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dg-a

The dg-a (darling geranium class-a) amplifier was an early design.  It was partially intended to see if germanium could sound better than silicon transistors, but it made for a good project anyway as germanium transistors are harder to work with.

Not the best looker, but just a £100 budget. 

It features: 
Simple double darlington pair germanium single ended class-a design
Negative rail supply with PNP only germaniums (germanium prefers P doping)
A power supply that no longer exists after a small explosion, but a couple of car batteries are a good replacement as it is very susceptible to mains hum.