Nikko STA-8080 Am-FM-Multiplex Stereo Receiver, 1975, made in Japan

Link: radiomuseum | elektrotanya

Оконечник собран на: NEC 2SD188 & NEC 2SA627 попарно в каждом канале.
Country:  Japan
Manufacturer / Brand:  Nikko Electric Manufacturing Co., Ltd.; Tokyo
Year: 1975 ?

Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) Semiconductors present.
Main principle Super-Heterodyne (Super in general)
Wave bands Broadcast (BC) and FM or UHF.
Power type and voltage Alternating Current supply (AC) / 220 Volt
Loudspeaker - This model requires external speaker(s).
Power out 160 W (unknown quality)
Model: STA-8080 - Nikko Electric Manufacturing
Material Wooden case
Shape Book-shelf unit.
Dimensions (WHD) 450 x 400 x 140 mm / 17.7 x 15.7 x 5.5 inch
  • Leistungsaufnahme: 290 W, Eingänge: 2x Phono (1,9 mV, 47 kOhm), 2x Band (160 mV), Reserve: (150 mV).
  • Ausgänge: 2x Band, Pre-Out, UKW Quattro, Kopfhörer (6,3mm Klinke, vorne, 200 Ohm), 2 Lautsprecherpaare (4-16 Ohm).
  • Verstärkerdauerleistung: 2x 65W an 8 Ohm, 2x 80W an 4 Ohm, Gesamtklirrfaktor: 0,1% 
Net weight (2.2 lb = 1 kg) 11 kg / 24 lb 3.7 oz (24.229 lb)
Price in first year of sale 1,499.00 DM

Saba Greencone 5898 510 002 5 Ohm [Full Range Alnico Oval 240 x 180 mm] - Open Baffle, 1955-1961, made in Germany

Link: radiomuseum

Данной моделью широкополосных GreenCone оснащались радио подобные Saba Wildbad 125.

Country:  Germany
Manufacturer / Brand:  SABA; Villingen
Brand Schwer & Söhne, GmbH
Year: 1955-1961 ??
Category: Loudspeaker, headphone or earphone
Wave bands - without
Power type and voltage No Power needed
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Impedance: 5 Ohm
Power out
Model:  5898 510 002 - SABA; Villingen
Material Various materials
Dimensions (WHD) 180 x ?? x 240 mm
Net weight (2.2 lb = 1 kg) ?? kg

Akai 4000DS mk-ii Reel to Reel tape recorder, 1973-1979, made in Japan

Link: hifiengine

The Akai 4000DS is a four-track, two-channel stereo reel to reel tape recorder for use with 7" reels.

The employment of a highly efficient induction motor and boldly designed flywheel in the 4000DS results in stable tape travel and reduced wow and flutter.

This feature coupled with a three head system including Akai's one-micron gap playback head assures clear playback sound.

Track system: 4-track, 2-channel, stereo/monaural system
Heads: 1 x record, 1 x playback, 1 x erase
Motor: 1 x SSM-1 4-pole induction
Reel size: up to 7 inch reel
Tape speeds: 3 3⁄4 7 1⁄2 ips
Wow and flutter: 0.15% (7 1⁄2 ips)
Frequency response: 30Hz to 23kHz (7 1⁄2 ips)
Signal to Noise Ratio: 50dB
Total harmonic distortion: 1.5%
Crosstalk: 50dB
Input: 70mV (line), 7mV (DIN), 0.8mV (mic)
Output: 1.228V (line), 0.4V (DIN)
Semiconductors: 11 x transistors, 4 x IC, 4 x diodes
Dimensions: 406 x 314 x 194mm
Weight: 11.4kg

mkII brochure

Philips (B&O & DUX) AD 0163 T8 dome tweeter, 1976-1978 , made in Belgium


1060 & 1063 являются лучшими из ВЧ в AD-серии
sensitivity: 92 db
классическое применение: фильтр второго порядка L = 0, 28 ; C= 2,2 mkf

Philips (B&O & DUX) AD5061/SQ8 mid-range, 1976, made in Belgium

Link: verheijde

Diffuser - paper, fabric suspension.
Cone Ø 100mm.

AD5061/SQ main difference sealed metal frame back with 680 Hz Fs
AD5061/M Midrange version with whizzer cone, probably for table radios
AD5060/W Woofer version with rubber edge and Fs = 65 Hz, large peak in FR.
Note these power differences for the AD5060/W8 vs 62 versions of the woofer:
AD5060/W8 RMS PHC = 10, Operating = 8, P. Max = 15 W
AD5062/W8 RMS PHC = 20, Operating = 8, P. Max = 40 W
More data is given for the woofer which might also apply to the SQ version:
DC resistance: 7 for 8 ohm, 3.2 for 4 ohm
Moving mass: 6 g
BL: 5
Piston diam: 87 mm
Piston area: 59 mm^2
Magnet: 230 g
Air gap height: 5 mm
VC height: 6.3
Fs: 65
Compliance: 1.25 mm/N
Vas: 5.2 liters
Qms: 3.8
Qes: .66
Qts: .56

