Nikko STA-7070 (production years unknown)
The Nikko STA-7070 is an AM/FM stereo receiver from the early 1970s. Nearly everything on record about it comes from a single period lab test. Stereo Review (January 1974, p.38) put the unit on the bench and came away with the impression of a very competent performer. That judgment rests on the measurements alone. The test figures showed a 34-watt reference power output (with −3dB half-power points noted) and residual distortion of 0.9 percent. On FM, the tuner delivered a 2.2dB capture ratio, a good 55dB of AM rejection, and an interstation-noise muting threshold of 40 microvolts, with the signal dropping out at 22 microvolts. The reviewer found the muting system better than average, though it had to be switched off to receive weak stations.
Known measured specs from the January 1974 review:
- Reference power: 34W (−3dB half-power points)
- Residual distortion: 0.9%
- FM capture ratio: 2.2dB
- AM rejection: 55dB
- FM muting threshold: 40µV; signal dropout at 22µV
Beyond that review, documentation is thin. No production years, original price, or detailed circuit information has surfaced, and the STA-7070's exact place in Nikko's lineup remains unconfirmed. It appears to have been a solidly measured early-1970s receiver.
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