A simple and practical tube amplifier

The production materials are a power transformer and two output transformers from the old tube recorder L-601. Considering the carrying capacity of the power transformer and improving the signal-to-noise ratio, the filament voltage of the two 6N3 tubes is rectified by a transformer with a secondary output of 15V and provided after voltage stabilization by 7812 (two filaments are connected in series, the figure is omitted). The circuit diagram only draws one channel, and the non-polarized capacitors in the figure are all CBB 400V withstand voltage capacitors. The resistors without markings are all 0.5W.

After the installation and inspection, power on. The Edifier S2.1 speakers are much more pleasant to listen to than the original amplifier. The treble is delicate and the bass is mellow. It is less harsh and harsh.