Yamaha K-1020
Yamaha's top-of-the-line three-head deck packed Dolby HX Pro, dbx, and a bias-tuning system that told you when the tape was right.
Overview
The K-1020 sat at the top of Yamaha's cassette deck lineup, and the hardware shows it: three heads, a closed-loop dual-capstan transport with a capstan on either side of the tape path, and a record/play head pair made of pure Sendust with an ion-plated ferrite erase head. Audio (March 1986, p.69) described the transport as providing stable, low-flutter tape handling — the kind of drive that keeps speed constant regardless of how the cassette shell behaves.
What separates the K-1020 from most of its contemporaries is Dolby HX Pro. It is not a noise-reduction system; it dynamically controls bias in response to the signal's spectral content to extend headroom. Audio (March 1986, p.69) noted the deck was one of relatively few to carry it. On top of HX Pro, the K-1020 offers Dolby B, Dolby C, and dbx noise reduction — a combination that lets it record with any of the three systems and play back virtually any prerecorded cassette.
Yamaha's own advertising billed the K-1020 as "one of the most advanced cassette decks in recorded history," and the ORBiT (Optimum Record Bias Tuning) system was a big part of that pitch. Press the TEST button, adjust the bias control until the ORBiT tuning indicator shows the bias is precisely set, and the deck is calibrated to the individual tape in the well — not just the tape formulation. Audio (March 1986, p.69) found that ORBiT did an excellent job getting record/playback response very close to the best possible, though the reviewer noted that minor bias trimming might still be worthwhile for the most critical listening.
The metering is a fluorescent, peak-responding stereo bar-graph display spanning -30 to +20, surrounded by annunciators for monitor, memory, auto mode, tape type, record status, NR system, multiplex filter, and bias-test status. Audio (March 1986, p.69) measured the meter scale calibrations as accurate to within a dB across most of the range, with errors of 0.6 dB at most between -10 and +4, and confirmed the meters met peak-responding requirements — though the 0.87-second decay time fell short of the 1.4-second standard minimum. The counter is a four-digit elapsed-time readout that keeps its calibration even during fast winding and holds its reading when a cassette is ejected, so you can note the position and write it on the label.
The master fader is a vertical slider intended for fades from full-off to full-on; Yamaha recommended leaving it at "0" otherwise. Audio (March 1986, p.69) found the two sections of the master fader tracked each other within a dB from full down to 60 dB of attenuation, with most scale markings accurate within a dB — excellent for making exact level shifts on both channels at once. The separate output-level control drifted more between sections, just over 1 dB at 20 dB of attenuation and 2 dB at 40 dB down. Output polarity matched the input in Source mode but was reversed in Tape mode.
Transport performance was solid. Audio (March 1986, p.69) measured average tape-play speed as stable across line voltage from 110 to 130 V, with short-term speed changes up to about ±0.015%. Flutter came in at 0.045% weighted rms and ±0.065% weighted peak on average, improving to 0.025% rms and ±0.045% peak with Yamaha's own NR tape. A C-60 side fast-wound in 68 seconds normally, or 48 seconds with the button held for the extra-high-speed mode — a 35% boost the reviewer admitted using more than expected. Fast winding automatically slows near the tape ends to prevent breakage, and the deck will rewind and stop exactly where recording started if rewind is pressed during recording.
Headphone output ran through an 8-ohm impedance rather than the more usual 50 ohms and delivered 2.1 mW per side — a bit under Yamaha's spec, but Audio (March 1986, p.69) reported maximum listening level at 0 dB was very high with all headphones tried, crediting the output-level control. The manual was singled out as one of the better ones the reviewer had seen, with good illustrations and an excellent block schematic. Internal construction was judged definitely above average, arranged to minimize service time. The reviewer's gripes were minor: the right record-level pot knob wasn't snug on its shaft (though it never came off), and the master fader's resistance was high for fast fading even though its action was smooth.
The K-1020 doesn't carry a long list of programming features, but the conveniences it does have are the ones used every day: elapsed-time counter, ORBiT, wide-range metering, Dolby and dbx NR, master fader, output-level control, and on-demand high-speed winding. Audio (March 1986, p.69) concluded it offered a nice combination of features and performance for its price and should compare favorably with other decks in its range. HiFi-Stereo (March 1986, p.59) noted that a difficulty encountered with the Yamaha gave indirect support for the value of a competitor's user-adjustable azimuth feature — a reminder that head azimuth alignment on playback is one thing the K-1020 leaves to a technician rather than the user.
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