If you can
do without a computer but insist on recording/playback performance quality as
high as that in our top-of-the-line KD-A8, you want JVC's KD-A77. it has
three-head monitor capability and is ready to play back, record and erase the
new metal tapes thanks to our SA Heads. Full-Logic 2-Motor transport means
operational ease. The slim and trim profile makes it an ideal match for your
sophisticated hi-fi setup.
You can hear
the sound you've just recorded as you record with this 3-head deck.
Now you can
hear your tapes as you record them. You can compare the original with the
recorded signals instantly; with no chance of mistake, you can be sure you're
getting the most out of your tape and deck. The
three heads in the KD-A77 are contained in two housing, one for the
2-Gap SA Erase head, the other holding the combination Record and Playback
heads of the SA type. Ideal gap widths for for the latter two mean better
recording and better response.
Special
Features:
Three
Sen-Alloy heads; combined SA record/play (X-cut type) heads make possible
record monitoring. The erase head is a 2-gap head also made from SA.
Two motor ID
mechanism; this mechanism incorporates a newly developed back Tension system
which gives improved tape contact with the head.
Self-illuminated
buttons for full logic mechanical operation (excluding Stop or Rec-Mute modes.)
Three
position Metal-Tape-Compatible tape select switch. (automatic switching between
SA/Chrome and Normal)
The Rec Mute
button is at the right side of the mechanical operation buttons.
Super Automatic Noise Reduction System (ANRS),
which reduces tape hiss to an inaudible level
and Super ANRS which improves linearity at high frequencies are
incorporated.
2-stepped
Gear/Oil Damped Cassette Lid
New
Metal-Tape-Compatible multi-peak level indicators (+9, +6, +3, -2, -7 dB),
together with back-lit VU meters with the expanded coverage from +7 VU to -20
VU, meke level observation easier.
Memory
Stop/Play and Timer Standby (Rec and Play)
Output
Volume Control, for Line and headphones use
1 - SA Recording Head
2 - 4 µm
gaps
3 - 1 µm gaps
4 - X-cut SA Playback Head
5 - SA chips
6 - Shield
plate
7 - Zinc die-casting head base
Combination
SA heads for recording and playback.
Due to its
high recording density, Metal Tape requires recording and playback heads that
are made of materials having a greater maximum magnetic flux density than
conventional ferrite or permalloy. The combined record/playback heads, newly
developed for the KD-A77, both employ SA to ensure high performance.
The SA head
has advantages over conventional heads in various fields such as fewer core
loss, greater gap accuracy, better wear and corrosion resistance. However, its
biggest feature is its high maximum magnetic flux density. Because of this, the
SA head can bring the most out of the superior performance of metal Tape. This
is especially true for its extended frequency response at high frequencies;
something that has never been possible to realize with usual cassette tapes.
The playback
head incorporates a unique X-cut core structure to improve the characteristics
of the low frequency range. With ordinary core configurations, playback output
is subject to peaks and dips in the low frequency range. This is called the
"contur effect"; this effect is caused by interference between the
length of the tape-to-head contact area and the wavelength of the recording
frequency. With the X-cut design the core is cut diagonally to enable the tape
to leave the head, not abruptly, but with a gradually lessening contact area.
Specifications
KD-A77
Type: Stereo
Cassette Deck
Track
system: 4-track, 2-channel
Tape
Speed: 4,8 cm/sec. (1-7/8 inch/sec)
Motors: FG Type DC Servo Motor for Capstan; DC Motor
for Reel
Heads: 3 Sen-Alloy heads
SA head for
recording
X-cut head
for playback
2-Gap head
for erasing
Frequency
Response
At -20 VU
Recording:
Metal Tape
: 15 - 20,000 Hz [25 - 18,000 Hz (±3
dB)]
SA/Chrome
Tape : 15 - 20,000 Hz [25 - 18,000 (±3
dB)]
SF/Normal
Tape : 15 - 19,000 Hz [25 - 17,000 Hz
(±3 dB)]
At 0 VU
Recording:
Metal Tape
: 25 - 12,500 Hz (±3 dB)
SA/Chrome
Tape : 25 - 8,000 Hz (±3 dB)
Signal-to-Noise
Ratio:
ANRS - OFF
: 60 dB (weighted, 1 kHz, 3% THD, Metal
tape)
ANRS- ON
: Improved by 5 dB at 1 kHz and 10 dB
above 5 kHz
Effects of
Super ANRS (Normal Tape)
Improvement
of S/N Ratio : The same as with ANRS
Improvement
of Frequency Response [0 VU / +5 VU Recording]:
6 dB at 10 kHz / 12 dB at 10 kHz
Improvement
of Distortion [0 VU / +5 VU Recording]:
3% or less at 10 kHz / 3% or less at 10 kHz
Wow and
Flutter: 0,04% (WRMS); 0,14% (DIN 45 500)
Harmonic
Distortion: K3 : 0,4%; THD : 1,0% (Metal tape , 1 kHz)
Fast Forward
Time: 85 sec. Or less (with C-60
cassette)
Rewind
Time: 85 sec. Or less (with C-60
cassette)
Bias
Frequency: 85 kHz (AC bias)
Erasure: 85 kHz (AC
erasure)
Input Terminals:
Microphone
Jack x 2
Max
Sensitivity/ Matching Impedance : 0,2 mV
(-72 dBs)/600 Ω - 10 k Ω
Line In Jack
x 2
Min.
Input level/ Impedance : 80 mV (-20
dBs)/100 k Ω
Output Terminals
Line Out
Jack x 2
Output
level/Impedance : 0 - 300 mV/6 k Ω
Matching
Impedance : 50 k Ω or more
Phones Jack
x 1
Output
Level/Impedance : 0 - 0,5 mW/8 Ω - 1 k Ω
Semiconductors: 49 Transistors; 18 ICs;
14 LEDs; 59 Diodes
Power
Requirement: AC 100/120/220/240 V, 50/60
Hz
Power
Consumption: 36 W
Dimensions
(W x H x D): 450 x 120 x 160 mm (17-3/4
x 4-3/4 x 12-7/16 inches)
Weight: 8,3 kg (18,3 lbs)
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