When the volume knob is pulled, some signal from the 12AT7 reverb driver is re-routed, resulting in higher gain.
An optional two-button footswitch allowed for gain switching and reverb on/off. The cabinet was finished in black Tolex, with a black control panel and silver grille cloth.
Production of the Champion 600 reissue ceased in 2010 and was reintroduced by Fender in late 2014.
In 1982, in order to combat its decreasing amp sales, which at that time was around 10,000 units per year, Fender hired Paul Rivera (of Rivera Amplifiers) and asked him to help design amplifiers with a modern sound.Even though he did not personally create the new designs his direction of the engineering team, headed by Mark Wentling, resulted in some legendary amps.The current look is the TV-front with two-tone tolex and speaker grille cloth of imitation suede.For a time after Fender's takeover of Gretsch, the same electronics were available with a different look and feel – based on "tweed" Fender amps, despite the branding – as the Gretsch G5222 Electromatic.The 5C1 circuit was extraordinarily simple, using one 6SJ7 pentode in the preamplifier section to provide a single stage of voltage amplification, one 6V6 beam power tetrode in the power amplifier section, a 5Y3 rectifier tube and a single volume knob with no tone controls.
By 1955 Fender started putting its amps in the "Narrow Panel" tweed cabinet with a plastic oxblood color grill cloth, circuits used a 12AX7 dual triode in the preamplifier to provide two stages of voltage amplification, and a single 6V6GT power tube to produce about 5 watts.In 2007, Fender reintroduced the Vibro Champ as the Vibro Champ XD, part of their "Vintage Modified" series.Aesthetically, the XD is based on the Champ from the blackface era.Unlike the Champion 600, which has a strictly all-tube audio signal path, the Vibro Champ XD's tube circuitry is complemented by a digital signal processor (DSP) that functions as a pre-amp by modelling 16 different amplifiers.The effect of the volume, gain and tone control knobs varies according to the selected amp model.Unlike the Champion 600 (all tube circuitry), the Super Champ XD (like the Vibro Champ XD) is a hybrid (tube circuitry complemented with digital modeling and effects).