Parts · Transistors
AC187
Ge NPN BJT TO-1 TH.7 circuits use this part.
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 |
|---|---|---|---|---|---|
| AC187 | 100 | 15 V | 2000 mA | 0.225 W | 1 MHz |
Used on other boards here
| Part | hFE min | Vce | Ic | Pc | fT | Boards |
|---|---|---|---|---|---|---|
| 2SD352 | 100 | 30 V | 1000 mA | 0.6 W | 2 | |
| AC176 | 52 | 20 V | 1000 mA | 0.22 W | 1 MHz | 20 |
| NTE103A | 63 | 32 V | 1000 mA | 0.65 W | 2.3 MHz | 4 |
Closest by the numbers
| Part | hFE min | Vce | Ic | Pc | fT |
|---|---|---|---|---|---|
| AC194 | 90 | 15 V | 1000 mA | 1 W | 1 MHz |
| NKT782 | 165 | 12 V | 1000 mA | 0.3 W | 0.5 MHz |
| NKT781 | 52 | 20 V | 1000 mA | 0.215 W | 0.5 MHz |
| AC181 | 50 | 16 V | 1000 mA | 0.3 W | 2 MHz |
| AC558 | 40 | 16 V | 1000 mA | 0.23 W | 1 MHz |
| AC175 | 60 | 16 V | 1000 mA | 1.1 W | 0.5 MHz |
| AC141 | 40 | 18 V | 1200 mA | 0.72 W | 1 MHz |
| 2N1000 | 40 | 25 V | 0.15 W | 6 MHz |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Keeley Fuzz Head Vero19×14 Verified AC187 · MPSA18 Keeley Fuzz Head | Keeley Fuzz Head | Fuzz | Dirtbox Layouts | — | 4 | — | 30 | |
| Buttercup Fuzz Perfboard Verified AC187 J. D. Barbato Buttercup Fuzz | J. D. Barbato Buttercup Fuzz | Fuzz | Effects Layouts (blog) | — | 4 | — | 21 | |
| Keeley Fuzz Head Perfboard Verified AC187 · MPSA18 Keeley Fuzz Head | Keeley Fuzz Head | Fuzz | Effects Layouts (blog) | — | 4 | — | 28 | |
| Keeley Psi Fuzz Perfboard Verified AC187 · TL074 Keeley Psi Fuzz | Keeley Psi Fuzz | Fuzz | Effects Layouts (blog) | — | 3 | — | 35 | |
| Kinetic Fuzz AC187 · TL072 Keeley Psi Fuzz · 125B | Keeley Psi Fuzz | Fuzz | PedalPCB | 125B | 3 | $8.00 | 43 | |
| J. D. Barbato Buttercup Fuzz Vero19×11 Verified AC187 J. D. Barbato Buttercup Fuzz | J. D. Barbato Buttercup Fuzz | Fuzz | Tagboard Effects | — | 4 | — | 19 | |
| Keeley PSI Vero19×18 Verified AC187 · TL074 Keeley Psi Fuzz | Keeley Psi Fuzz | Fuzz | Tagboard Effects | — | 3 | — | 33 |