Hitachi HS-1 M loudspeakers

Miniature Speaker System

If you're looking for big, high-quality sound but don't have the space to accommodate a big system, the HS-1M Miniature Speaker System is sure to satisfy you.

Just 185 mm high (not much more than a large book), these speakers can be placed almost anywhere - and they're portable too.

Optional mounting brackets permit free-angle installation on walls, ceilings, on the new window shelf of your car for maximum space savings.

Maximum power handling capacity is is a mammoth 80 watts, and output sound pressure level is an impressive 85 dB. So even if you own a large power amplifier, there's no worry of damaging or distorting these speakers. They'll give you plenty of output from small amps as well.

 

Woofer

The HS-1M woofer is 4-inch cone-types employing carefully selected cone paper for maximum fidelity and strength. Remarkably smooth reproduction from powerful bas to rich midrange is assured thanks to the incorporation of special Hitachi Actuators, special low-distortion magnetic circuits in which the center pole is covered with a cooper short cap. This unique feature minimizes high-frequency distortion due to interaction between the voice coil and magnetic circuit, permitting only the purest of sounds to come through.

High power handling capacity is realized through the use of a thermo setting adhesive with superior thermal properties for the voice coil and bobbin.

 

Tweeter

Titanium-dome, an extremely light, but durable, metalic element is used for the HS-1M tweeter dome, providing uniform quality and low distortion. The small size of dome itself permits wide frequency response and excellent dispersion.

Accurate spatial imaging and resolution in the HS-1M is amazing for their size. This is due to careful design , and to the selection of 2,700 Hz for the crossover frequency.

 

Solid Diecast Aluminum Cabinet

The HS-1M enclosures are precision-processed diecast aluminum alloy. This virtually eliminates the possibility of box resonance, buzzes and rattles or air leaks. You get dynamic, resonant-free reproduction over the entire audible spectrum.

 

Specifications

Type:  2-way closed

Enclosure Volume:  1,6 liters

Speakers

Woofer :  4" (100 mm) Cone

Tweeter :  1" (25 mm ) Dome

Crossover Frequency:  2,700 Hz

Frequency Response:  50 Hz - 20,000 Hz (-15 dB)

Impedance:  8 Ω

Sound Pressure Level:  85 dB (1W/1m)

Maximum Input Power:  50 Watts; (80 Watts Music)

Enclosure Finish:  Black (painted)

Grill Cover:  Black

Dimensions (W x H x D):  4-5/8" x 2-1/4" x 4-3/4"

Weight:  2,5 kg (5 lb 8 oz)

 

Hitachi HS-335 loudspeakers

High Fidelity 3-way Speaker System

3-way speaker system with 10-inch woofer, 5-inch mid-range and 1-inch dome tweeter

Excellent sound reproduction capability

Beautiful walnut grain finish cabinet for long life.

 

The Hitachi model HS/335 high fidelity loudspeaker reflects all the refinements of the "state-of-the-art." acoustic design while incorporating fine cabinetry to compliment any decor.

The unit features a 10-inch rolled edge woofer with aluminum voice coil bobbin and carbon fiber cone giving rich bass response with low distortion. The HS/335 also features a 5-inch mid-range cone and a 1-inch titanium diaphragm dome tweeter. Frequency response of the HS/335 is 45 Hz to 18 kHz ±4 dB.

Crossover points are a 700 Hz and 3000 Hz . The speaker box itself is a sealed acoustic suspension structure with a 38 litre cubic volume.

Sound pressure levels of 91 dB (8 Ω ) 1m/1 W, are generated, representative of the efficiency of this unit.

The speaker cabinet exterior is wood grain vinyl on wood products and is finished with handsome removable matte charcoal brown grille cloth.

 

Specifications

Speakers

Woofer :  10" rolled edge type woofer with aluminum voice coil bobbin and carbon fiber cone

Mid-range :  5" cone driver

Tweeter :  1" titanium dome driver

Crossover Frequency:  700 Hz, 3000 Hz

Cabinet:  Wood grain vinyl on wood products. Charcoal brown removable grille cloth. Sealed acoustic suspension 38 litre cubic volume

Frequency Response:  45 Hz - 18,000 Hz ±4 dB

Sound Pressure Level: 91 dB 1m/1W

Tweeter Level Control:  0 - 3 dB

Dimensions (W x H x D):  12-3/8" x 21-5/8" x 12-3/8"

Weight:  28,6 lbs

 

Hitachi HT-61S turntable

 

Full-Automatic Direct-Drive Turntable

Fully automatic operation with all controls on the front panel provides outstanding convenience in each model; the HT-61S (HT-R10) gives you a few extras. In short, these turntables leave nothing to be desired. This TH-R10 can be used with the RM-1000 remote control center for extra convenience, too.

