 W	70 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC559	125	25 V	200 mA	0.3 W	75 MHz	4
BC309	125	20 V	100 mA	0.3 W	100 MHz	3
2SA1015Y	120	50 V	150 mA	0.4 W	80 MHz	4
BC557A	125	45 V	100 mA	0.5 W	75 MHz	2
2N4058	100	30 V	30 mA	0.36 W		8
BC187	100	25 V	100 mA	0.3 W	50 MHz	1
2N4288	100	25 V	100 mA	0.25 W	40 MHz	2
2N4126	120	25 V	200 mA	0.31 W	250 MHz	5

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC418A	125	25 V	100 mA	0.25 W	75 MHz
2SA562Y	120	30 V	400 mA	0.3 W	70 MHz
BC252A	120	25 V	100 mA	0.3 W	80 MHz
BC253A	120	25 V	100 mA	0.3 W	80 MHz
2SA1059	120	20 V	30 mA	0.3 W
BC275A	125	25 V	100 mA	0.3 W	65 MHz
BC586	120	20 V	100 mA	0.35 W
BC419	125	20 V	100 mA	0.25 W	75 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Dan Armstrong Green Ringer 2SA666 · 2SC828 · ?	—	Fuzz	Experimentalists Anonymous	—	—	—	15
Green Ringer 2SA666 · 2SC828 · ?	—	Fuzz	Experimentalists Anonymous	—	—	—	14
Mu-tron Phaser 2 2SA666 · 2SC1452 · 2SC828 · 4558 Mu-Tron Phaser 2	Mu-Tron Phaser 2	Phaser	Experimentalists Anonymous	—	3	—	58