A Solar Powered Amplifier of Exceptional Sound Quality

Yesterday 10 years old Ionas was given the task to design the box of the class A single ended audio power amplifier. To surprise he drew on his ipad a blue solar panel on top of the box and a the sun above! Today last posts (grounded collector or emiter follower) were taken over from daybefore yesterday and yesterday where CC was changed to common emitter. Sound was louder, Rs=20Kohm, Ia=100mA. An output 10:1 transformer on a ferrite toroid was placed between 4ohm speker and transistor collector in order to improve efficience. At same Vb=8V it was a surprise to find optimum IC to be just 10mA! Loudeness was a bit higher, sound very smooth with amazing detail on treble, oercussion, female or male 60's Italian voice. Class A operation can sound so nice and smooth our sence opens up. Little power output is needed to make the miracle. Solar powering is possible with a small panel when impedance matching is used for max power transfer. More experimemts needed for a step down ratio of less than 10 to 1 for the @N3055. Would 10 to 1 be optimum for BC550? What would optimum be for BD438?