SR&D ROCKMAN A12-50 AMP WITH ULTIMATUM DISTORTION GENERATOR This is SERIAL NUMBER #072 of roughly 400 (+/-) units manufactured. This unit is in excellent condition and has recently been refurbished. Closely inspect the pictures and you can see how well maintained and cared for this unit has been during its life. It just doesn’t get any better. Look around and see what others are offering at higher prices WITHOUT the Vintage Rockman Footswitch, Certificate of Refurbishment and a copy of the Original Owner’s Manual. This is the best you can find, hands down! The Rockman A12-50 is a rare, 50-watt solid-state combo amp built by Scholz Research & Development “SR&D” in the early 1990s. Known for its built-in Ultimatum distortion and signature Boston compression, it is highly sought after by collectors. Because around 400 units were produced, they are not always available. The SR&D Rockman A12-50 is a highly sought-after, 50-watt solid-state 1×12 combo amplifier released in 1993 by Tom Scholz’s company, Scholz Research & Development (SR&D). It is a unique piece of Rockman history, serving as the rare exception to the brand’s usual “amp-less” philosophy. Key Specifications & Features Power & Speaker: Delivers 50 watts of solid-state power through a premium 12 Celestion speaker. Design: Unlike the vast majority of Rockman gear which featured slider pots, the A12-50 utilized standard rotary controls for a more traditional amplifier interface. Channel Architecture: It operates as a two-channel amp, Clean and Distortion. The Ultimatum Circuit: The distortion channel features the legendary Ultimatum Distortion circuit-the same complex, multi-stage clipping architecture SR&D later used in their standalone Ultimatum Distortion Generator pedal. This circuit uses two distinct in-series clipping stages (a compressor/clipper and a power-amp saturation simulator) to mimic the heaviest, punchiest tube overdrive. Inputs & Connectivity: Includes a standard 1/4 guitar input and a stereo Aux input designed for external sound sources (like drum machines) that bypasses the amp’s distortion circuitry. Effects Loop: Features built-in Send and Return jacks on the rear panel for integrating external time-based effects like the famous Rockman Stereo Chorus/Delay. Tone & Legacy While it lacks the built-in stereo spatial effects (chorus and echo) typical of other Rockman units, the A12-50 is celebrated for offering one of the best high-gain solid-state tones available. You know how it’s done! It is famously capable of capturing the iconic “Boston” guitar tone directly out of the box, producing a massive, highly compressed, and mid-focused sound that rivals tube competitors.