Parts · Transistors
OC71
Ge PNP BJT TH.18 circuits use this part. Listed as: Germanium transistor, PNP; BJT transistor, PNP Germanium; Transistor-TO-92 Inline Wide.
Selector table · a row in a maker's catalog, not a full datasheet; the part is discontinued
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 |
|---|---|---|---|---|---|---|
| OC82D | 30 | 16 V | 10 mA | 0.15 W | 0.2 MHz | 1 |
| 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 |
| OC82DM | 30 | 16 V | 10 mA | 0.17 W | 1 MHz | 4 |
| OC81D | 20 | 16 V | 10 mA | 0.15 W | 0.2 MHz | 3 |
| MP39B | 20 | 15 V | 150 mA | 0.15 W | 0.5 MHz | 5 |
| AC151 | 30 | 24 V | 200 mA | 0.9 W | 1 MHz | 2 |
| NKT213 | 50 | 18 V | 250 mA | 0.2 W | 0.5 MHz | 12 |
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 |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Carlsbro 2 Knob Fuzz Box Vero16×11 Verified OC71 Carlsbro 2 Knob Fuzz Box | Carlsbro 2 Knob Fuzz Box | Fuzz | Dirtbox Layouts | — | 2 | — | 18 | |
| Hornby & Skewes Selectatone T.B.2 Vero11×11 Unverified OC71 Hornby Skewes T.B. 2 Selectatone | Hornby Skewes T.B. 2 Selectatone | Boost | Dirtbox Layouts | — | — | — | 11 | |
| Hornby Skewes Zonk Machine Mk. I Si/Ge Hybrid Vero15×10 Verified 2N4061 · OC71 · TIA02618 Hornby Skewes Zonk Machine Mk I | Hornby Skewes Zonk Machine Mk I | Fuzz | Dirtbox Layouts | — | 2 | — | 20 | |
| Hudson Broadcast - dual footswitch version Vero24×21 Verified BC549C · LT1054 · OC71 Hudson Electronics Dual Broadcast | Hudson Electronics Dual Broadcast | Boost | Dirtbox Layouts | — | 4 | — | 30 | |
| Hudson Electronics Broadcast 9v/24v Vero21×13 Verified BC549C · OC71 Hudson Electronics Broadcast | Hudson Electronics Broadcast | Boost | Dirtbox Layouts | — | 3 | — | 26 | |
| Höfner Pre Amp Vero11×9 Verified OC71 Höfner Pre Amp | Höfner Pre Amp | Boost | Dirtbox Layouts | — | 1 | — | 11 | |
| Hudson Electronics Broadcast Perfboard Verified BC549C · LT1054 · OC71 Hudson Electronics Broadcast · 125B | Hudson Electronics Broadcast | Overdrive | Effects Layouts (blog) | 125B | 3 | — | 30 | |
| Dual Transmitter BC549C · LT1054 · OC71 Hudson Electronics Dual Broadcast · 1590BB | Hudson Electronics Dual Broadcast | Preamp / Amp-in-a-box | Five Cats Pedals | 1590BB | 6 | £5.00 | 51 | |
| Podcaster BC549C · LT1054 · OC71 Hudson Electronics Dual Broadcast · 1590BB | Hudson Electronics Dual Broadcast | Fuzz | PCB Guitar Mania | 1590BB | 4 | €11.90 out | 50 | |
| Box 66 OC71 · OC76 · TC1044 · TC1044SCPA D*A*M 1966 · 125B | D*A*M 1966 | Fuzz | PedalPCB | 125B | 4 | $8.00 | 22 | |
| Duocast BC549C · LT1054 · OC71 Hudson Electronics Dual Broadcast · 1590BBM | Hudson Electronics Dual Broadcast | Fuzz | PedalPCB | 1590BBM | 8 | $10.00 | 47 | |
| Simulcast BC549C · LT1054 · OC71 Hudson Electronics Broadcast · 125B | Hudson Electronics Broadcast | Fuzz | PedalPCB | 125B | 4 | $12.00 | 45 | |
| Hornby Skewes Selectatone T.B.2 OC71 Hornby Skewes T.B. 2 Selectatone | Hornby Skewes T.B. 2 Selectatone | Boost | Revolution Deux | — | 1 | — | 14 | |
| Hornby Skewes Zonk Machine (alternate version) A02650 · OC71 Hornby Skewes Zonk Machine | Hornby Skewes Zonk Machine | Fuzz | Revolution Deux | — | 2 | — | 19 | |
| Carlsbro Fuzzbox Vero15×11 Verified OC71 Carlsbro Fuzzbox | Carlsbro Fuzzbox | Fuzz | Tagboard Effects | — | 2 | — | 17 | |
| Hornby Skewes T.B. 2 Selectatone Vero11×9 Verified OC71 Hornby Skewes T.B. 2 Selectatone | Hornby Skewes T.B. 2 Selectatone | Boost | Tagboard Effects | — | 1 | — | 9 | |
| Hudson Electronics Broadcast Vero21×18 Verified BC549C · LT1054 · OC71 Hudson Electronics Broadcast | Hudson Electronics Broadcast | Overdrive | Tagboard Effects | — | 3 | — | 27 | |
| Pro Analog MKIII Fuzz Vero16×9 Verified OC44 · OC71 Pro Analog Mk. III Fuzz | Pro Analog Mk. III Fuzz | Fuzz | Tagboard Effects | — | 2 | — | 19 |