Parts · Transistors

OC140

Ge NPN BJT TH.6 circuits use this part. Listed as: Germanium transistor, NPN TO-1.

Selector table · a row in a maker's catalog, not a full datasheet; the part is discontinued

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
ASY29	30	15 V	200 mA	0.15 W	10 MHz

The database does not list this number. The parameters and matches are those of the ASY29, its closest listed equivalent.

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N1304	40	20 V	300 mA	0.15 W	4 MHz	4
2N1306	60	15 V	300 mA	0.15 W	8 MHz	13
2SD77	40	25 V	100 mA	0.15 W	2 MHz	1
2N388	60	20 V	200 mA	0.15 W	7 MHz	2
AC130	50	15 V	100 mA	0.145 W	2 MHz	2
2N1308	80	15 V	300 mA	0.15 W	12 MHz	24
2N1302	20	25 V	300 mA	0.15 W	1 MHz	6
AC127	50	12 V	500 mA	0.34 W	1.5 MHz	15

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
GT2906	30	15 V	300 mA	0.15 W	6 MHz
2SC85	30	12 V	200 mA	0.1 W	8 MHz
2N1730	30	15 V	300 mA	0.15 W	5 MHz
GT2765	30	20 V	100 mA	0.15 W	6 MHz
2N1996	35	15 V	300 mA	0.15 W	8 MHz
2N635	25	20 V	300 mA	0.15 W	10 MHz
2N636	35	20 V	300 mA	0.15 W	15 MHz
2N1993	30	18 V	300 mA	0.15 W	3 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Colorsound Hybrid Tonebender 2018 Edition Vero18×15 Verified BC109C · CV10440 · OC140 Colorsound Hybrid Tonebender 2018 Edition	Colorsound Hybrid Tonebender 2018 Edition	Fuzz	Dirtbox Layouts	—	3	—	27
DAM Drag n' Fly Vero11×11 Verified BC337 · OC140 DAM Drag'n'Fly	DAM Drag'n'Fly	Fuzz	Dirtbox Layouts	—	3	—	18
Marigold Fuzz BC107 · BC109C · OC140 Sola Sound Yellow Hybrid Tone Bender · 125B	Sola Sound Yellow Hybrid Tone Bender	Fuzz	PedalPCB	125B	3	$10.00	37
DAM Red Rooster OC140 DAM Red Rooster	DAM Red Rooster	Boost	Revolution Deux	—	3	—	12
Blue Plate Special Vero11×8 Verified OC140 Blue Plate Special	Blue Plate Special	Boost	Tagboard Effects	—	1	—	10
Tone Factor Cream Pie Vero9×8 Verified OC140 Tone Factor Cream Pie	Tone Factor Cream Pie	Boost	Tagboard Effects	—	3	—	12