 

Automatic disc Size/Speed Selection

The HT-61S/R10 uses a light beam to sense the size of the record on the platter and automatically set the lead-in for either 30-cm or 17-cm, so the stylus will lower to exactly the right place. At the same time, platter speed is automatically set to the corresponding speed; 33-⅓ or 45 rpm. This makes operation surer and more convenient, putting the HT-61S/R10 another step above ordinary turntables.

 

All Controls Up Front

All Control functions are located on top of the turntable's front panel. They are accessible when the dust cover is down, preventing the possibility of jarring the tonearm during play. And thanks to the use of IC logic circuitry, it only takes a feather touch to operate all controls.

 

Other features:

Quartz Lock Plus High Torque Equals Speed Accuracy,

Unitorque Motor,

Gimbal-Suspension Straight Tonearm,

Photo Sensor Arm Return System

Resonance-absorbing base

Anti-feedback insulator feet

Removable, hinged dust cover

High quality headshell ideally matched to tonearm

Optional remote control capability for HT-R10

 

Specifications:

Type:  Full automatic, 2-speed, quartz lock , direct-drive

Platter:  Aluminum alloy diecast 310 mm outer diameter

Motor:  Brushless coreless, slotless "Unitorque" motor; DC motor for arm movement.

Speed:  33-13 and 45 rpm

Speed Change System:  Electronic changeover system

Signal-to-Noise Ratio:  78 dB (DIN-B)

Wow and Flutter:  0,025% WRMS

Speed Accuracy:  0,003%

Speed Drift

Time :  0,003% (30 sec - 303 min)

Temperature :  0,003% (5 - 35°C)

Tonearm

Type:  Static-balanced, straight

Headshell:  ADC type

Tracking Error:  2°

Adjustable Force Range:  0 - 3 g / 1 turn of the balance weight (directly readable in 0,1 g steps)

Acceptable Cartridge Weight:  4 - 10 g

General

Dimensions (W x H x D):  435 x 365 x 110 mm (17-1/8" x 14-3/8: x 4-5/16")

Weight:  6 kg (13 lbs 3 oz)

Hitachi HT-60S turntable

 

Full-Automatic Direct-Drive Turntable with Quartz Lock, 

Unitorque Motor, Gimbal-Suspension Straight Tonearm 

and Photo Sensor Arm Return System

 

This model feature a sleek, clean design, convenient operation, and the superior quality and reliability that advanced Hitachi technology makes possible. They combine the proven excellence of Hitachi's Unitorque motor and quartz-lock PLL servo system with the latest improvements in tonearm design from the Hitachi Audio R&D labs; gimbal-suspension straight tonearm with photo-sensor return system. Fully automatic operation with all controls on the front panel provides outstanding convenience in each model; the HT-61S (HT-R10) gives you a few extras. In short, these turntables leave nothing to be desired. This TH-R10 can be used with the RM-1000 remote control center for extra convenience, too.

 

Unitorque - A Unique Motor

The HT-60S is direct-drive turntables - the  platter is driven directly by the motor. Overall performance, then, is directly dependent on motor performance. Other turntables use either multi-pole DC motors or AC motors, which have various disadvantages. AC motors are extremely inefficient and subject to vibrations; DC motors suffer from uneven torque - they rotate in a series of "steps" or "puls", which must be smoothed out by adding more poles/slots or extra servo circuitry - complicated, unreliable, costly measures which are only partially effective.

The Unitorque motor prevents these problems from occurring at all. It is a brushless, slotless, coreless motor with perfectly smooth, even torque (hence the name, Uni-Torque) its unique design employs two star-shaped flat coils positioned in such a way that their independent torques combine to produce constantly even torque throughout each rotation. A 240-pole magnetic rotor provides added stability. The Unitorque motor thus features precision, reliability and efficiency superior to other types of motors.

