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

KS Kücke & Co Linea B530, 1980, made in Germany

Link: kuecke | kuecke Prospekt | new-hifi-classic

Linea B 530’ ist die kleinste KS-Box mit einem Dreiweg-System. Dieser Lautsprecher präsentiert weiche Mittellagen und zeichnet die Höhen sauber durch. Der 200-mm-Baßlautsprecher sorgt (in Verbindung mit einem Gehäusenettovolumen von 24,4 Liter) für eine volle Baßwiedergabe. 'Durchsichtigkeit des Klangbildes' ist als zusammenfassende Beurteilung zu nennen. Die Auslegung erlaubt eine Musikbelastbarkeit bis 100 Watt.

Подвес НЧ - каучук (встречаются варианты с текстилем). 
ВЧ и СЧ - шелк с пропиткой

Model: Linea B 530
System: Dreiweg-KS-System, Baßreflex
Impedanz: 8 Ohm
Nennbelastbarkeit: 70 (80) Watt
Musikbelastbarkeit: 100 Watt
Übergangsfrequenzen 1.000 und 7.000 Herz
Flankensteilheit: 6 dB / Oktave
Frequenzbereich 43-20.000 Hz ± 3 dB
Elektrische Leistung: 10 Watt / 8 Ohm bei entsprechender Lautstärke 83,5 dB
Baßeigenresonanz: 65 Herz
Praktische Betriebsleistung: 1,6 Watt / 8 Ohm
- 1 x 180mm Tieftöner (Membrandurchmesser 185mm, Schwingspulendurchmesser 32mm)
- 1 x 31mm Kalotten-Mittentöner (Membrandurchmesser 31mm, Spulendurchmesser 31mm)
- 1 x 26mm Hochtöner (Membrandurchmesser 25mm, Spulendurchmesser 25mm)

Gehäuseausführung: Nußbaum natur, Eiche schwarz
Frontrahmen: abnehmbar

Abmessungen: B 280, H 470, T 280 mm
Weight: 16 kg / pcs

Framus 5/156-52 Solid Body Strato Star Bass, 1960-1964, made in Germany

Link: framus-vintage | framus-vintage


  • beige, red, black, sunburst finish
  • solidbody,
  • Rosewood fingerboard
  • 1 or 2 PU, oval chrome
  • built since the beginning 60s
this particular instrument:
  • sunburst finish
  • dates 1964
  • model built until the mid 60s

SEAS 5F-HF (111050-2) 2" Vintage Tweeters, 1978, made in Norway

model: SEAS 5F-HF
impedance: 8 Ohm
code: 111050-2
year of issue: 1978
made in Norway

ITT Schaub-Lorenz 4015, 1971, made in Germany (Denmark / Norway)

The ITT 4015 employed a SEAS woofer which Troels Gravesen called a Blackcone along with a similar cone tweeter. troelsgravesen

Type: 2-way speaker system, closed box
Data according to DIN 45,500
Frequency range: 55-22,000 Hz
Power rating: 12 Watt
Music power: 25 Watt
Sensitivity: 96 db at 2.5W
Impedance: 4 ohms
Speaker Dimensions:
- Woofer / Bass: AlNiCo - Seas 17 TV-W (
year of issue 1971) - 160 mm 
- Tweeter: AlNiCo - Seas 5 TV-HF (year of issue 1971)  - 55 mm
Wooden case / Finish:natural walnut / oak
Dimensions (WHD): 210 x 350 x 220 mm
Volume: 8.6 liters
Weight: 4.3 kg

KLH model 20 twenty, 1965, made in USA

virtually identical to the well-regarded Model 17. The 17s are 8 ohm, the 20s are 4ohm (but both use the same tweeters) The 17s have binding posts, 20s have RCA jacks--they were sold as part of the Model Twenty system with TT/receiver.

НЧ - 10"

Elac 2200T High Fidelity Stereo Receiver, 1970-1971, made in Germany

Link: radiomuseum

Предварительный собран на: 2 x ATES AL103 5 OF [AD 166 | germanium transistor].
Оконечный собран на: 2 x AD 167 & 2 x ATES 2n3055 [BD 142].

Country: Germany
Manufacturer / Brand: Elac Electroacustic GmbH; Kiel
Year: 1970/1971
Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 37:
Main principle Super-Heterodyne (Super in general); ZF/IF 460/10700 kHz
Tuned circuits 6 AM circuit(s) 11 FM circuit(s)
Wave bands Broadcast, Long Wave, Short Wave plus FM or UHF.
Power type and voltage Alternating Current supply (AC) / 110-120; 220-240 Volt
Loudspeaker - This model requires external speaker(s).
Power out
Model: 2200T - Elac Electroacustic GmbH; Kiel
Material Wooden case
Shape Book-shelf unit.
Dimensions (WHD) 595 x 311 x 262 mm / 23.4 x 12.2 x 10.3 inch
  • Vollstereo, NF-Verstärker mit zwei Endstufen je 18 W (Sinus). 
Net weight (2.2 lb = 1 kg) 8 kg / 17 lb 9.9 oz (17.621 lb)
Price in first year of sale 798.00 DM