GPM 8020 AM-FM Stereo Tuner, 1970s, made in Korea

Link: 

Apple Mac Mini Mid-2010 MC270LL/A Macmini4,1 A1347 [Core 2 Duo 2.4 GHz / 8 Gb Ram / HDD 320 GB], 2010-2011, made in China

Link: everymac

TC Electronic Level Pilot X Passive Volume Controller, 2008, made in China

Link: tcelectronic | How to fix TC Electronic Level Pilot static noise | Bourns potentiometer and its complete reference is PTD904-1020K-A103

High-resolution Analogue Volume Control Level Pilot puts immediate level control exactly where you need it - right at your fingertips. It does this by using a renowned Bourns potentiometer to ensure accurate, high-resolution analog control over your monitors at all times. Most audio interfaces, digital mixers and other digital audio devices are restricted to digital attenuation of the output signal, reducing the digital-to-analog converter resolution, ultimately rendering a poorer output sound quality. Using Level Pilot as your analog level control after the DAW guarantees sonic integrity of your audio signal while keeping level control right there at your fingertips.

Exceptional Clarity in the Signal Path Level Pilot uses components and circuitry that optimize signal-to-noise ratios. There are no buffers, batteries, transistors or other tone-sucking components in there - so all that comes out of it are pristine, high-fidelity audio signals.

Compact, Sleek and Sturdy Design Level Pilot not only feels like a level control that you can rely on in any situation, it also comes with a brushed aluminum finish to give it a premium look and a smooth, ergonomic feel.

Computer-independent Operation Many level control solutions draw additional power from the computer to enable level attenuation - not so with Level Pilot, which can be operated completely independently of the audio source, be it computer or any other line-level device. In fact, Level Pilot requires no power to operate, guaranteeing quick and direct control over your monitors.

Balanced and Unbalanced Compatibility This makes Level Pilot a real life-saver, fitting into most of today's analog setups and allowing high quality level control in an endless number of applications.

'Slip-free' Rubberized Base Plate Level Pilot feels solid under hand, and the additional slip-free rubberized base plate ensures that Level Pilot stays exactly where it's needed.

Quad-core Fully Balanced XLR Connectivity Level Pilot comes with its own discrete quad-core cabling to ensure perfect stereo imaging and left-right tracking - with no messy cabling to clutter up your workspace.

Yamaha EOS YS-200 Digital Synthesizer 4-Operator FM Synthesizer (TX81Z), 1988, made in Japan

 

Link: muzines | vintagesynth | wikipedia | deepsonic | synthmanuals [Owner's Manual, PDF, eng] | check & replace battery

EOS= "Entertainment Operating System"

The Yamaha YS200 is a 4-operator, 8-algorithm, 8-waveform FM synthesizer. It has the same technology that powers the TX81Z and the DX11 but without the "complicated" terminology associated with FM digital sound creation, using instead variables that are easy for all musicians to understand. A cheaper YS100 is also available, lacking the sequencer and aftertouch.

The YS200 comes with an on-board, 8-track sequencer with full erase, copy, delete, insert edit features. Since the YS200 can sound up to eight different voices at once, it is possible to create very complex songs using the sequencer. An proper effect processor is also available, with 9 presets covering reverbs, delays and distortions.

Although the YS200 has the same FM engine of the TX81Z and DX11 and actually is compatible with voices coming from those synthesizers, it totally lacks the full editing abilities, allowing for a very few "easy edit" settings (EG, Tone, LFO, Name and Effect).

The YS100 and YS200 seemingly came at a time of uncertainty about what to do with the DX legacy. Yamaha was determined to solve the legendary "complexity" that plagued the DX7. An advertisement Introduced the YS family stating "The world's best-selling synthesizer had just a couple of rough edges. Now everything is smooth as silk.".

The design is "weird" to put it mildly. The controls should be "laid out in a logical fashion" but it looks more like a 1980s fever dream meets ancient stone inscriptions. The volume "disc" is probably the least used control on the panel but it's huge and doesn't even work as data entry. Frog (same designers of the TQ5 and Apple's Snow White design language) were probably tasked to make easy interfaces for the DX engine of the future but clearly failed since Yamaha quickly came back to the original layout for the SY line of synthesizers that would soon replace the DX7II.

The complexity of FM synthesis is somewhat relieved by the "Easy Edit" controls for basic editing operations, but this can also be limiting since not all parameters are accessible. Full editing of the patches requires a MIDI based patch editor, such as YSEditor, which is available for free but only for the Atari ST. Fortunately, it works on Atari ST emulators for the PC. It's worth the trouble because it allows you to load up your YS with original patches from the TX81Z and some of Yamaha's other classic 4-operator DX synths, making the YS a good way to get your hands on classic patches from several keyboards all in one box.

