Rivera Chubster 55 with Celestion G12P - 80 speaker.

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Rivera Chubster 55, in perfect condition, recent service with bias done on valves, comes with soft padded cover, footswitch and mains cable. The Rivera Chubster 55 is a 55-watt, all-tube 1x12 boutique guitar combo amplifier known for delivering both Fender-style cleans and Marshall-style overdrive tones. Key Specifications & Features Power Output: 55 watts Power Tubes: Powered by a pair of EL34 tubes (compatible with alternative tubes like 6L6GC via adjustable bias) Preamp Tubes: Five 12AX7 preamp tubes Speaker: 1x12 Celestion speaker Channels: Two fully independent preamp channels with distinct voicings—Channel 1 (British/Overdrive) and Channel 2 (American/Clean) Boosts: Footswitchable boost function for each channel, providing four distinct, easy-to-access sounds Enclosure: Extra-deep, open-back cabinet made of American maple solid-core plywood designed to eliminate boxy tones and enhance low-end resonance Hardware & Dimensions: Weighs approximately 45 lbs, with dimensions around 20.5" x 12" x 17" I/O: Preamp/power amp patch loop (effects loop with send/return level controls on the 55W version), line out, and speaker output Tone & Performance The "Chub" Design: Developed to fix the slightly shallow, boxy sound of older designs like the Rivera R55-112, the deeper cabinet on the Chubster 55 generates a rich, fat low end and plenty of headroom before breakup. Versatility: Users and reviewers on platforms like the Hamer Fan Club Forum generally agree that the amp is built "like a tank" and handles a wide array of genres from jazz and blues to heavy rock. It also takes distortion pedals exceptionally well.