50 Watt 4 Stage Hi-Fidelity Power Amplifier Circuit and Parts List [The Basic Schematic of Most Low Cost Tube Guitar Amps Made Today]

5R4 GYB Tube

Click here to view of the schematic for an RCA designed 50 Watt 4 Stage HiFi Power AB Amplifier

Click here to view a complete copy of the RCA Receiving Tube RC-30 Manual – 1975

Click here to learn more about the 5R4 GYB Tube at The Valve Museum

Click here to visit a guitar amplifier building resource site.