Parts · Transistors

1T308A

Ge PNP BJT TH.8 circuits use this part. Listed as: BJT transistor, PNP (Germanium); Germanium transistor, PNP TO-5.

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
GT308A	20	12 V	150 mA	0.15 W	90 MHz

The database does not list this number. The parameters and matches are those of the GT308A, its closest listed equivalent.

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MA287	30	10 V	200 mA	0.175 W		1
MP40	20	15 V	150 mA	0.15 W	1 MHz	1
MP39B	20	15 V	150 mA	0.15 W	0.5 MHz	5
2N1307	60	15 V	300 mA	0.15 W	8 MHz	6
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	13
GT402D	30	25 V	500 mA	0.6 W	1 MHz	2
AC151	30	24 V	200 mA	0.9 W	1 MHz	2
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N782	20	12 V	200 mA	0.15 W	60 MHz
2N1450	20	20 V	100 mA	0.12 W
2N781	20	15 V	200 mA	0.15 W	60 MHz
2N1961	20	12 V	200 mA	0.15 W	200 MHz
2N680	18	20 V	100 mA	0.15 W
2N3443	20	15 V	100 mA	0.3 W	75 MHz
2N2799	20	15 V	100 mA	0.075 W	120 MHz
2N963	20	12 V	100 mA	0.15 W	250 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Catalinbread Karma Suture Perfboard Verified 1T308A · 2N2222A Catalinbread Karma Suture	Catalinbread Karma Suture	Fuzz	Effects Layouts (blog)	—	4	—	23
Kismet Stitch - 4-knob Harmonic Percolator 1T308A · PN2222A Catalinbread Karma Suture · 1590B	Catalinbread Karma Suture	Distortion	Fuzz Dog	1590B	4	£43.20	27
Karma Sutra 1T308A · BC550B Catalinbread Karma Suture · 125B	Catalinbread Karma Suture	Fuzz	PCB Guitar Mania	125B	4	€9.90 out	27
Antichthon 1T308A · 2N2222 Catalinbread Antichthon	Catalinbread Antichthon	Other	PCBWay: Glory to Ukraine	—	4	—	27
Karma Suture 1T308A · 2N2222 Catalinbread Karma Suture	Catalinbread Karma Suture	Other	PCBWay: Glory to Ukraine	—	4	—	27
Antithesis Fuzz 1T308A · 2N5401 · PN2222A Catalinbread Karma Suture · 125B	Catalinbread Karma Suture	Fuzz	PedalPCB	125B	4	$8.00	35
Special Porpoise Fuzz 1T308A · PN2222A Catalinbread Antichthon · 125B	Catalinbread Antichthon	Fuzz	PedalPCB	125B	4	$12.00	28
Catalinbread Karma Suture Vero13×13 Verified 1T308A · 2N2222A Catalinbread Karma Suture	Catalinbread Karma Suture	Fuzz	Tagboard Effects	—	4	—	24