Infrequent Sound [sex.tex] technology: сентября 2021

Akai SW-157 mk II, 1975-1979, made in Japan

Specifications
Type: 3 way, 3 driver loudspeaker system
Frequency Response: 30Hz to 20kHz
Power Handling: 30W
Recommended Amplifier: 60W (maximum)
Crossover Frequency: 1200, 5000Hz
Impedance: 8Ω
Sensitivity: 92dB
Woofer: маркировка Akai 30S-56C 7 ohm 30W - 300 mm (12") тканевый с аккуратным количеством пропитки подвес (выворотка) - магнитная система феррит

Midrange: маркировка Akai 12M-56S 8.5 ohm 3W - 1 x 120 mm (5") - магнитная система феррит

Tweeter: маркировка Akai CT-57 8 ohm 20W - 44 mm (1 3/4") - магнитная система феррит

Enclosure: bass reflex
Finish: walnut
Dimensions: 385 x 660 x 290mm
Weight: 16.4kg

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Akai AM-2450 Stereo Integrated Amplifier, 1979-1980, made in Japan

Link: hifiengine

Specifications
Power output: 45 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 60kHz
Total harmonic distortion: 0.1%
Damping factor: 30
Input sensitivity: 3mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 75dB (MM), 95dB (line)
Channel separation: 55dB (MM)
Output: 150mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 27 x transistors, 17 x diodes, 4 x IC
Dimensions: 440 x 144 x 345mm
Weight: 9.9kg
Finish: black, silver

Downloads
service manual

Related Catalogues
Innovation

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Sennheiser Miart 71 crystal cubic accessories, 100% hand made in Korea

Link: ???

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Art HeadAMP V – Five-Channel Headphone Mixer/Amplifier, 2007, made in China

Link: artproaudio | Owner's Manual

Specifications
Maximum Input Level +18dBV
Input Impedance 10k Ω
Maximum Gain 26dB/channel
Output Impedance 10 Ω
Signal To Noise Ratio > 90dB
Total Harmonic Distortion <.008%
IMD (SMPTE) <.008%
Maximum Output Power 300mW/channel
Dimensions 7.5×4.75×1.25 inches (190mm x 123mm x 30mm)
Weight 5lb (227g)
Power Requirements 12VDC

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Tweeter 022-1130-009 137 7211N 3.3/4", 1970-1973, made in USA

Такие ВЧ устанавливались в: Marantz, Martin Lab, Bose, H.H. Scott, RTR, Ohm, KLH, EPI и многих многих многих американских аудио-системах 70-80хх годов, как с фенольным кольцом так и без него.

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Bang & Olufsen (B&O) Beovox HT 2700 Type 6232, 1972, made in Denmark

Link: beo.zone | radiomuseum | beoworld

In 1972 the Museum of Modern Art in New York (MoMA) chose seven Bang & Olufsen products designed by Jacob Jensen to be included in their Design Collection as representing excellent examples of the Museum's criteria for quality and historical importance; design, in fact, which had influenced the twentieth century. Beovox 2700 were one of those seven products. That same year Beovox 2700 won the iF Design Award.

Country Denmark
Manufacturer / Brand Bang & Olufsen (B&O); Struer
Year 1971 - 1972
Designer: Jacob Jensen
Category Loudspeaker, headphone or earphoneWave bands- without
Power type and voltage No Power needed
Loudspeaker 2 Loudspeakers
Material Wooden case
Model: Beovox 2700 6232 - Bang & Olufsen B&O; Struer
Shape Book-shelf unit.
Dimensions (WHD) 205 x 410 x 205 mm / 8.1 x 16.1 x 8.1 inch
Notes
- Impedance (ohms): 4
- RMS load (W): 20
- Music load (W): 30
- Frequency response (Hz): 45-20
- Harmonic distortion (%): 2
- Sensitivity (W): 3,5
- Cabinet volume (Litres): 12
- Dispersion (degrees angle): 120
- Bass unit: 17,8cm Seas 4 Ohm AlNiCo
- Treble unit: 38mm dome Beovox Dome Tweeter 8480080 Important note: Two different SEAS 87H drivers was used by B&O (3 ohm and 6 ohm).
- Crossovers ((Hz): 3K
Net weight (2.2 lb = 1 kg) 5.5 kg / 12 lb 1.8 oz (12.115 lb)
Source of data -- Original-techn. papers.

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Philips Philicorda type 22 gm 751/22T Orgue Electronique, 1966-1969, made in Germany

Link: combo-organ | wikipedia | forum.vintagesynth

Introduced around 1966 or '67, the GM751 was the successor to the AG-7500. Early versions of the 751 had tube preamps, and later ones were all-transistor. Has a switch underneath that turns the internal speakers of and on.

The Philicorda 751 (22GM751 with various country specific suffixes such as 22GM751/22 for Germany) was launched in 1967, some of them had both valves (preamp stage) and transistors, followed by the 22GM752, which was fully transistorized. A later model, the 22GM753, launched at the end of 1967, was designed for the stage and was fully transistorized.

Although Philicordas, from the AG7400 to the 22GM753, had slight differences in sound, the Philicorda's typical warm tone, produced using cold cathode tube oscillators, was consistent over the years.

AG7500 (original model released in 1963)

The most completely genuine tube-philicorda, using tube oscillators, preamps and amplification throughout. Neon-bulb dividers. The amp/speakers (AG7600) came in a separate rectangular wooden cabinet with a spring reverb unit contained in a plastic box under the case.

GM751 (released in 1966)

Re-design front panel, slightly larger case. The amp/speakers
are now mounted inside the organ case.
There were at least three different (sub-) versions of this model (though they were identical in appearance).
The first of these utilized tube oscillators, pre-amps & vibrato circuits and a mix of neon dividers and transistors for divide-down.
The biggest change came with the second version which except for the tube pre-amps/vibrato circuits used transistor oscillators and dividers
Finally the third and final version (introduced around 1968/69) was all-transistorized.

GM752 (unsure about the release date)

The GM752 was basically a fully transistorized 751 with 1-piece rocker switches instead of 2-piece push-buttons as used on earlier models.
Provided with an extra outlet for connection to an optional Philips rotating speaker cabinet.

GM 753 "portable" (re-marketed as the "Penncrest" by J.C. Penney in the US and "Porta-Belle" in Sweden), circa 1968.

A sleeker more portable version of the GM751 without the amp/speaker.
Similar tube-preamp as the early 751 (though some units appear to have used transistor amps), case covered in blue tolex.
2-tone control panel and a cover that goes over the keyboard
from the front, tiltable metal stand that looks like 2 upside-down
metal V's.

GM754 (the last version of the portable Philicorda, introduced in 1972/73)

Re-designed front panel (now slanting): 4 horizontal sliders in place of the usual knobs.
Slightly flatter wooden case w/ metal cheekblocks. This model uses IC dividers and therefore does not sound quite as warm and organic as the older models.