I love transistors! I love MOSFETS as well, but BJTs are my favorites. Although I know very good assemlby to use with microcontrollers, i still prefer analog electronics. Maybe because its harder and involves a lot of maths... Maybe because i grew up with transistors... Anyway, here is a single transistor preamplifier with a very good step-by-step explanation from Bobom Patelers. Its such a shame not to make a transistor amplifier! Its the simplest thing to do, and you will learn so many many things through the process of testing and burning!