 

Quartz Lock Plus High Torque Equals Speed Accuracy

Complementing the Unitorque motor is a quartz-lock PLL (Phase-Locked-Loop) servo system. While conventional servo systems must rely on a reference voltage (subject to fluctuation due to variations in supply and temperature), these two models use a quartz crystal oscillator, whose pulses never vary in the slightest degree. They are compared to pulses directly from the motor so even infinitesimal speed variations can be detected and corrected. And thanks to the high torque of the Unitorque motor, this process occurs much faster than in conventional systems. It all adds up to outstanding speed accuracy; wow and flutter is an extremely low (0,025%). As an added touch, a quartz lock indicator is provided to inform you when the turntable has reached operating speed and the quartz PLL circuit has locked in.

 

Gimbal-Suspension Straight Tonearm

The HT-60S employ Hitachi's new straight-line tonearm design, developed through an extensive testing process. Its low mass characteristics provide superior tracking capabilities, and bring out all the performance possibilities of high compliance cartridges. And its highly symmetrical, precise construction eliminates much of the resonance that conventional cartridges suffer from. The tonearm is mounted on a gimbal support system. This gimbal suspension allows free movement in both vertical and horizontal directions, for optimum balance during tracking. This means lighter, more sensitive tracking for better reproduction quality with less stylus and record wear. An easy one-touch anti-skating control further increases tracking accuracy by counteracting the force which pulls the tonearm toward the center of the record.

 

Photo-Sensor Arm Return System

This Hitachi systems is clearly superior to conventional arm return methods. Ordinarily, auto-cut and auto-return are triggered by mechanical contacts or linkages connected to the base of the tonearm. They cause a certain amount of drag, inhibiting tonearm movement sufficiently to produce distortion. In addition, they are subject to wear and mechanical failure,

The photo-sensor system is much more sophisticated. The only thing that touches the tonearm assembly is a light beam. It passes from an LED to a photo-sensitive cell. When the arm, reaches the end of the record, a thin plate attached to the base cuts the light beam. This change in light intensity causes the cell to activate a switching circuit, which in turn activates a small arm-drive motor. This entire system is located far away from the main drive mechanism, so it does not affect reproduction quality at all. Phot-sensor arm return - an elegant innovation that improves performance and reliability.

 

Full Automatic Convenience

All tonearm movements are automatically controlled, and driven by a separate DC motor. Pushing the start button initiates arm movement to the correct position over the record and then lowers the arm. This button can also be used to interrupt play (cut). At the end of the record, as described above, the photo-sensor system returns the arm, then shuts off the motor. A repeat function is also included to let you hear a record more than once without having to touch the unit.

  

 

Specifications:

Type:  Full automatic, 2-speed, quartz lock , direct-drive

Platter:  Aluminum alloy diecast 310 mm outer diameter

Motor:  Brushless coreless, slotless "Unitorque" motor; DC motor for arm movement.

Speed:  33-13 and 45 rpm

Speed Change System:  Electronic changeover system

Signal-to-Noise Ratio:  78 dB (DIN-B)

Wow and Flutter:  0,025% WRMS

Speed Accuracy:  0,003%

Speed Drift

Time :  0,003% (30 sec - 303 min)

Temperature :  0,003% (5 - 35°C)

Tonearm

Type:  Static-balanced, straight

Headshell:  ADC type

Tracking Error:  2°

Adjustable Force Range:  0 - 3 g / 1 turn of the balance weight (directly readable in 0,1 g steps)

Acceptable Cartridge Weight:  4 - 10 g

General

Dimensions (W x H x D):  435 x 365 x 110 mm (17-1/8" x 14-3/8: x 4-5/16")

Weight:  6 kg (13 lbs 3 oz)

Hitachi D-E99 cassette deck

The Hitachi model D-E99 is a three -head stereo cassette deck with microprocessor-controlled adjustment for record bias, equalization, and tape sensitivity. It incorporates both Dolby B and Dolby C noise-reduction systems. And uses a solenoid-operated twin-capstan drive system with motor for the capstan and second for the reel hubs.

