It is very simple and well-known hybrid headphone amplifier using 12V battery as power supply. It is built on one vacuum tube - ECC82 or equivalent and IRF510 Mosfet transistor. Works in class A, and is very easily adjusted to a desired quiescent current.

Specially designed enclosure helps to cool down the components, and do not hide the tube used. With the design it is matched with my previous tube amplifier project.

This head amp is very sensitive to the quality of components. With every change something changes. Have tried many different capacitors, tubes...

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