Studer Revox Forum B mk1 3-Weg HiFi-Box, 1983-1986, made in Germany

Link: hifi-wiki | radiomuseum

  • Manufacturer: Revox
  • Model: B Forum
  • Made in: Germany
  • Color: real wood veneer walnut, dark stained
  • Dimensions: 320 x 510 x 325 mm (WxHxD)
  • Weight: 14.7 kg
  • Selling Price in Germany: 1600 DM/1983

  • Type: 3-way
    • Woofer: 260 mm
    • Midrange: 38 mm (dome)
    • Tweeter: 19 mm (dome)
  • Load (Nenn-/Musikb.) : 90/120 W
  • empfolene amplifier power: 20-100 watts (RMS per channel)
  • Distortion: 0.5%
  • Transition regions: 33-24000 Hz
  • Crossover frequencies: 820/2600 Hz
  • Level controls Mid Level at 1kHz: 14/18 dB / oct.
  • Level controls High level at 10 kHz: 24/28 dB / oct.
  • Overload Protection: Overload protection of the tweeter by fuse
  • Connection: slide clamps
  • Impedance: 4 Ohm

Altair Estradin - 231 [MiniMoog] | Альтаир Эстрадин-231, 1986, made un USSR

Link: ruskeys

Monophonic synthesizer Altaiir 231 (Estradin factory, Zhitomir city) is intended to play different sounds from the imitation of natural instruments to complicated synthesized electronic timbres, sound effects, percussion sounds & so on. There are a four-octave keyboard & a wheel to pitch control. There are also controls for parameters on the front panel, an output for phones, an input for a pedal. The instrument consists of four main blocks of sound synthesis - Generator, Mixer, Filter and Contour.

Synthesis is based on 3 master oscillators (each of them with different parameters of registers) waveform, frequency modulation. There is also a generator of white & pink noise. Low-pass filter with main parameters gives the possibility for keyboard tracking. Portamento adjustment knob is provided. To tune a pitch the tone signal is used (440Hz) It provides a linear input to connct an external sound source to Altair. Output and input sockets are 1/4" jacks


ALTAIR-231 is a Soviet Minimoog equivalent. If you are familiar with Soviet synths you might know that ESTRADIN-230 has absolutely identical schematics (all 6 PCBs) with ALTAIR-231.

ALTAIR-231 is powerful monophonic 3-OSC synthesizer produced by Elektroizmeritel, millitary radio plant in Zhitomir, USSR, 1986. Synth has 4-octave keyboard (F-C) with velocity (sensitivity assign to vibrato effect). For live performance there is a wheel which provides pitch shift. ALTAIR-231 is based on 3-VCO (OSC-3 can work as the modulator), 1 VCF (lowpass 24dB/oct) with ADSR, 1 VCA, 3 LFO, noise generator (white/pink), glide, memory. It has an EXTERNAL INPUT allowing to use FILTER and GENERATORS with OTHER INSTRUMENTS such as guitars, synths, etc! ALTAIR-231 consists of 5 main sections - OSC, MIXER, MODULATION, FILTER and AMP.

OSC 1,2,3 registers - 2", 4", 8", 16", 32", LF
OSC 1,2,3 waveshape select - triangle, saw, square, pulse, sine
OSC frequency
freq 1..3, freq 2, freq 3
linked to keyboard pitch on/off (OSC 3 ONLY as MAIN OSC)

OSC 1,2,3 on/off, level
ext input level, on/off
noise generator level, on/off
noise mode switch: white/pink MOD section:
portamento on/off, rate;
mod mixer knob: balance between modulated by OSC3 and noise, depth amount;
pitch wheel (glissando)

mod on/off
cutoff, resonance, brightness
attack, decay, sustain
keytrack on/off

attack, decay, sustain
key hold memory on/off

global section: main volume, phones volume, phones, A-440Hz tone on/off, power.
Connections: input, output, pedal input, phones.
Power supply: 220V/50Hz, 127V; fuze 0,125A

Dimensions (mm) 754x466x110 (29.6"x18.3"x4.3")
Weight: ~ 18 kg (39.68 pounds)

Teac Esoteric D-700 Multi D/A Converter DAC [Serial# 120086], 1992, made in Japan

Link: audio-heritage

Собран на: 4 x AD1862
Serial number: 120086

D / A converter paired with CD Transport P-700.

ZDII is adopted as the D / A conversion circuit.
In the case of a D / A converter, especially when the signal level or the signal level is -60 dB or less, the conversion error occurs and the resulting distortion occurs.
Distortion shaper ZDII uses a dither method to disperse and drastically reduce the conversion error of the D / A converter, realizing a significant ultra-low distortion rate. In addition, an extremely high S / N ratio has been obtained by using a unique wide area centralized (high-pass) dither. This enhances the reproducibility of minute signals and the expressive power of overtone components superimposed on large volume signals.

The 20-bit 8 times oversampling digital filter is adopted as a digital filter.
This makes it possible to use a low-pass filter with a gentle cutoff characteristic, thus improving the group delay characteristic.

