Revox B77 MKII High Speed Reel to Reel - Serviced

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General:
The Revox B77 MLII is a classic reel to reel machine. It has excellent recording and playback performance as it's also capable of 15 IPS.

This model is so good that Revox themselves repair vintage models and sell them for 8980 Euro ($9810) each!

This particular unit was serviced in house at SkyFi and is functioning great. It will include its original box, a pair of take up reels, and custom aluminum hub adapters.

The unit sits snuggly in a beautiful wood casing custom made for it which was re-stained in-house and looks fantastic. The power cord which is rather specific will also be included.

SkyFi Cosmetic Notes:
Some marks mainly visible at the rear. There are also some scratches behind the take up reels from rotational rubbing. The unit presents well overall.

SkyFi Technical Notes:
Replaced pinch roller, cleaned controls, calibrated meters and overload, biased tape, set record and PB levels, made test tape to near identical source.

Ownership:
Unknown

Connections:
RCA inputs and Outputs, Removable power cord

General Sound:
Neutral sound with little to no coloration

Cosmetic Condition:
8/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab.

Included:
Exactly as pictured and described above.

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Specs:
Motor:  2 x Reel, 1 x Capstan
Reel Size: Up to 10.5 Inch Reel
Tape Speeds: 7-1⁄2 and 15 IPS (Inches Per Second)
Wow and Flutter:  0.08% (7-1⁄2 IPS)
Frequency Response: 30Hz to 20kHz (7-1⁄2 ips)
Signal to Noise Ratio: 67 dB
Total Harmonic Distortion: 0.5%
Input: 40mV (line), 0.15mV (mic)
Output: 1.55V (line)
Semiconductors: 11 x IC, 1 x Opto-Coupler, 4 x Triacs, 60 x Transistors, 33 x Diodes, 5 x LED, 2 x Full Wave Rectifiers

Dimensions:
22.16" x 18.72" x 9.17"

Weight:
37 lbs.

Approximate Age:
1980

Link to Manual:
Click Here

Recommended Cables:
Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Testing Process:
First steps are performed to determine if the unit is a candidate for our full restoration process, or if it's just in need of a light service.

We perform a basic functionality test to ensure proper playback, fast forward, and rewind. We look for smooth operation of the motors, transport engagement, and associated rolling parts.

We then do an internal physical inspection to ensure the belts and rubber consumable parts are up to spec.

Internal components are checked to make sure there are no signs of heat stress or damage, particularly in the power supply section. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

A light service will involve replacement of belts and rollers, external cleaning of heads, mechanism and boards, and basic record and playback tests.

A full restoration will often include disassembly of the drive system and replacement of all consumable and wearable parts including pinch rollers, belts, brakes, and bearings. We then clean, lubricate, and re-assemble the drive and perform basic mechanical alignment to ensure proper tape path and head alignment.

Final calibration will involve adjustment of the playback, erase, and record heads, along with optimization of the bias for a specific tape type. We do this with the aid of a Sound Technology 1510A tape deck analyzer plus a Nakamichi T-100 Audio Analyzer with reference calibration tapes.

Final listening tests are performed while monitoring with our reference Grado HP-1 headphones and a variety of factory and custom reference recordings We find that there is no better system for critical listening on tapes than with headphones, especially when comparing a live feed to a recorded feed.