Also features:

Automatic Tape Response System (ATRS); Titanium-Surfaced Rec and Play Combination 3-Head System; Metal Tape Compatibility; Dual Fluorescent Peak Level Meter; Electronic Digital Counter, and Timer Rec/Play Capability

Specifications

Motor:  FG servo motor and DC motor

Heads:

1,4 mm gap Metal Rec/Pb ferrite head

Ferrite guard Metal erase Permalloy head

Semiconductors:

58 Transistors ; 58 Diodes; 2 FETs; 14 LEDs; 11 ICs; 5 Modules

Track System:  4 track, 2 channel stereo

Tape:  cassette Tape C-30. C-60, C-90

Tape Speed:  4,75 cm/s

Recording System and Bias Frequncy:  AC bias, 105 Hz

Erasing System:  AC erase

Erase Ratio:  65 dB or more (at 1 kHz)

Frequency Response:

Normal :  20 Hz - 19 kHz (30 Hz - 17 kHz ±3 dB)

Cro2 :  20 Hz - 21 kHz (30 Hz - 18 kHz ±3 dB)

Metal :  20 Hz - 21 kHz (30 Hz - 19 kHz ±3 dB)

FeCr :  20 Hz - 19 kHz  (30 Hz -17 kHz ±3 dB)

Signal-to-Noise Ratio

Dolby NR Off :  61 dB (weighted A, reference 3% THD.  Metal tape)

Dolby B NR On :  69 dB (weighted A, reference 3% THD. Metal Tape)

Dolby C NR On :  75 dB (weighted A, reference 3% THD. Metal Tape)

Wow and Flutter:  0,032% WRMS (0,10% DIN)

Input Sensitivity/ Impedance:

Microphone :  0,4 mV/  300 Ω - 5 kΩ

Line In :  100 mV/ 50 k Ω or more

Output Level:  500 mV

Output Load Impedance:

Line Out :  50 k Ω or more

Headphones :  8 Ω - 2 k Ω

Distortion:  0,8 % (1 kHz , 160 nwb/m)

Crosstalk:  60 dB or more (at 1 kHz)

Channel Separation:  30 dB or more (at 1 kHz)

Power Supply:  AC 120V, 100-110 V, 115-127 V, 220-220 V, 230-240 V, 50/60 Hz

Power Consumption:  29 W

Dimensions (W x H x D):  435 x 110 x 282 mm

Weight:  6,3 kg

Hitachi SR-4010 receiver

Hitachi SR-4019 AM/FM stereo receiver FTC rated for 8 ohms at 25 watts RMS per channel, 20 Hz to 20 kHz , at no more than 0,05% Total Harmonic Distortion

Features include:

Left and right 5 step LED output power indicators, calinrated at 0,01; 0,1; 1; 10 and 30 watts into 8 ohms, that also serve as an FM tuning indicator (left meter) and AM/FM signal strength meter (right meter); an FM stereo beacon; an FM mute that is applied automatically when the receiver is in the stereo mode (the mute is off when the receiver is set for full time mono); and a subsonic filtter that is applied automatically when the LED indicators are switched to the tuning indicator mode (the subsonic filter is off when the meters are switched to indicate output power)

There are inputs for magnetic phono, and tape Outputs for two speaker systems, tape and [phones. Controls are provided for tuning volume, balance, ganged bass, ganged treble, speaker selection, and input selection/FM muting. There are switched for loudness compensation, tape monitor, and meter mode/subsonic filter.

The FM antenna input is 75/300 ohms. An internal antenna and external connection are provided for AM. There is one unswitched AC outlet.

Tuner performance

FM Tuner. Full limiting was attained with 2,8 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 8 µV. The stereo high fidelity sensitivity (55 dB quieting) was 90 µV. Full mute release was attained with 6 µV. At standard test level the stereo frequency response measured +0,2/-1,5 dB from 40 to 15,000 Hz, down 2,2 dB at 30 Hz . Monophonic distortion measured 0,2% Total Harmonic Distortion, stereo distortion was 0,5% Total Harmonic Distortion. The signal to noise ratio measured 67 dB. Stereo separation was 36 dB. Selectivity was very good. The 19 kHz FM pilot leakthrough is some what higher than average. Make certain the MPX filter on a Dolby recorder is switched in when recording from FM. On most recorders the MPX filter is automatically applied with the Dolby.

AM tuner. Background noise was higher than average.

Amplifier peformance. The power output per channel at the clipping level with both chaannels driven 20 to 20,000 Hz into 8 ohms measured 27 watts RMS. The frequency response at 27 watts/8 ohms measured +0 dB -3 dB from 20 to 20,000 Hz at a distortion no higher than 0,06% Total Harmonic Distortion at any frequency. The subsonic filter produced 2,5 dB attenuation at 20 Hz. The tone control range measured =11/-12 dB at 50 Hz ; ±8 dB at 10,000 Hz. The magnetic input hum and noise was -69 dB; stero separation was into the noise level.

