Revox A77 w wersji MKIV rok produkcji 1974. Wersja 2 Track.

REVOX PERFORMANCE SPECIFICATIONS
FOR REVOX A77 MK I / REVOX A77 MK II / REVOX A77 MK III / REVOX A77 MK IV

Mechanical

Tape Transport
Three Studer eddy current motors. Electronically governed capstan motor. Electronic speed change. Solenoid operated via 3 relays.

Tape Speeds:
3.75 and 7.5 ips (9,5 cm and 19 cm/sec.) ± 0.2%
High speed Version: 7.5 and 15 ips (19 cm and 38 cm/sec.) ± 0.2%

Wow and Flutter:
max. ± 0.04% at 15 ips
max. ± 0.08% at 7.5 ips
max. ± 0.1% at 3.75 ips (Weighted at DIN Standard 45507)

Tape Slip:
Less than 0.2%

Reel Diameter
Maximum 10.5\" (26,5cm)
(Minimum hub diameter 23/8 inches)

Forward / Rewind
Fast winding time for 1800\' (1100m) is 92 seconds

Tape Heads
Three (Separate precision erase, record and playback heads.) Patented \'True Radius\' design ensures excellent S/N ratio and head wrap

Guide System:
The Heads, the capstan drive, and the machines tape guides are mounted to a one-piece casting to maintain precise alignment.

Operating position:
horizontal or vertical

Electrical

Monitoring
Individual stereo record and playback heads with separate preamps, plus separate record and play circuits permit full source-tape monitoring.

Equalization:
NAB Standard on both record and playback at all speeds.

IEC Standard switchable on playback only.

Record Playback
Frequency Response:
(Based on Revox 601)


15 ips - 30 Hz - 20 kHz ± 1.5 dB
7.5 ips - 30 Hz - 20 kHz + 2 / - 3 dB
3.75 ips - 30 Hz - 16 kHz + 2 / - 3 dB

Signal to noise:
2-Track:
15 ips - better than 66 dB
7.5 ips - better than 66 dB
3.75 ips - better than 63 dB

4-Track:
15 ips - better than 62 dB
7.5 ips - better than 62 dB
3.75 ips - better than 59 dB

Add 4 dB to the above figures with Dolby on, referenced to less than 2% THD
(Reference with Scotch 203 or Revox 601 or equivalent. Weighted as per CCITT C-curve to exclude supersonic bias noise.)

Distortion at full modulation
at 1 kHz:
Max. 2% at 15 ips and 7.5 ips.
Max 3% at 3.75 ips.

Crosstalk at 1 kHz:
Stereo, better than 45 dB
Mono, better than 60 dB

Bias frequency:
120 kHz, push-pull oscillator. Designed for low noise, high output tapes

Input sensitivity per channel
Microphone, switchable LOW/HIGH
LOW: 50 - 600 ohms (unbalanced) 15mV
HIGH: up to 100 K ohms 2.5 mV
RADIO: 33 K ohms 2.5 mV
AUX: 1 M ohms 33 mV

Output per channel
OUTPUT: max 2.5 rms @ 600 ohms
RADIO: max 1.2 rms @ 2.5 K ohms
PHONES: 200 - 600 ohms (no electrostatic)

Semiconductor complement:
54 Transistors; 32 diodes, 4 silicon rectifiers, 1 CdS-cell

Remote control:
Fully electric for all operation functions.

Output Amplifiers:
Plug-in optional. 2 x8 watts continuous rms power, 2 x10 watts music power as per IHFM, 4-16 ohms, less than 1% distortion.

Power Supply:
Electronically stabilized.

Mains voltages:
110, 130, 150, 220,240, 250V / 50-60 Hz.

Power consumption:
70 ... 100 watts

Dimensions:
(Wooden Cabinet)
161/4\" W x 141/8\" H x 81/2\" D.
(Measurements include knobs but not reels.)

Weight:
Approximately 34 pounds (» 15 kg)