Revox A77 (1967–1977)
Three motors, three heads, and a Swiss service manual that reads like an engineering thesis - the deck that put studio-grade tape on the home recordist's shelf.
Overview
The Revox A77 is a reel-to-reel tape recorder built by Revox and sold from 1967 to 1977. That is the run most sources agree on. Hifi-wiki lists manufacture stretching to 1981, and one Revox history places the fourth and final modification at 1974 through 1977. Treat the end date as approximate. What isn't in dispute is the layout: a two-speed quarter-inch machine with three motors (two capstans, one for reels), three heads (erase, record, playback), and a modular chassis that let a serious amateur treat it like a component rather than an appliance.
It became Revox's best-known product and is widely regarded as the most popular high-end reel-to-reel recorder ever made. The sales figures are contested. The fact sheet carries both a claim of over 300,000 units worldwide and a Russian-language history citing 150,000. Either number is a lot of machines at this price point. Period advertising called it "the incomparable Revox A77." At 7½ ips, wow and flutter is rated at 0.08%, frequency response at 30Hz to 20kHz, signal-to-noise at 62dB (sources conflict, with figures ranging from 59 to 63 dB), and total harmonic distortion at 0.6%. Those numbers are for the 7½ ips setting. The deck also runs 3¾ ips, and the slow-speed versions went as low as 1⅞ ips.
The A77 is the deck that made Studer-Revox a household name among home recordists. The company's studio heritage is real. The fact sheet notes that Bob Dylan, The Beatles, and Pink Floyd all recorded on Studer-Revox machines, and the A77 was the consumer-facing arm of that reputation. Stereo Review, as quoted in Audio (May 1969, p.11), measured response at 7½ ips within +0.5 dB and -2.0 dB from 20 to 20,000 Hz and declared it had never been equalled by any other recorder they'd tested. The same page carries Audio Record Review's verdict that the servo control made wow and flutter nearly impossible to measure. The meter dropped below the threshold of reliable readings for long stretches.
Key Features
Three-Motor Transport with Electronic Switching
Two reel motors and a dedicated capstan motor, all switched electronically rather than mechanically. The transport runs silent and cool, with no solenoid clatter and no heat soak after an hour of playback. Owners who've lived with the A77 tend to cite the transport as the reason the machine outlasted its contemporaries. Studio-Sound (February 1976, p.68) noted that more than eight years and hundreds of thousands of units after the MK I's November 1967 debut, the current MK IV was still outperforming and outlasting its competition in roles from home recording to automated broadcast.
Three Heads, and the Half-Track Question
Separate erase, record, and playback heads, not a combined record/play head. That means you can monitor off the tape while recording, and it is why the A77 was taken seriously in semi-professional use. The factory documentation is blunt about which version to buy: half-track heads are advisable for the high-speed version and for professional applications where the highest quality is required. Quarter-track variants exist and are common. The quarter-track machine is a fine home deck, but it isn't the same animal as a half-track A77.
Modular Construction
The A77 is built as a stack of plug-in cards and sub-assemblies. That is why the service documentation runs to 92 pages and why a page titled "Removal of Amplifier Cards" exists at all. The modular design allows integration with Revox FM tuners and amplifiers and supports efficient servicing. A repair on an A77 is a card swap or a component replacement, not a chassis teardown. The service literature is thorough and the parts are documented, so many A77s are still running.
Photoelectric End-of-Tape Sensing
The A77 uses a photoelectric end-of-tape switch, with the sensing element positioned just to the left of the recording head. It doesn't contact the tape. There is no mechanical feeler riding the reel, no wear point, and no false triggers from a slightly loose wind.
Dolby B and the Variant Maze
A Dolby B version exists, and in that version the record and playback processors are separate in each channel, not a single shared encoder/decoder. The service manual for the Dolby-equipped machine carries its own additional technical data section, measured with Revox 601 tape and the Dolby electronics switched on. Beyond Dolby, the A77 family sprawls: MK I through MK IV, half-track and quarter-track, two-speed and slow-speed. The MK II was an earlier enhanced model from the 1970s. The MK IV arrived in 1974 and ran to 1977.
NAB and IEC Equalization
The deck supports both NAB and IEC equalization curves, which matters if you're playing tapes cut on European or American machines. Reel capacity goes up to 10.5-inch reels, so the machine will take a full studio-size spool, not just the 7-inch home format.
Historical Context
The A77 evolved from earlier mono tape recorders and entered the stereo era as a high-fidelity machine designed for serious home recordists, delivering superior frequency response and low noise compared to tube-based predecessors. It earned international awards for engineering excellence and sound fidelity, and Revox considered it their most successful model.
Pricing is a mess of conflicting figures. The fact sheet carries an original range of 1,500 to 3,000 Swiss Francs, a reported US launch price of $599, and a period advertisement quoting "from $899." The $899 figure is the one most likely to reflect a later, better-equipped variant. The $599 figure is the one most likely to reflect the earliest US offering. Assume the A77 sat in the upper tier of home tape decks throughout its life.
The B77, introduced in 1977, was an improved version of the A77. It was the direct successor, and it took over the line as the A77 wound down. The A77 often integrated with Revox's AX series speakers and amplifiers, so complete Revox systems from the era still surface as matched sets. Both the A77 and B77 are noted for reliability and durability, and they continue to appear at auction and find buyers.
Collectibility & Value
Completed eBay sales over the past twelve months run $252 to $639, with a median of $401 and a volume of roughly two units per month. The market table dated October 2026 shows a high of $693, a median of $401, a low of $222, and a latest sale of $272. Recent data points include $222 in May 2026, $252 in June, and $530 in August. Those numbers exclude accessories, parts, and non-working units. A lot of what's listed on eBay is parts, and the fact sheet flags three separate $300 listings for "Record and Play Heads" that are likely duplicates or component sales rather than complete decks.
A working A77 typically trades in the $250 to $650 band depending on variant, condition, and whether it's been serviced. A Russian-language listing from St. Petersburg priced a unit at 60,000 ₽, noting serial number G198395, 220V power, and cosmetics described as very good for its age. Complete decks with the wooden case and original accessories tend to sit at the top of the range. Bare chassis and parts machines sit at the bottom.
Vintage units are highly collectible and remain sought after by tape enthusiasts for their warmth and dimensionality, qualities that digital formats often fail to replicate. The A77's reputation for reliability and durability is the reason the market hasn't collapsed. These decks still work, and when they don't, they can be fixed. Manuals are widely available, including a 92-page service manual, the operating instructions, and a remote owners manual. Parts surface regularly: circuit boards, wiring, metal parts. Replacement pinch rollers are available from at least one specialist, and the manufacturer claims they improve the wow-and-flutter specification.
The main caveat for buyers is variant confusion. An A77 is a MK I, II, III, or IV, half-track or quarter-track, two-speed or slow-speed, Dolby or non-Dolby. Know which one you're buying before you bid. A quarter-track two-speed machine and a half-track high-speed machine are very different propositions, and the price gap doesn't always reflect that.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ REVOX A77 Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $693 Latest $272 │ │ Median $401 Trend — │ │ Low $222 Volume ~2/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $700 ┤ │ │ │ . . │ │ │ │ │ $486 ┤ . │ │ │ │ │ │ │ │ │ .│ │ $200 ┤. . │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ █ █ █ █ █│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-05 2026-07 2026-08│ └──────────────────────────────────────────────────────────────────────────┘
eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.
eBay Listings
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