The small amplifier presented, with excellent sound quality, provides an output of 2 W. Two of them form a stereo two watts per channel system. The source is already sized to power two channels.
The circuit has as critical elements in addition to valves, transformers. The power transformer must have two low-voltage winings and a high voltage to the anodes of the valves. (+B).
The output transformer has a high impedance primary according to the valve (6BM8) and secondary according to the speaker. The primary in the case is 5.6 k Ω.
The circuit includes an input switching key that enables the exchange of channels and mono operation.
A tone of simple circuit with a pot and a 250-pF capacitor are included. Short connections to the signs are important to prevent any noise. In figure 1 the full diagram of this amplifier.
