Altec 1592A

Discrete Transistor Voltage Amplifier

This is a nice example of a 3 transistor pre amp arrangement. Q1 is getting shunt feedback via R8 and series feedback via R11.

Q1 and Q2 are the voltage amplifiers, while Q3 is an output buffer.

Discrete Transistor Phase Shift Oscillator (Sine wave output)

This is a nice example of a discrete transistor oscillator. Q12 is a phase shift oscillator which can produce a decent sine wave. The tone is coupled to emitter follower Q11 via C16 where it is buffered and exits via R34.