Meters

The LED output power indicators, because of the broad range between values, indicate approximate power. They serve as a reference rather than as precise value. Their frequency response is essentially "flat". When used as tuning meters the right indicator functions as light-bar )or bar-graph) signal strength meter, while the center LED in the left indicator serves to indicate proper tuning-it snaps on when an FM station is tuned properly; essentially, the LED substitutes for a center-channel tuning meter.

Dimensions (W x H x D):  17-1/8" x 4-3/8" x 11-1/8"

Hitachi HA-2500 amplifier

Features:

Low-distortion power amplifier

Connection facilities for two pairs of speakers

New ICs in the Equalizer

Subsonic filter that cuts out rumble and wow in the ultra-low frequencies without impairing the sound quality

LED program source indicators

Specifications

Power Output (Both channels driven):

20 W/ch + 20 W/ch ( into 8 Ω , 40 - 20,000 Hz ,T.H.D. 0,07%)

23 W/ch + 23 W/ch (into 8 Ω , 1 kHz, T.H.D. 0,07%)

25 W/ch + 25 W/ch (into 4 Ω , 1 kHz, T.H.D. 0,07%)

Power Bandwidth:  20 Hz - 20 kHz

Frequency Characteristics:

Tuner, Tape :  20 Hz - 40,000 Hz  (+1, -1,5 dB)

Phono :  RIAA ±0,7 dB

Total Harmonic Distortion ( at 8 Ω )

At rated output :  less than 0,07%

At 1/2 rated output :  less than 0,05%

Intermodulation Distortion

At 1/2 Rated Output:  less than 0,05%

Input Sensitivty/impedance:

Phono :  2,5 mv /47 k Ω

Tuner :  150 mV/40 k Ω

Tape :  150 mV/40 k Ω

Output Level

Tape Output:  150 mV (phono, Tuner)

Phono Overload Level :  140 mV ( at 1 kHz, T.H.D.0,05%)

Signal-to-Noise Ratio (IHF a Network):

Phono :  70 dB

Tuner, Tape :  90 dB

Damping Factor:  30 (1 kHz, 8 Ω )

Bass Control:  ±8 dB at 100 Hz

Treble Control :  ±8 dB at 10 kHz

Loudness Contour:  =9 dB (at 100 Hz)

Subsonic Filter:  20 Hz (-6 dB/oct)

Semiconductors:  2 ICs,  25 Transitors, 13 Diodes, 2 LEDs

Power Supply:  120 V, 220 V, 240 V, 50/60 Hz

Power Consumption:  170 W (at rated output)

Dimeensions (W x H x D):  435 x 110 x 275 mm

Weight:  5,4 kg

Hitachi SR-1100 receiver

AM/FM Tuner Amplifier

No effort has been spared,no detail overlooked to make this one of the finest tuner amplifier available anywhere. From its FET equipped FM front end to its spring-loaded, one touch speaker trminal, every circuit and control has been designed with typical Hitachi fastidiousness. Accurate tuning is easy with signal strength and centre-zero tuning meters, and a muting control eliminates FM squelch. Further accuracy and clarity are guaranteed by ceramic filters and a time switching MPX decoder.

Auxiliary Circuits

Power and speaker (A, B) switch

Function switch, including muting switch

Mono-stereo switch

Loudness and High, Low filter switch

Tape monitor switch

Phono sensitivity switch

Pre-mainswitch

FM aerial attenuator

Headphones and Microphone socket

Specifications

FM Section

Frequency Range:  88 - 108 MHz

Usable Sensitivity:  1,6 µV

Total Harmonic Distortion

Mono :  0,3% (1 kHz)

Stereo :  0,8% (1 kHz)

Image Rejection:  85 dB

IF Rejection:  100 dB

Capture Ratio:  0,8 dB

Stereo Separation:  42 dB (1 kHz)

Signal-to-Noise Ratio:  70 dB

Alternate Channel Selectivity:  65 dB

Aerial Impedance:  300 Ω

AM Section

Frequency Range:  530 - 1605 kHz

Usable Sensitivity:  10 µV

Image rejection:  73 dB

IF Rejection:  76 dB

Signal-to-Noise Ratio:  48 dB

Audio Section

RMS Power Both Channel Driven: 