KrugoVox (КругоВокс) HandMade children toys | Двухголосный круговокс и круговокс на логических ИМС

Link: cxema.my1 [начало] cxema.my1 [продолжение] cxema.my1 [окончание]

Радиолюбитель №12/2010
Двухголосный круговокс и круговокс на логических ИМС. Автор - Алексей Браницкий.
Примеры звучания:
Архив
Акустика и круговокс
Круговокс 2-1
Круговокс 2-2
Круговокс на логических ИМС

Technics SB-201, 1972, made in Japan

Link: hifi-wiki

Manufacturer: Technics National
Manufactured in: Japan
Model: SB-201
Years of construction: 1972 - 1975
Colour: wooden housing
2-way 2-speakers, Closed Box
Woofer: 20 cm (8") Linear Core Type EAS-20PL63S 8 Ohm
Tweeter: 10 cm (4") Dome Tweeter EAS-10KH06SA 8 Ohm
Impedance: 8 Ohm
Maximum Input: 40 Watt
Cross Over Frequency: 2 kHz
Sound Pressure Level: 92 dB/Watt
Frequency Response: 35 Hz - 30 kHz
Resonance Frequency: 55 Hz
Dimensions (WxHxD): 310 x 523 x 260 mm
Weight: 11 kg / pcs

Apple Macintosh PlainTalk Microphone 590-0617-A, 1990, made in Japan

Link: wikipedia | Using a Plaintalk microphone for Linelevel-only Macintoshes

Country: Japan

Year: 1990

Name: Apple Macintosh PlainTalk Microphone [590-0617-A]
Model number is 590-0617-A
Features a 3.5mm jack connector

Apple produced two microphones under the product name "Apple PlainTalk Microphone". The first shipped inclusive with Macintosh LC and early Performa models, and was circular in appearance. It was designed to sit in a holder attached to the side of a CRT display, and be lifted out and held by the mouth when talking. The second model was introduced alongside the AV models in the Macintosh Quadra series in 1993 but was also sold separately. It was designed to be positioned on top of the screen and to be sensitive to sound from the front. Both models had a longer connector, the tip of which was used to provide the microphone with bias voltage.

Videoton RA 6363 S Stereo Receiver, 1984-1985, made in Hungary

 

Link: radiomuseum | vintageaudio | users.atw.hu

- >  When you touch your buttons, an electronics mutes the inputs of the power amplifiers, so there is no noise when you switch to the speakers!!! The mute function often remains ineffective due to the oxidized spring contact string built into the buttons. This also applies to the mains switch!!! < - 

Оконечный усилитель собран на: 2 x Motorola TE1819 & Motorola TE1820 (BD 243B & BD 244B)

Country: Hungary

Manufacturer / Brand: Videoton; Székesfehérvár
Year: 1984/1985
Category: Broadcast Receiver - or past WW2 Tuner
Number of Transistors: 53
Semiconductors
Main principle: Superheterodyne (common)
Wave bands: Broadcast, more than 2 SW bands plus FM or UHF.
Power type and voltage: Alternating Current supply (AC) / 220 Volt
Loudspeaker: This model requires external speaker(s).
Power out: 70 W (unknown quality)
Material: Metal case
Model: Stereo Receiver RA 6363 S - Videoton; Székesfehérvár
Shape: Book-shelf unit.
Dimensions (WHD): 440 x 115 x 240 mm / 17.3 x 4.5 x 9.4 inch

Notes:
- Frequency Response: 20Hz to 20kHz
- Distortion: 0.1%
- Speaker Impedance: 4 to 16Ω
- Input Sensitivity: 2mV (mm), 200mV (line)
Net weight (2.2 lb = 1 kg): 10 kg / 22 lb 0.4 oz (22.026 lb)
Source of data: Original-techn. papers.

Hi-Fi stereo modular radio amplifier suitable for receiving K, R1, R2, R3, VHF (66-73 and 88-104 MHz) wavebands. It contains 9 integrated circuits, 44 transistors and 42 diodes. Volume control, with balance, treble and bass controls. Includes AFC, Broadband, Noise Canceling Circuits. Includes a stereo LED and a signal strength indicator. On FM bands, 5 stations can be preset and then selected at the touch of a button. You can connect 2 stereo recorders and a magnetic turntable to its input. You can record from the radio or turntable to a tape recorder or play back between the two tape recorders. Power consumption: without control: 30 W; at full control: 130 W. 

