Seoum | Lenco R-25 Fm/AM Stereo Receiver, 1976-1979, made in Korea

 

Link: hifi-wiki | resus.ch | Service Manual [PDF]

South-Korean OEM Manufacturer Seoum was the company that the Lenco R 25 Receiver developed and produced in 1976 and 1977. When they arrived in Burgdorf they went through their final check where it got its Lenco sticker on the rear side of the unit.  Swiss distributor ExLibris sold it for CHF 480

Оригинальными для оконечного усилителя являются транзисторы: 4 x Toshiba T526, но об этом чуть ниже... К сожалению схема в мелочах не соответствует с действительностью.

Manufacturer: Lenco , Switzerland
Model: R25
Type: Receiver
Years of construction: 1976 - 1979
Made in: Korea
New price approx.: 800 DM

Specifications:
Verstärker-Teil
Sinusleistung an 4 Ohm: 2X25W
Musikleistung an 4 Ohm: 2X45W
Klirrfaktor bei 1 kHz, beide
Kanäle gleichzeitig aus gesteuert auf 20W: 0.5%
Frequenzgang: 10 bis 40000 Hz
Leistungsbandbreite: 20 bis 20000 Hz
Empfindlichkeit Phono: 2,5 mV an 50 Ohm
Entzerrung Phono: RIAA ±1,5 dB
Empfindlichkeit Mikrophon: 2,5 mV an 50 Ohm
Empfindlichkeit AUX, TAPE: 160 mV an 50 Ohm
Höhenregler: +10 dB bei 10 kHz
Tiefenregler: +10 dB bei 100 Hz

Physiologische:
Lautstärkeregelung:
+ 7 dB bei 100 Hz
+ 4 dB bei 10 kHz
Geräuschspannungsabstand:
nach DIN
- Phono: > 60 dB
- AUX, TAPE: > 62 dB
Übersprechdämpfung
> 52 dB bei 1 kHz
> 33 dB bei 10 kHz

FM-Teil:
Antennenanschlüsse:
- 240-300 Ohm Sym.
- 60-75 Ohm Sym.
Empfangsbereich: 87,5-108 MHz
Empfindlichkeit mono, 60 Ohm Eingang:
20 dB S/N, f= 40kHz 1,0 μV
26 dB S/N, f= 40kHz 1,8 μV
Empfindlichkeit (mono, 60 Ohm Eingang 26 dB S/N, f= 40kHz): 1,8 μV
Begrenzereinsatz: 1,5 μV
Klirrfaktor mono: < 0,2%
Fremdspannungsabstand (mono, Eingang 1 mV): >55 dB
Gleichwellenselektion: 1,5 dB
ZF-Unterdrückung: > 90 dB
Spiegelfrequenzfestigkeit: > 80 dB
Frequenzgang: 20 bis 16 000 Hz
Stereo-Kanaltrennung: > 40 dB
Stereo-Schwelle: 5 μV

AM-Teil:
Frequenzbereich MW: 525-1650 kHz
Empfindlichkeit (S/N 20 dB): 20 uV Ant.-Eingang
Klirrfaktor: < 2%
Spiegelfrequenzfestigkeit: > 45 dB
Fremdspannungsabstand: > 45 dB

Allgemeine Daten:
Stromaufnahme: 150 VA max.
Abmessungen: 490x390x132 mm
Gewicht 11 kg

TEC (Mitsubishi) Sound System 1003 Integrated Stereo Amplifier System 1000 / TEC System 3003 29/0429/04, 1975-1978, made in Japan

Link: radiomuseum | radiomuseum | hifi-archiv | hifi-forum

Оконечный усилитель собран на: Toshiba 2SB557 & Toshiba 2SD427

Weight: 8 кг
Dimensions (WxHxD): 402 x 100 (105 mm с ножками) x 255 mm (278 mm с рэковыми креплениями)

Насадки на потенциометры: цельнометаллические

Разбор полетов: hifi-forum

TEC - Mitsubishi, схемотехника TEC System 3003

Очередной усилитель попал под расдачу:

Toshiba Transistor [Original, vintage]

• Toshiba 2SA679 - 1 pcs
• Toshiba 2SC1079 - 1 pcs
• Toshiba 2SD371 - 1 pcs
• Toshiba 2SB531 - 1 pcs

Toshiba SA-520 AM/FM Stereo Receiver, 1976-1977, made in Japan

Link: hifiengine | radiomuseum

Country: Japan
Manufacturer / Brand: Toshiba Corporation; Tokyo
alternative name Shibaura Engineering Works
Brand Tokyo Shibaura
Year: 1977

Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors: 6 x FET, 2 x IC, 42 x transistors, 24 x diodes, 3 x zener diodes

Tuning range: FM, MW
Power output: 35 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 40kHz
Total harmonic distortion: 0.4%
Damping factor: 45
Input sensitivity: 2.5mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 70dB (MM), 90dB (line)
Output: 150mV (line), 30mV (DIN)
Main principle Super-Heterodyne (Super in general)
Wave bands Broadcast (BC) and FM or UHF.
Details
Power type and voltage Alternating Current supply (AC) / 220 Volt
Loudspeaker - This model requires external speaker(s).
Power out 74 W (unknown quality)
Model: SA-520 - Toshiba Corporation; Tokyo
Material Metal case
Shape Book-shelf unit.
Dimensions (WHD) 530 x 158 x 435 mm / 20.9 x 6.2 x 17.1 inch
Notes

• ICs: 2
• AM/FM-Stereo-Receiver mit 2× 37 Watt (Sinus) an 4 Ohm. 

