+The **5f1** circuit is a classic single-ended [Tube Amplifier](/wiki/tube_amplifier) design. Revered for its pure, rich tone at low volumes, it powered the legendary [Fender Champ](/wiki/fender_champ) guitar amplifier, beloved by musicians for practice and recording.
+## See also
+- [Guitar Amp](/wiki/guitar_amp)
+- [Vacuum Tube](/wiki/vacuum_tube)
+- [Single Ended](/wiki/single_ended)