Parts · Transistors

MA287

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
MA287	30	10 V	200 mA	0.175 W

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	13
OC76	30	32 V	125 mA	0.125 W	0.1 MHz	9
GT402D	30	25 V	500 mA	0.6 W	1 MHz	2
AC151	30	24 V	200 mA	0.9 W	1 MHz	2
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
GT308A	20	12 V	150 mA	0.15 W	90 MHz	2
MP39B	20	15 V	150 mA	0.15 W	0.5 MHz	5
MP40	20	15 V	150 mA	0.15 W	1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
ACY35	30	10 V	200 mA	0.2 W	0.2 MHz
2N291	30	12 V	200 mA	0.18 W	0.2 MHz
2N1171	30	12 V	400 mA	0.17 W	8 MHz
2N1300	30	12 V	100 mA	0.15 W	20 MHz
2N1301	30	12 V	100 mA	0.15 W	30 MHz
2N1347	30	12 V	200 mA	0.15 W	5 MHz
2N450	30	12 V	125 mA	0.15 W	4 MHz
2N794	30	12 V	100 mA	0.15 W	25 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Tone Bender Mk. IV 2N526 · MA287 Sola Sound Tone Bender MKIV · 125B	Sola Sound Tone Bender MKIV	Fuzz	Naegele Audio	125B	3	—	28