65 W x 2 at 4 Ω, T.H.D. 0,5%

55 W x 2 at 8 Ω, T.H.D. 0,5%

Frequency Response:  20 - 50,000 Hz

Power bandwidth:  20 - 30,000 Hz

Distortion:  0,05% (1 kHz)

Signal-to-Noise Ratio:

Phono  Low :  65 dB

Phono High :  70 dB

Aux :  85 dB

Damping Factor:  50

Input Sensitivity:

Phono Low :  1,8 mV

Phono Hgh :  4 mV

Aux :  125 mV

Mic ;  2 mV

Tape Monitor :  500 mV

Main In :  800 mV

Output Sensitivity Rec Out :  500 mV

Tone Controls:

Bass :  ±16 dB at 50 Hz

Treble :  ±16 dB at 15 kHz

High Filter :  -10 dB at 10 kHz

Low Filter:  -8 dB at 50 Hz

Loudness (Volume at -30 dB):  +10 dB at 50 Hz ; +4 dB at 10 kHz

Dimensions (W x H x D):  446 x 137 x 330 mm (17-1/2" x 5-3/8" x 13")

Weight:  12,6 kg (27,8 lbs)

Hitachi HA-5300 amplifier

Features:

Dynaharmony system perfectly matched for music reproduction

Current mirror circuit in the Class A driver circuit

32-contact attenuator volume control for an accurately adjusted level control

Independent 3-stage adding gain selector for extended fine setting range

3-stage direct-coupled equalizer amplifier composed of 2 FET and 2 transistors with differential amplifier for first stage.

Easy listening comparison with speaker level control

Phono input capacitance selector switch

Low filter that reduces hum and rumble in the ultra-low frequencies without impairing the sound quality.

High filter that effectively cuts out noise produced from scratches on records and high frequency noise during AM and FM reception.

Tone defeat switch for instant flat characteristics

Protective circuitry for safety

 The new protection circuit of Hitachi

Muting Cuircuit

This set contains the muting circuit which cuts off the relay approx. 3,5 seconds after the power switch is turned on to eliminate the click sound generated by power switch operation.

ASO (Area of Safety Operation) detection circuit (output transistor protection)

This circuit functions to protect the transistors (Q711-Q714) from damage.

Especially when the voltage (Vce) between C - E of the output transistors is too high, the transistors are likely to be damaged when excessive collector current (Ic) flows. In this set, the protection circuit is designed to operate when Ic and Vce exceeds a certain value.

DC Voltage Detection Circuit (speaker protection)

When the DC voltege may appear at the speaker terminals during a malfunction, it may make speaker in trouble. To prevent this, the DC components in the output terminals are detected by the filter circuit of R818 and C811; when it is (+) voltage, Q803 is turned on, Q805 is turned off, and the speaker circuit is cut off by the relay; when it is (-) voltage, Q805 turns off by turning Q804, Q806 on and the relay is also operated. Incidentally, this protection circuit is reset automatically when the DC voltage disappears.

When the input terminals are touched by something or when some ultra low-frequency noise enters, speaker inputs are cut off temporarily but they reset automatically.

Specifications;

Power Section

Circuitry:  2-stage differential all-stage direct-coupled 4-power supply high-efficiency pure complementary OCL system (Dynaharmony System)

Dynamic Power Output:  260 W (IHF 8 Ω)

RMS Power (both channels driven):

60 watts per channel, min. RMS, at 8 Ω from 20 Hz - 20 kHz, with no more than 0,3% T.H.D.

75 W/ch + 75 W/ch (8 Ω, 1 kHz, 0,3% T.H.D.)

85 W/ch + 85 W/ch (4 Ω, 1 kHz, 0,3% T.H.D.)

Power bandwidth :  10 Hz -50 kHz

Total Harmonic Distortion (1 kHz, 8 Ω load):  0,05% (at rated output)

Intermodulation Distortion (60 Hz : 7 kHz = 4 : 1):  0,05% (at 1/2 rated output)

Damping Factor:  more than 40

Output Treminal:

Speaker :  A, B (4- 16 Ω), A + B (8 - 16 Ω)

Headphone :  more than 4 Ω

Speaker level Control:  B level is variable  -15 dB

Inpuut Sensitivity /Impedance:  1,0 V (55 k Ω)

