Parts · Transistors
OC139
Ge NPN BJT TH.16 circuits use this part. Listed as: Germanium transistor, NPN; Transistor OC139.
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 |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Earthquaker Devices Bows Vero13×7 Verified OC139 EarthQuaker Devices Bows | EarthQuaker Devices Bows | Boost | Dirtbox Layouts | — | 1 | — | 12 | |
| Earthquaker Devices Crimson Drive 3-knob Vero16×9 Verified J201 · OC139 EarthQuaker Devices Crimson Drive 3-knob | EarthQuaker Devices Crimson Drive 3-knob | Boost | Dirtbox Layouts | — | 3 | — | 21 | |
| VFE Pedals Fuzz Duo Vero16×16 Unverified BC108 · OC139 VFE Fuzz Duo | VFE Fuzz Duo | Fuzz | Dirtbox Layouts | — | 4 | — | 22 | |
| Beauregard OC139 Dallas Arbiter Rangemaster · 1590A | Dallas Arbiter Rangemaster | Overdrive | Effects Layouts | 1590A | 1 | $4.00 | 14 | |
| EQD Bows Perfboard Verified OC139 EarthQuaker Devices Bows · 1590A | EarthQuaker Devices Bows | Boost | Effects Layouts (blog) | 1590A | 1 | — | 12 | |
| EarthQuaker Devices Crimson Drive (3-knob) Perfboard Verified J201 · OC139 EarthQuaker Devices Crimson Drive 3-knob · 1590B | EarthQuaker Devices Crimson Drive 3-knob | Overdrive | Effects Layouts (blog) | 1590B | 3 | — | 19 | |
| VFE Fuzz Duo Perfboard Verified BC108 · OC139 VFE Fuzz Duo | VFE Fuzz Duo | Fuzz | Effects Layouts (blog) | — | 5 | — | 24 | |
| Crimson Idol Overdrive J112 · OC139 EarthQuaker Devices Crimson Drive · 1590B | EarthQuaker Devices Crimson Drive | Overdrive | HotKits | 1590B | 3 | $2.50 | 19 | |
| Crimson Device J201 · OC139 EarthQuaker Devices Crimson Drive · 125B | EarthQuaker Devices Crimson Drive | Overdrive | PCB Guitar Mania | 125B | 3 | €9.90 out | 25 | |
| Mongol Device OC139 EarthQuaker Devices Bows · 125B | EarthQuaker Devices Bows | Boost | PCB Guitar Mania | 125B | 1 | €8.90 out | 18 | |
| Bows OC139 EarthQuaker Devices Bows | EarthQuaker Devices Bows | Other | PCBWay: Glory to Ukraine | — | 1 | — | 15 | |
| CrimsonDrive (PCB V2) J201 · OC139 EarthQuaker Devices CrimsonDrive (PCB V2) | EarthQuaker Devices CrimsonDrive (PCB V2) | Overdrive | PCBWay: Glory to Ukraine | — | 3 | — | 20 | |
| EQD Crimson Drive J201 · OC139 | — | Overdrive | PCBWay: Glory to Ukraine | — | 3 | — | 22 | |
| Aft Preamp OC139 EarthQuaker Devices Bows · 125B | EarthQuaker Devices Bows | Fuzz | PedalPCB | 125B | 2 | $8.00 | 16 | |
| Carmine Overdrive J201 · OC139 EarthQuaker Devices Crimson Drive · 125B | EarthQuaker Devices Crimson Drive | Fuzz | PedalPCB | 125B | 3 | $8.00 | 26 | |
| VFE Pedals Fuzz Duo Vero16×14 Verified BC108 · OC139 VFE Fuzz Duo | VFE Fuzz Duo | Fuzz | Tagboard Effects | — | 4 | — | 27 |