Fender 6G15 Tube Spring Reverb Unit

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The Fender Reverb Unit (6G15) is a vacuum tube, spring reverb-equipped effects unit made by Fender. It was originally introduced in 1961 and discontinued in 1966, replaced by the solid-state model FR1000. Physically, the unit looks like a small amplifier head and since the early 1960s the unit has become synonymous with surf music. A reissue of the original tube reverb was introduced in 1994 and manufactured through 2016.

The unit features three controls: Dwell, Mixer and Tone and includes a 12AT7 tube as a preamplifier; a 6K6 tube as the reverb driver; and a 12AX7 as the reverb recovery tube. The rectifier is a diode-type solid state unit. The circuit board, like Fender's Brownface, Blackface and Silverface amplifiers is an eyelet board and the unit its completely hand wired. The spring reverb “tank” is mounted on the interior side of the front baffle in vertical position. Tanks were supplied by Gibbs and Accutronics in the original version. (Source: Teagle, Sprung: Fender Amps: The First Fifty Years.)