Figure 2: 12AU7 Tube / IRF612 Mosfet Headphone Amp Schematic
Table 1: Parts List - 12AU7 / IRF612 Headphone Amp
| QTY | LABEL | VALUE |
|---|---|---|
| 2 2 2 2 2 2 2 2 2 2 2 1 2 1 1 1 | P1 C1 C5 R1 C2 R5 R4 R3 C4 R2 R6 VT1 T1 -- -- -- | 100k 100nF 100nF 1M 1uF 20ohm 5W 200 ohm 2W 220k 2W 470uF 50V 47k 5k 2W 12AU7 / ECC82 IRF612 LED Holder LED 9-pin Tube Socket |
Additional Notes - Parts List:
* Heatsink must dissipate around 3W so 2.5-3 square inches, or less if you use a fan. Use heatsink paste and mica insulators as well as insulated washer. The tab of the Mosfet is at (12-13vdc)
* Chassis of your choice, plan for ventilation. * 13VDC switching power supply, can be between 12 and 13 volts to heat the filaments. Power jack is a generic DC jack from Radio Shack.
* The MOSFET (T1) can be replaced by an IRF510, IRF610 or IRF611.