The 1/16 shift 20bit4DAC is carried in the D / A conversion part.
In this DAC, the small signal emphasis type DAC of the 1/16 (digital offset) system which eliminates the MSB error originally occurring near 0V is adopted. This is reducing the 0 cross distortion which occurs when an input code passes 0V to 1/8 of the conventional system by shifting the 0V operating point of DAC by 1/16 of full scale.
Thereby, the linearity of the signal area (-18dB or less) where the music signal is concentrated is dramatically improved.

The cut core balance winding transformer is adopted as a power supply part. In this transformer, a magnetic field is canceled by dividing a winding into two equal parts and making each phase the opposite phase, and the harmful electromagnetic noise is suppressed to the minimum. In addition, because the windings are in parallel, self-inductance and DC resistance are also reduced, and excellent regulation is obtained.
Furthermore, the positive / negative independent balance power supply part which made the winding of positive power supply and negative power supply independent is constituted, and the ground potential is clarified.

Including digital transmission and analog transmission, balanced transmission is adopted for the main part.
Simultaneous transmission of not only positive-phase signals but also negative-phase signals cancels the ingress of noise into the ground line.

Not only key devices, but also audio-only parts originally developed, including capacitors and resistors, are used.
The power supply unit is equipped with a bridge rectifier circuit and employs a power supply unit capacitor equivalent to Esoteric, a reference series at the time. Furthermore, the occurrence of high-frequency noise that adversely affects sound quality is suppressed by the PCB substrate that has been subjected to double-sided shielding.

The rear panel of copper plating is adopted in order to eliminate the potential difference of the input and output which occurs at the time of D / A conversion, and the S / N ratio is eliminated about 6dB outside an audible band, and about 1dB in a band.

Yamaha RX-21 Digital Drum Machine, 1985, made in Japan

Link: muzines | synthmanuals

The giant Nippon Gakki company have just released the very cheapest drum-machine; it's designed to sit comfortably at the bottom end of the market. They now make RX-11, RX-15 and RX-21 all with basically the same intrinsic, digitally sampled drum sounds, but with different control functions. (For example, the '21', like the '15' has only a stereo output, but you get what you pay for in drum machines. Yamaha intend you to adjust the volumes between the instruments very carefully, so it can be very convincing.)

This machine has nine different voices, and 40 different pre-set patterns which are held in ROM. These can form the basis of your songs as they are, or you can alter them as much as you like and enter them into RAM (without destroying them). They'll now play in the normal way. Yamaha also thoughtfully provide several 'tacets' to spice up your patterns as well as 56 user programmable memories. RX-21 has a capacity for 100 patterns and, as with most state of the art drum machines, to avoid running short of memory you may always dump to cassette and load the digital info back in again when you need to. As you are no doubt aware, you need to join several patterns together to construct a whole song. RX-21 has this facility, of course, and will hold up to four songs with a maximum of 512 parts each.

The machine itself is wedge shaped and measures 13½" x 8" x 2" at its thickest. It's a plain, hi-tech sort of design with functional, though not over-large, rubber press buttons. To the very left of the top face is the LCD window which, as per usual, shows all the information you need to program in real or step time, and also to build patterns. Many of the functions are accomplished by pressing buttons more than once, but we'll get to this later.

All the voice buttons are set along the bottom of the machine in two rows of seven. The first two are coloured blue and show Tempo in BPMs and Level for each voice. (Both of these functions may be adjusted with the No and Yes buttons. One adds numbers while the other subtracts). Next to these we have our Accent button coloured green; when this is pressed whilst programming a volume increase will result for the voice in question. Next we have snare drum, then toms 1, 2, and 3, then bass drum, hi-hat open, hi hat closed, cymbal and finally claps. The last two buttons operate start and stop/continue. Above these are set a dozen smaller rubber buttons. These relate directly to Pattern recording, Play and Beat (ie Quantise). Next to these we find Real Time Write and Step Time Write, then Song Play and Write, then Clear and Repeat, then Cassette and Insert and finally MIDI and Delete. To the right of these are the keypad numbers in a row from 0 to 9 and then we have those Increase and Decrease buttons and that's it. Because there's only the Stereo outputs (left and right), there's not an awful lot going on round the back. There's an On/Off switch, a DC9V-12V socket for the power pack (which is supplied), a headphone socket and three DIN sockets. One for Cassette In and Out and the others for MIDI.

Hitachi HA-610 Integrated Amplifiers, 1976-1978, made in Japan

Link: hifiengine


Power output: 70 watts per channel into 8Ω (stereo)
Frequency response: 7Hz to 70kHz
Total harmonic distortion: 0.3%
Damping factor: 60
Input sensitivity: 2mV (MM), 100mV (line)
Signal to noise ratio: 70dB (MM), 90dB (line)
Output: 100mV (line), 30mV (DIN), 0.8V (Pre out)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 4 x FET, 55 x transistors, 29 x diodes
Dimensions: 435 x 144 x 388mm
Weight: 12kg
Year: 1975

service manual
instruction/owners manual