Parts · Transistors
AC128
Ge PNP BJT TO-1 TH.35 circuits use this part. Listed as: Germanium transistor, PNP; PNP Germanium Transistor; Semiconductors; Trans-Can-WIDE; Transistor.
Datasheet · archived copy from Valvo; the part is discontinued and the maker no longer publishes it
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 |
|---|---|---|---|---|---|
| AC128 | 45 | 16 V | 1000 mA | 1 W | 1 MHz |
Used on other boards here
| Part | hFE min | Vce | Ic | Pc | fT | Boards |
|---|---|---|---|---|---|---|
| GT402B | 60 | 25 V | 500 mA | 0.6 W | 1 MHz | 2 |
| NTE158 | 90 | 32 V | 1000 mA | 1.6 W | 1.5 MHz | 1 |
Closest by the numbers
| Part | hFE min | Vce | Ic | Pc | fT |
|---|---|---|---|---|---|
| AC153 | 50 | 18 V | 2000 mA | 1 W | 1 MHz |
| AC139 | 40 | 20 V | 1200 mA | 0.72 W | 1 MHz |
| AC142 | 40 | 20 V | 1200 mA | 0.72 W | 1 MHz |
| AC180K | 50 | 16 V | 1500 mA | 2.5 W | 1 MHz |
| AC174 | 40 | 16 V | 600 mA | 0.6 W | 0.75 MHz |
| AC117 | 40 | 18 V | 1000 mA | 1 W | 0.5 MHz |
| 2N673 | 40 | 25 V | 2000 mA | 1 W | 0.5 MHz |
| ACY23V | 50 | 30 V | 500 mA | 0.9 W | 0.5 MHz |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Eva 2N2222A · 2N3700 · 2N5088 · AC128 Spaceman Effects Gemini IV · 1590BBS | Spaceman Effects Gemini IV | Fuzz | Dead End FX | 1590BBS | 6 | $15.00 | 76 | |
| Fuzzimile 2N2222 · 2N2222A · 2N3700 · 2N5088 Spaceman Effects Gemini III · 1590BBS | Spaceman Effects Gemini III | Fuzz | Dead End FX | 1590BBS | 3 | $15.00 | 66 | |
| Screaming Life 2N2907A · AC128 · MPSA18 · TC1044 JHS Bunrunner · 1590BBS | JHS Bunrunner | Fuzz | Dead End FX | 1590BBS | 5 | $15.00 | 51 | |
| Talk-A-Lizer AC128 · CA3080 · TL074 | — | Wah / Envelope | Dead End FX | — | 5 | $15.00 | 51 | |
| DAM TB-00 Vero10×10 Verified AC128 DAM TB-00 | DAM TB-00 | Fuzz | Dirtbox Layouts | — | 2 | — | 13 | |
| Spaceman Effects Gemini III Vero23×25 Verified 2N2222A · 2N3700 · 2N5088 · AC128 Spaceman Effects Gemini III | Spaceman Effects Gemini III | Fuzz | Dirtbox Layouts | — | 3 | — | 47 | |
| Spaceman Effects Gemini IV Vero26×25 Unverified 2N2222A · 2N5088 · AC128 · AC176 Spaceman Effects Gemini IV | Spaceman Effects Gemini IV | Fuzz | Dirtbox Layouts | — | 6 | — | 46 | |
| Tortenmann TA-100 Vero19×14 Verified AC128 Tortenmann TA-100 | Tortenmann TA-100 | Overdrive | Dirtbox Layouts | — | 3 | — | 29 | |
| Zvex Fuzz Factory Vero14×8 Verified 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Dirtbox Layouts | — | 5 | — | 17 | |
| Earthquaker Devices Crimson Drive (2-knob version) Perfboard Verified AC128 · J201 EarthQuaker Devices Crimson Drive (2-knob version) | EarthQuaker Devices Crimson Drive (2-knob version) | Overdrive | Effects Layouts (blog) | — | 2 | — | 21 | |
| Spaceman Effects Gemini III Dual Fuzz Generator Perfboard Verified 2N2222A · AC128 · AC176 Spaceman Effects Gemini III · 125B | Spaceman Effects Gemini III | Fuzz | Effects Layouts (blog) | 125B | 3 | — | 47 | |
| Tortenmann TA-100 Perfboard Verified AC128 Tortenmann TA-100 | Tortenmann TA-100 | Overdrive | Effects Layouts (blog) | — | 3 | — | 29 | |
