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The Electro-Voice A20C is a vintage 20-watt mono high-fidelity integrated tube amplifier introduced around 1956, famous for utilizing Electro-Voice's patented Circlotron (push-pull parallel) output circuit topology. This is ONLY ONE MONOBLOCK for sale. It has been fully restored with no part modifications or tweaks and is completely ready for use.Key Specifications & FeaturesOutput Power: 20 watts rated (higher peak capability).Circuit Design: Uses the Wiggins Circlotron design which removes direct current (DC) from the output transformer, enabling class-A/B operation, lower distortion, and cooler running tubes.Tube Complement (typical for A20/A20C variants): Includes vacuum tubes such as 12AX7, 12BH7, 6V6GT, and rectifier/driver tubes like 5Y3GT.Inputs & Controls: Features multi-source inputs (phono with multiple equalization curves, microphone, tape, tuner/TV) along with tone controls, a brilliance control, and a variable damping control.
Electro-Voice’s mid-century gear has real enthusiast appeal, but the A20C’s identity is unclear here: available records point to an A20C Circlotron amplifier rather than a tuner. At US$600, the price is close to the US$642 median for 75 comparable listings—fair if the model and category are confirmed, but not a bargain. It sits well above the US$246 25th percentile and below the US$1,367 75th percentile.
The worthwhile angle is its rarity and period EV engineering, especially for a collector restoring a matching 1950s system. Before buying, verify the chassis plate, tube complement, and whether it is actually a tuner; the title may be mistaken or incomplete. Ask for powered-up operating evidence, clear underside photographs, and confirmation of original transformers and controls. If it proves to be the sought-after amplifier rather than a tuner, US$600 could be quite reasonable; without that verification, the listing is difficult to benchmark confidently.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
# Electro-Voice
Electro-Voice was founded in 1927 by Al Kahn and Lou Burroughs in South Bend, Indiana, initially as Radio Engineers before incorporating under its now-iconic name in 1930. The company's name originated from Notre Dame football coach Knute Rockne, who dubbed an early public address system his "electric voice"—a system designed to help him communicate across multiple practice fields. This humble basement startup evolved into a cornerstone of American audio engineering, relocating to Buchanan, Michigan in 1946 to expand its manufacturing and research capabilities.
The brand built its reputation primarily on professional audio equipment, particularly microphones, loudspeakers, and horn drivers. Electro-Voice pioneered numerous innovations including the hum-bucking coil for microphones, the Compound Diffraction Horn, stereo magnetic phono cartridges, and constant-directivity horn technology. From the 1940s through the 1970s, EV stood alongside industry titans like Altec Lansing, JBL, and Klipsch, with systems widely deployed in cinemas, concert halls, and broadcast facilities.
Today, Electro-Voice occupies a unique position straddling professional audio and high-end consumer markets. The brand is respected among both vintage audio collectors and contemporary sound engineers for its engineering rigor, high-efficiency designs, and naturally dynamic sound character. While primarily known for pro audio applications, EV's historical consumer loudspeaker lines and continued innovation maintain its relevance among discerning audiophiles seeking honest, efficient reproduction over marketing-driven aesthetics.
See all Electro Voice listings on RADAR.
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