F4 100 Watt Tube Amplifier

The F4 is the Phantom’s rebellious sister—built with Diamond DNA but priced for the working musician. Part of the Vanguard Series, it delivers heavy, percussive distortion with modern authority while keeping things accessible. Two channels, a dialable Depth control, and a front-panel “bright” switch give the F4 surprising flexibility, letting you sculpt everything from chest-thumping lows to cutting highs.

With full tone controls on both channels and a master volume to keep it all in check, the F4 is ready for stage or studio. Six 12AX7s and a 5881-powered output stage bring plenty of punch, while Diamond’s no-compromise build ensures the same rugged reliability found across the entire lineup.

Steel grilles, metal knobs, and a green LED glow finish off the look, giving the F4 the same unmistakable attitude as its big brother. Affordable, versatile, and unapologetically Diamond—the F4 proves pro tone doesn’t have to break the bank.