Preamplifier Section

Circuitry: 

Equalizer amp. :  Differential 1-stage, 3-stage directly coupled

Control amp. :  NF type

Input Sensitivity/Impedance:

Phono 1, 2 :  2 mV/50 k Ω

Tuner, Aux :  100 mV/50 k Ω

Tape 1, 2 :  100 mV/50 k Ω

Phono Overload Level:  350 mV at 1 kHz, 0,3% T.H.D. (Phono 1, 2)

Output Level/Impedance: 

Tape 1, 2 Rec Out :  100 mV/1 k Ω

Frequency Characteristics:

Phono :  30 - 15,000 Hz (RIAA ±0,2 dB)

Tuner, Aux :  10 Hz - 50 kHz (+0 -2 dB)

Tone Controls:

Bass ;  ±8 dB at 100 Hz

Treble :  ±8 dB at 10 kHz

Filters:

Low :  20 Hz (12 dB/oct)

High :  8 kHz (6 dB/oct)

Loudness Control (Volume -30 dB):  +8 dB at 100 Hz , +4,5 dB at 10 kHz

Signal-to-Noise Ratio  (IHF, A network):

Phono 1, 2 :  75 dB

Tuner, Aux, Tape 1, 2 :  90 dB

Gain Selector;  -5, -10, -20 dB (addition type)

General

Semiconductors;  6 FETs, 44 Transitors, 43 Diodes

Power Supply:  120 V / 220 V / 240 V, 50/60 Hz

Power Consumption:  500 W at rated output

Dimensions (W x H x D):  435 x 166,5 x 391 mm

Weight:  12,3 kg (27, 1 lbs)

I like

Hitachi D-E55 cassette deck

Hitachi D-E55

Microcomputer-Controlled Cassette Deck with Metal-tape Compatibility, Feather- Touch Controls, Auto Rec Mute Function, and Dual 12-LED peak Meters.

The first thing that will impress you about the D-E55 is that it has the look and feel of a precision instrument. The handsome styling and the incredibly smooth operation provided by the built-in microprocessor and power-assisted feather-touch controls are unexpectedly luxurious considering the D-E55's accessible price tag. A large number of computer-controlled automatic functions have been incorporated, too - for exceptional flexibility and convenience. You get Auto Rec Mute, Auto Rewind Play/Stop, Computerized memory Rewind, Timer Play/Record, and provision for optional remote control.

Naturally, the D-E55 also gives you the greatsound Hitachi is famous for.. It's metal-tape compatible, and there's a 4-position tape selector switch to get excellent performance with any find of tape. Dual 12-LED peak level indicators permit accurate setting of recording levels.

Microcomputer Control

Conventional tape decks use mechanical linkages to engage the mechanism when you push the transport controls. These can eventually cause alignment problems, particularly if too much force is used. Also, a mistake in operation such as pushing fast forward instead of stop when  the tape is rewinding is liable to stretch the tape or damage the transport. The D-E55's microcomputer control ends thaes problems by intelligently managing all functions, gliding the transport into position at the proper time with just the right amount of force. What's more, all controls are feather-touch and can be switched directly from mode to mode without the need to push the stop button. The microprocessor also controls a variety of automatic functions.

Computerized Memory Rewind

Unlike ordinary memory rewind systems which rely on the tape counter to specify the desired stopping point on the tape, the D-E55 system uses the microcomputer to memorize the position of the tape when the Play button is pressed, allowing to rewind to the that point at any time. When the Memory rewind Play mode is selected, the tape begins to play after being rewound, very convenient for listening to a particular selection a number of times. Memory rewind is also a big help when recording; to re-recorded after having made a mistake, use memory rewind stop to return to the exact position you started at.

Auto Rewind Play/Stop

This handly feature adds a lot to operating convenience. In the Stop mode, the tape is automatically rewound when the end is reached and the transport is shut off- no need to waste time rewinding it later. In the play mode, the tape is automatically rewound at the end, the Play function is re-initiated so you hear the same side again until you stop it manually - ideal for continuous background music.

Auto Rec Mute

Still another feature made possible by the microcomputer, Auto Rec Mute makes taping easier and gives better results. One touch of the Rec Mute button and a 4-second section of blank tape is automatically made, the ideal waay to place intervals of silence between the selections on your tape. Intervals other than 4 seconds may also be made by using the pause button in combination qith the Rec Mute button. The pause indicator flashes once a second to help measure the exact time desired.