| ZVex Fuzz Factory Perfboard Verified 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Effects Layouts (blog) | — | 5 | — | 17 | |
| Fuzzface AC128 | — | Fuzz | Experimentalists Anonymous | — | — | — | 11 | |
| Roger Mayer Classic Fuzz AC128 | — | Fuzz | Experimentalists Anonymous | — | — | — | 12 | |
| Hybrid Germanium Fuzz 2N3904 · AC128 1590B | — | Fuzz | Five Cats Pedals | 1590B | 5 | £4.50 | 19 | |
| Octo Factory 2N3904 · AC128 Z.Vex Fuzz Factory · 1590BB | Z.Vex Fuzz Factory | Fuzz | Fuzz Dog | 1590BB | 8 | £45.60 | 26 | |
| Fuzz Face AC128 Dallas Arbiter Fuzz Face | Dallas Arbiter Fuzz Face | Fuzz | Guitar-Electronics.eu | — | 2 | €4.88 | 13 | |
| E.S.V. Fuzz (germanium) AC128 Dallas Arbiter Fuzz Face | Dallas Arbiter Fuzz Face | Fuzz | Moody Sounds | — | 2 | kr1295.00 | 12 | |
| Heavy Machinery 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Moonn Electronics | — | 5 | €4.50 | 24 | |
| Fuzz Industries 2N3904 · AC128 Z.Vex Fuzz Factory · 125B | Z.Vex Fuzz Factory | Fuzz | OP Electronics | 125B | 3 | €2.00 out | 21 | |
| Fuzz Foundry 2N3904 · AC128 125B | — | Fuzz | PedalPCB | 125B | 5 | $10.00 | 21 | |
| Fuzz Foundry Deluxe 2N3904 · 2N3906 · AC128 125B | — | Fuzz | PedalPCB | 125B | 8 | $12.00 | 35 | |
| ZVex Fuzz Factory Vero 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Revolution Deux | — | 5 | — | 18 | |
| EarthQuaker Devices Crimson Drive Vero14×11 Verified AC128 · J201 EarthQuaker Devices Crimson Drive | EarthQuaker Devices Crimson Drive | Overdrive | Tagboard Effects | — | 2 | — | 19 | |
| HBE Germania Vero20×12 Verified 2N4403 · 7660S · AC128 HBE Germania | HBE Germania | Boost | Tagboard Effects | — | 1 | — | 25 | |
| Madbean Zombii / ZVex Fat Fuzz Factory Vero15×9 Unverified 2N3904 · AC128 Madbean Zombii / ZVex Fat Fuzz Factory | Madbean Zombii / ZVex Fat Fuzz Factory | Fuzz | Tagboard Effects | — | 5 | — | 19 | |
| Orpheum Fuzz Vero12×10 Verified AC128 Orpheum Fuzz | Orpheum Fuzz | Fuzz | Tagboard Effects | — | 2 | — | 11 | |
| PNP Germanium Buffer Tagboard Verified AC128 PNP Germanium Buffer | PNP Germanium Buffer | Utility | Tagboard Effects | — | — | — | 7 | |
| Roger Mayer Classic Fuzz Tagboard Verified AC128 Roger Mayer Classic Fuzz | Roger Mayer Classic Fuzz | Fuzz | Tagboard Effects | — | 3 | — | 11 | |
| Roger Mayer Page 1 Vero19×13 Verified AC128 · BC550C · LM301A · LM301N Roger Mayer Page 1 | Roger Mayer Page 1 | Distortion | Tagboard Effects | — | 3 | — | 24 | |
| Soulsonic FX Fourbanger Vero20×19 Verified 2SK117 · 7660S · AC128 · BS170 SoulSonic FX Fourbanger | SoulSonic FX Fourbanger | Boost | Tagboard Effects | — | 4 | — | 31 | |
| ZVex Fuzz Factory - compact layout Vero13×9 Verified 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Tagboard Effects | — | 5 | — | 17 | |
| ZVex Fuzz Factory - updated 22nd Jan 2011 Turret board Verified 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Tagboard Effects | — | 5 | — | 14 | |
| ZVex Fuzz Factory vero Vero15×10 Verified 2N3904 · AC128 Z.Vex Fuzz Factory | Z.Vex Fuzz Factory | Fuzz | Tagboard Effects | — | 5 | — | 16 |