Parts · Transistors

OC71

5 circuits use this part. Listed as: BJT transistor, PNP Germanium; Germanium transistor, PNP; Transistor-TO-92 Inline Wide.

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
OC71	30	20 V	10 mA	0.125 W	0.3 MHz

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	3
OC76	30	32 V	125 mA	0.125 W	0.1 MHz	1
OC81D	20	16 V	10 mA	0.15 W	0.2 MHz	1
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	1
OC75	55	20 V	10 mA	0.125 W	0.1 MHz	3
MP41A	50	30 V	150 mA	0.15 W	1 MHz	1
NTE102	90	16 V	150 mA	0.15 W	2 MHz	1
2N508	120	16 V	200 mA	0.2 W	2 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N198	30	25 V	30 mA	0.1 W	0.3 MHz
AC540	30	15 V	50 mA	0.15 W
2N1954	30	20 V	200 mA	0.2 W
2N1956	30	16 V	200 mA	0.2 W
2N573	30	25 V	250 mA	0.2 W
OC820	30	20 V	150 mA	0.15 W	0.2 MHz
OC72	30	16 V	125 mA	0.165 W	0.25 MHz
OC73N	30	16 V	10 mA	0.125 W	0.2 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Dual Transmitter BC549C · LT1054 · OC71	Hudson Dual Broadcast	Preamp / Amp-in-a-box	Five Cats Pedals	1590BB	6	£5.00	51
Podcaster BC549C · LT1054 · OC71	Hudson dual Broadcast	Fuzz	PCB Guitar Mania	1590BB	4	€11.90 out	45
Box 66 OC71 · OC76 · TC1044SCPA	DAM 1966	Fuzz	PedalPCB	125B	4	$8.00	22
Duocast BC549C · LT1054 · OC71	Hudson Broadcast (Dual Footswitch)	Fuzz	PedalPCB	1590BBM	8	$10.00	47
Simulcast BC549C · LT1054 · OC71	Hudson Broadcast	Fuzz	PedalPCB	125B	4	$12.00	45