Optonica
RT-7070H/HB
Double
Recording /Playback Stereo Cassette Tape-Deck with Dual Dolby and APSS
To conquer
the performance problems of conventional cassette deck, Optonica divided the
functions of a deck into recording and playback systems and created the
RT-7070H/HB. Two independent transport systems driven by separate FG servo DC
motors are incorporated, each with its own compartment and amplifier. The
separate transport used only for recording features a wide-gap Sendust-and
Sendust recording head that provides high recording sensitivity, good linear
response and wide dynamic range. The 2-stage direct-couped NPN/PNP amp for the
recording section offers high saturation, extreme linearity and wide dynamic
range. The playback section is equipped with an ultra-narrow-gap
Sendust-and-Sendust playback head that results in an absolute minimum of gap signal
loss while optimizing frequency response across the frequency range. This
section has a 3-stage ICL amplifier with state-of-the-art FET circuitry that
eliminates the need for distortion-causing coupling capacitors. Dubbing can be
performed with none of the loss in quality usually associated with cables and
hook-up jacks. Each compartment has its own Dolby Noise Reduction system.
The
RT-7070H/HB is equipped with APSS for one-touch skipping or repetition of
desired selections, a record-mute button for one-touch editing, a 4-position
tape selector to provide the correct settings for metal, CrO₂, FeCr and normal
tapes. Digital meters display accurate input levels and have a peak hold
function.
Transport for recording/erase
and playback are driven by separate FG servo DC motors to ensure stable
motor speed.
Since each section performs
only its assigned functions, the tape-heads could be aligned with the
transport system for optimum tape alignment.
A wide-gap
Sendust-and-Sendust head to assure high recording sensitivity is used for
recording, while a double-gap head is provided for erasing to guarantee
clean response.
For the playback section, an
ultra-narrow-gap Sendust-and-Sendust head keeps gap signal loss to a
minimum and optimizes frequency response.
The two perfectly matched
tape compartments allow high quality dubbing for Tape 1 to Tape 2, while
the three-mode level control function facilitates dubbing.
Dolby Noise Reduction
vircuitry is provided for each tape compartment to reduce tape hiss.
The
MPX filter can be used to ensure optimum FM Dolby recordings.
APSS permits playback of
desired selections at the touch of a button.
Metal tape capability allows
you to makes use of the greatly extended frequency response, increased
dynamic range and lower distortion of metal tapes.
Specifications
Mechanical
Section
Motor
Capstan
Drive : FG servo DC-motor (Tape 1)
Reel Drive :
FG servo DC-motor (Tape 2)
Heads
Record/Playback
: Narrow-gap Sendust head (for playback - Tape 1)
Erase :
Double-gap Ferrite head (for erese – Tape 2)
Others :
Wide-gap Sendust head (for recording & monitor)
Wow and
Flutter:
DIN (45 500)
: ±0,15%
WRMS : ±1,0%
Tape Speed
Deviation: ±1,0%
FF/RW Time:
110 sec (C-60)
Audio
Section
Frequency
Response:
Normal
Position : 20 – 16,000 Hz (DIN 45 500); 30- 16,000 Hz ±3 dB
CrO₂
Position : 20 – 18,000 Hz (DIN 45 500); 30 – 18,000 Hz ±3 dB
Fe-Cr
Position : 20 – 19,000 Hz (DIN 45 500), 30 – 19,000 Hz ±3 dB
Metal
Position : 20 – 20,000 Hz (DIN 45 500), 30 – 20,000 Hz ±3 dB
Signal-to-Noise
Ratio (Fe-Cr Tape):
Dolby NR Off
: 57 dB
Dolby NR On
: 67 dB at over 5 kHz
Recording
Sytem: AC bias (105 kHz)
Erase
System: AC erase (105 kHz)
Input
Sensitivity/Impedance:
Line
-In : 50 mV/50 k Ω
Rec/Pb
(DIN) : 1 mV/ k Ω
Output
Level/Impedance:
Line-Out
: 1,000 mV/50 k Ω at 0 dB
Rec/Pb
(DIN) : 1,000 mV/50 k Ω at 0 dB
Headphones
: 125 mV/ 8 Ω at 0 dB
General
Power
Source: 110/220/240 V 50/60 Hz AC
Power
Consumption: 20 W (220 V)
Dimensions
(W x H x D): 430 x 114 x 321 mm
Weight: 7,5
kg
Colour Front
Panel:
Silver :
RT-7070H
Brown :
RT-7070HB
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