Radio frequency data:

Antenna sensitivity:

KH: ≤ 200μV;

RH: ≤100 μV, URH mono: ≤1.9 μV;

VHF stereo: 40 μV.

Selectivity:

Wide band: KH: 36 dB; RH1: 30 dB; RH2-RH3: 28 dB.

Narrow band: KH: 18 dB; RH1: 14 dB; RH2-RH3: 12 dB. VHF: 40 dB.

Mirror selectivity:

KH: 30 dB; RH1: 14 dB;

RH2: 8 dB, R3: 4 dB; VHF: 54 dB.

KF interference ratio from antenna:

AM: 46 dB;

FM: 80 dB.

Frequency transmission:

in the AM band: 100-2,200 Hz (narrow band); 100-4,500 Hz (wideband);

On the FM band: 50-15,000 Hz (-3 dB).

Harmonic distortion in the FM band: ≤1%.

Signal-to-noise ratio:

AM band: ≥45 dB;

On the FM band: ≥55 dB.

Sound attenuation in FM band for stereo reception:

1 kHz: ≥30 dB;

At 10 kHz: ≥20 dB.

Pilot suppression: ≥46 dB.

Demodulation distortion:

on the AM band: 3%;

On the FM band: mono 1%; stereo: 1.5%.

AM signal suppression in the FM band: 38 dB.

Auxiliary suppression: ≥56 dB.

Effect of the noise canceling switch in the FM band: ≥40 dB. 

Audio frequency data:

Frequency transmission:

from a tape recorder ± 1.5 dB at 10-40,000 Hz;

from a magnetic turntable at ± 2 dB: 40-30,000 Hz .

Signal-to-noise ratio:

tape input: ≥52 dB;

magnetic pickup input: ≥46 dB.

Hearing attenuation:

≥40 dB (1 kHz);

≥30 dB (10 kHz).

Intermodulation distortion:0.2%.

Power bandwidth: 40-20,000 Hz.

Harmonic distortion:

measured from high level inputs 0.5 V, 1 kHz: 0.1%;

measured from low level input 5 mV, 1 kHz: 0.15%.

Output power: 2x25 W sine, 2x35 W music.

Launched in 1983, the RT-302 is a small Hi-Fi tower radio amplifier. Akai AP-D 210 / C turntable, Akai CS-F 210 tape recorder, DC 2050 Espeakers, SA-7 stand belonged to the second generation tower. - >  When you touch your buttons, an electronics mutes the inputs of the power amplifiers, so there is no noise when you switch to the speakers!!! < - The transistors were originally Motorola TE1819 and TE1820, which are equivalent to BD 243B, BD 244B. Its predecessor was the RA 6360 S, compared to which the exterior and electronics were modified at several points. Externally, the power switch has changed from a round button to a square one, the upper half of which is just an ornament, fixed. The field strength indicator Deprez has been replaced by a series of LEDs. The round LEDs for tuning and stereo reception have changed to square. Unlike its predecessor, it requires a minimum of 8 ohm speakers.
It was very popular in an age when the buyer had little choice but to listen to a little more demanding music in exchange for a reasonable amount of money. Many of the copies produced have survived the vicissitudes of a changing time and are still more or less successful. However, the model has some type errors. The input stage receives a signal that is too large, causing the output waveform to squared at 2/3 volume. The loudness function cannot be turned off. Due to the excessive depth of the physiological volume control, it produces a powerful sound even at low volumes, which not all neighbors like. - > The mute function often remains ineffective due to the oxidized spring contact string built into the buttons. This also applies to the mains switch!!! < - Another source of error is the BF 244 A type FET on the output stage modules, which is directly at its input. Later, the factory realized this fault and modified the circuit for later types with a different transistor or a resistor. But the transistors BC 337-25 and BC 327-25 for the mute circuit on the control module may also be faulty. However, the mumus has become the tuning FM tuner (and also for the models where this module is used). Numerous theories and attempts have been made to solve the problem, from the senseless replacement of trimmers to the stabilized setting of the required supply voltages to the replacement of the operational amplifier. The factory was also trying to fix the bug. It changed the values ​​of some resistors and trimmers on FM modules manufactured after 1986. These are less prone to attenuation. There is no universal solution. Before repairing, it is advisable to check that the specified voltages are present at all. The specimen shown here keeps the taxes stable, its outputs are repair-free.