Net weight (2.2 lb = 1 kg) 18.5 kg / 40 lb 12 oz (40.749 lb) [17 kg]

Downloadsservice manual

Toshiba SB-220 Stereo Integrated Amplifier, 1977, made in Japan

Link: hifiengine | hifi-studio

собран на 2sb8595

Specifications
Power output: 22 watts per channel into 8Ω (stereo)
Frequency response: 15Hz to 50kHz
Total harmonic distortion: 0.8%
Damping factor: 30
Input sensitivity: 2.5mV (MM), 150mV (line)
Signal to noise ratio: 66dB (MM), 80dB (line)
Output: 150mV (line)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 22 x transistors, 12 x diodes, 1 x LED
Dimensions: 400 x 126 x 312mm
Weight: 7.1kg
Year: 1977

Toshiba HR40X - 4 Channel Quadrophonic Headphones, 1973, made in Japan

 

Link: radiomuseum

You can switch it from 2 channel to 4 channel.

Covered in a mottled brown, leather type material.

Each ear plate houses have 2 speakers, which provide the balance sound, externally they are labelled left/right and front/rear.

Left plate houses the 2/4 channel switch. the cable has front/rear label too. Two plugs are all 6.3 mm phone connectors. The headphone has a adjustable headband and stop with two screws.

Country:  Japan

Manufacturer / Brand:  Toshiba Corporation; Tokyo

alternative name  

Shibaura Engineering Works

Brand Tokyo Shibaura

Year: 1973 ? Category: Loudspeaker, headphone or earphone

Wave bands - without

Details

Loudspeaker - Is a Headphone or Earphone

Power out

Model: HR40 - Toshiba Corporation; Tokyo

Material Various materials

Notes

• Quadrophonic headphones.
• 4 channel / 2 channel switcher.
• Each 2 dynamic LS systems, 20-20000Hz, 4 x 1mW
• Impedance 8 oHm

 

 

Aurex (Toshiba) Сomplete Set SC-M12 (Stereo Power Amplifier) + SY-C12 (Stereo Preamplifier) + PC-D10 (Stereo Cassette Deck) + ST-T10 (AM/FM Stereo Tuner)

Aurex (Toshiba) SC-M12 Stereo Power Amplifier hifiengine

Specifications

Power output: 30 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 45kHz

Total harmonic distortion: 0.04%

Damping factor: 30

Signal to noise ratio: 110dB

Dimensions: 257 x 106 x 208mm

Weight: 5.1kg

Downloads

M12/M12B service manual

Aurex (Toshiba) SY-C12 Stereo Preamplifier hifiengine

Specifications

Frequency response: 10Hz to 35kHz

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 90dB (MM), 92dB (line)

Output: 150mV (line), 1V (Pre out)

Dimensions: 257 x 106 x 211mm

Weight: 5.8kg

Downloads

M12/M12B service manual

Aurex (Toshiba) PC-D10 Stereo Cassette Deck hifiengine

Specifications

Type: 2-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.8 cm/s

Heads: 1 x record/playback, 1 x erase

Motor: 1 x DC servo

Tape Type: type I, Cr02, Metal

Noise Reduction: B

Frequency Response: 35Hz to 18kHz  (Metal tape)

Signal to Noise Ratio: 67dB  (dolby B)

Wow and Flutter: 0.05%

Input: 70mV (line), 0.25mV (mic)

Output: 0.4V (line)

Semiconductors: 10 x IC, 21 x transistors, 27 x diodes

Dimensions: 257 x 106 x 214mm

Weight: 3.3kg

Year: 1979

Downloads

service data (partial)

Aurex (Toshiba) ST-T10 AM/FM Stereo Tuner hifiengine

Specifications

Type: Mono/Stereo Tuner

Tuning Bands: FM, MW

Tuning Scale: Analogue

Sensitivity: 0.95uV (FM)

Signal to Noise Ratio: 72dB (FM)

Distortion: 0.3% (FM)

Selectivity: 75dB (FM)

Frequency response: 30Hz to 15kHz (FM)

Output: 600mV

Dimensions: 257 x 54 x 238mm

Weight: 1.8kg

Toshiba SB-404 (+ Toshiba HR-40X Stereo Phones) Four Channel PRE/MAIN Stereo Amplifier With Matrix Decoder, 1973-1974​, made in Japan

4-channel Integrated Amplifier which carries a four-channel decoder.

SB-404 in is equipped with a QM system decoder unit (part of the catalog had been described as RM system in place of the QM system)

In addition, SB-404S is equipped with SQ decoder as a top model.

It is equipped with a separate pre-main circuit, it can be used as a 4-channel system as it is a discrete method When you connect a 4-channel deck. It can also correspond to the CD-4 system by connecting di modulator a (SY-504).

Pre-main circuit has become a four-system independent configuration.

The transistor in the circuit I am using the Toshiba ultra-low-noise transistor 2SC1000. It has its own due to the PCT process (Perfect Crystal device of Technology), as compared to the conventional low-noise type excellent that one-third in 1 / 2,10kHz at 100Hz characteristics.

In SB-404S uses the 27 pieces of 2SC1000 in all circuit total.

It has a built-in equalizer circuit of condenser cartridge only.

This you can use the Toshiba record player SR-80C and electret type condenser cartridge C-401S series.

The power amplifier circuit I has adopted the whole page hardwired-connection OCL type of IC power pack.

It is to prevent the deterioration of the characteristics due to the coupling capacitor by all each stage direct connection type, and has improved the frequency characteristics and distortion characteristics.

When 2-channel playback is enabled the BTL connection, you can output up by the use of four of the power amplifier.

hifi-studio

Усилитель построен на базе 4 x Toshiba Power Pack TH9015S 

Toshiba AUREX XR-Z70 compact disc digital audio player

radiomuseum.org