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

Transonic-Strato: A-1110 Amplifier (Seoum SA-3180B), T-1109 Tuner, D-1108 Deck

Company Transonic-Strato produced music equipment under the logo of Nikko and repeatedly reaffirmed that can create successful designs of amplifiers. Very solidly constructed with a thick aluminum front, aluminum knobs, switches with aluminum caps. In the middle of a large transformer, two powerful filter capacitors with a capacity of 10 000 uF each, the power amplifier in the form of large power transistors Japanese company Hitachi. Rated power, which has a 2 x 150 watts RMS. This power allows you to connect and control, drive even much more powerful set of speakers with an impedance of 4-16 ohms. It has a good phono stage with two separate entrances, depending on the type of inserts, and standard input Tuner, AUX 1, AUX-2, Tape 1, Tape-2.

Specifications: Rated Output Power: 2 x 150 W Connection 4 columns aluminum front panel, aluminum knobs 7 DIN audio input Built-in very good phono stage with two separate entrances depending on the type of MM and MC insert additional microphone input with mixing Special input / output RCA combined jumpers for patching the audio track of sound equalizer. Adjusting the bass and treble tones Loudness boost function, Filter lowest and highest frequencies are especially useful when listening to vinyl records headphone output good technical condition, playing on all channels, lines of LEDs in the amplifier and tuner deck and flawless shine, potentiometers and switches operate, the whole orginalna and not repaired.

Transonic-Strato A-1110 Amplifier (Seoum SA-3180B) radiomuseum (made in Germany)

Transonic-Strato T-1109 Tuner (made in Germany)

Transonic-Strato D-1108 Deck (made in Japan)