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Both units workingBeta II:Frequency response: 10Hz to 100kHzTotal harmonic distortion: 0.01%Input sensitivity: 2mV (MM), 150mV (line)Signal to noise ratio: 58dB (MM), 75dB (line)Output: 150mV (line)Gamma 20:Dimensions: 482 x 70 x 330 mm (WxHxD).Weight: 5 kgOriginal price approx.: 380 US-$, 1'160 DMConnectionsNumber of inputs: Antenna FM / MW: 75, 300 Ohm / 300 OhmNumber of outputs: Line Out: 150 mV, 2.2 kOhm.FM Det Out:SpecificationsReception: FM, MWFrequencies: VHF: 88 - 109 MHzMW: 530 - 1600 KHz Input sensitivity: FM: 1.8 µVMW: 350 µVFrequency response: 50 - 15'000 Hz, ± 0,5 dBDistortion factor FM (1 kHz): Mono: < 0.08 %Stereo: < 0.12 % Signal-to-noise ratio: FM mono: 75 dBFM stereo: 68 dB MW: 38 dBChannel separation: 40 dB (1 kHz)selectivity: FM: 70 dBMW: 30 dBCo-wave selection: 1.5 dBSpurious wave selection: 70 dBImage frequency attenuation: FM: 70 dBMW: 30 dBIF attenuation: FM: 80 dBMW: 25 dBAM suppression: 60 dBSpecial FeaturesVHF De-Emphasis switchable
Because this is a late-’70s/early-’80s synthesized tuner, timing matters less for “new tech” value and more for whether it’s been serviced and is still pulling stations cleanly. At US$369, this is above the typical used range I can verify for the model: recent examples show US$70, US$85, US$95, and US$195, with an original price around US$380. That makes the ask feel ambitious rather than a bargain, especially with condition listed as unknown.
What makes it worth considering is that the Gamma 20 is a respected vintage synthesized FM tuner with rack-mount appeal and solid collector interest, so a clean, fully working example has real upside for a Nikko stack. If this one includes the original faceplate, wood case, or proof of recent alignment, the premium is easier to justify; if not, I’d want stronger photos and confirmation of reception, display, and all controls before paying near this level.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Nikko Audio emerged from Nikko Electric Industry Co., founded in 1933 in Kanagawa, Japan, initially as a manufacturer of fuses and electrical equipment for the national railroad. Post-World War II, the company expanded into communications technology, entering the hi-fi market in the late 1960s through the influence of an audiophile family member with exceptional hearing. This Japanese heritage fueled a brief but notable run of precision-engineered audio components before the brand shuttered its audio division amid the 1990s market downturn.
The brand focused primarily on amplifiers, producing standout series like the Alpha line of power amps from the late 1970s and early 1980s, and the high-end TRM series, including the 1975 TRM-800 integrated stereo amplifier with its robust 65 watts per channel output, NEC power transistors, and stability down to 4 ohms. Tuners such as the FAM-600 and compact hi-fi gear rounded out their compact-form-factor offerings, emphasizing clean circuit design and no-frills power over expansive categories like speakers, turntables, or modern digital components.
Today, Nikko holds a cherished position among vintage collectors, prized for its build quality and dynamic sound that rivals contemporaries from more prominent Japanese marques. Though limited in distribution during its era, these components endure as attainable high-fidelity treasures, evoking the golden age of Japanese amplification engineering.
See all Nikko listings on RADAR.