LED peak Meters

Instead of the usual machanical VU or peak meters, the D-E55 offers dual 12-LED peak indicators driven by advanced digital circuitry. Since there are no moving parts,, these meters do not suffer from delay or overshoot like their mechanical counterparts, and therefore provide accurate, instantaneous visual monitoring of signal levels.

You'll really appreciate how easy these meters make it to set precise record levels for top-quality recordings.

4-position Tape Selector Switch

A large variety of  recording tapeare available on the market, with widely varying characteristics. It is essential that the deck be matched to the particular type of tape in use ifideal results are to be obtained. The D-E55 has switch settings for metal, CrO₂, Normal, and FeCr tapes, giving you optimum results whatever tape type you use.

Specifications

Motor:  Electronically controlled DC motor

Heads:  metal Sl record/playback head double-gap ferrite Erase head

Semiconductors:

41 Transistors ; 27 Diodes; 2 varistors; 5 LEDs; 6 ics

Track System:  4 track, 2 channel stereo

Tape:  cassette Tape C-30. C-60, C-90

Tape Speed:  4,75 cm/s

Recording System and Bias Frequncy:  AC bias, 85 Hz

Erasing System:  AC erase

Erase Ratio:  65 dB or more (at 1 kHz)

Frequency Response:

Normal :  20 Hz - 17 kHz

Cro2 :  20 Hz - 18 kHz

Metal :  20 Hz - 18 kHz

FeCr :  20 Hz - 17 kHz

Signal-to-Noise Ratio

Dolby NR Off :  59 dB (weighted A, reference 3% THD.  Metal tape)

Dolby NR On :  67 dB (weighted A, reference 3% THD. Metal Tape)

Wow and Flutter:  0,04% WRMS (0,13% DIN)

Input Sensitivity/ Impedance:

Microphone :  0,3 mV/  300 Ω - 5 kΩ

Line In :  50 mV/ 50 k Ω or more

DIN  (Rec/Pb) :  0,3 mV/3,3 k Ω

Output Level:  500 mV

Output Load Impedance:

Line Out :  50 k Ω or more

DIN (Rec/Pb):  50 k Ω or more

Headphones :  8 Ω - 2 k Ω

Distortion:  1,0% (1 kHz , -3 dB)

Crosstalk:  60 dB or more (at 1 kHz)

Channel Separation:  30 dB or more (at 1 kHz)

Power Supply:  AC 120V, 100-110 V, 115-127 V, 220-220 V, 230-240 V, 50/60 Hz

Power Consumption:  21 W

Dimensions (W x H x D):  435 x 110 x 266 mm

Weight:  4,6 kg

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Hitachi FT-440 tuner

 Hitachi model FT-440 AM/FM Stereo Tuner

Specifications:

Circuitry:  AM/FM 2-band stereo tuner

Semiconductors:  12 Transisors; 1 FED; 2 ICs; 23 Diodes; 2 LED

FM Section

Frequency Range:  88 - 108 MHz

Usable Sensitivity:  1,7 µV (IHF)

Image Rejection:  75 dB

IF Rejection:  100 dB

Distortion:

Monaural :  0,1% (400 Hz)

Stereo :  0,25% (400 Hz)

Signal-to-Noise ratio:  76 dB

Selectivity:  80 dB (±400 Hz)

Stereo Separation:  50 dB (1 kHz)

Capture Ratio:  1,0 dB

Antenna Input Impedance:  300 Ω balanced type; 75 Ω unbalanced type

AM Section

Frequency Range:  530 - 1,605 kHz

Usable Sensitivity:  12 µV (IHF), 250 µV/m (bar antenne)

Image Rejection:  45 dB (1000 kHz)

IF Rejection:  388 dB

Selectivity:  34 dB (±10 kHz)

Signal-to-Noise Ratio:  45 dB

Output Voltage:

AM :  0 -165 mV (variable) [400 Hz, 30% modulation]

FM :  0 - 550 mV (variable [400 Hz, 100% modulation]

Power Requirements:  AC 120 V 60 Hz or 110 V, 120 V, 220 V, 240 V 50/60 Hz

Power Consumption:  12 W

Dimensions (W x H x D):  435 x 166 x 377 mm

Weight:  7 kg (15,4 lbs)

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