At your risk. Take all safety precautions. Any voltage or current can be dangerous. Hearing protection is needed.
A one transistor amplifier such as Pleiades BD139 etc can sound very loud (see previous posts)
Has gentle overload like electron tubes or produces harmonics of low order as it is just one transistor.
Has low battery (always use a fuse in series with battery for safety) energy consumption at a rate of only 12V times 50mA.
Phase response would be excellent at such low simplicity.
Is very easy to make.
Frequency response is down to 0Hz as it is direct coupled to speaker or low frequency response adjusted by an output transformer.
A darligton (2 transistor connected together) should be used for much more gain or overload capability. Bias can be from collector to first base. Added advantage is the gate effect of reducing electric guitar noise.
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