AM/FM Stereo Tuner ST-7

AM/FM Stereo Tuner ST-7; Nakamichi Co.; Tokyo (ID = 2614029) Radio AM/FM Stereo Tuner ST-7; Nakamichi Co.; Tokyo (ID = 2614030) Radio
AM/FM Stereo Tuner ST-7; Nakamichi Co.; Tokyo (ID = 2614031) Radio
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AM/FM Stereo Tuner ST-7; Nakamichi Co.; Tokyo (ID = 2614029) Radio
Nakamichi Co.; Tokyo: AM/FM Stereo Tuner ST-7 [Radio] ID = 2614029 1400x375
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For model AM/FM Stereo Tuner ST-7, Nakamichi Co.; Tokyo: auction item_293749484597 seller notjusthifi
Country:  Japan
Manufacturer / Brand:  Nakamichi Co.; Tokyo
Year: 1987–1989 Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) Semiconductors present.
Main principle PLL, Phase-locked loop
Wave bands Broadcast (BC) and FM or UHF.
Details Radio Control (+Remote Wire etc)
Power type and voltage Alternating Current supply (AC) / 120; 220; 240 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: AM/FM Stereo Tuner ST-7 - Nakamichi Co.; Tokyo
Material Metal case
Shape Book-shelf unit.
Dimensions (WHD) 435 x 63 x 289 mm / 17.1 x 2.5 x 11.4 inch

A hi-fi AM/FM stereo synthesizer tuner with a digital frequency display housed in a black metallic case. Provision for system wired remote control. With Schotz NR circuit, Memory for 16 FM and MW stations, switches for FM Mute and Mode (mono/stereo). AM loop antenna, terminals for FM and AM antennae, connection for System Remote control, RCA phono Line Output sockets with output level adjusters.

FM Section De-emph. 75µs, IF Band Wide, 300Ω antenna
Frequency Range 87.5-108.0MHz 100kHz steps
IHF Usable Sensitivity Mono 10dBf/1.7µV, Stereo 17dBf/3.9µV
50dB Quieting Sensitivity  
 Stereo with Schotz NR
28dBf/14µV, without Schotz NR 37dBf/39µV
S/N Ratio  
> 80dB (USA, Canada), > 79dB (Other)
> 76dB (USA, Canada), > 75dB (Other)
Schotz NR Improvement > 6dB
Schotz NR Active Level 19-53dBf/2.5-250µV
Hi-Blend Threshold Level 19dBf/5µV
Muting Threshold Level 20dBf/5.5µV
Frequency Response 20-15,000Hz ±1dB
THD (1kHz)  Mono < 0.06%, Stereo < 0.08%
Capture Ratio  1.9dB
Alt. Channel Selectivity (±400kHz) > 60dB (USA, Canada), > 70dB (Other)
Stereo Separation
50/55/45dB (USA, Canada)
45/50/35dB (Other)
Spurious Response Rejection > 100dB
Image Rejection > 100dB
IF Rejection > 100dB
AM Suppression > 60dB
AM Section Modulation: 400Hz, 30%
Frequency Range 520-1,710kHz 10kHz steps
Usable Sensitivity 50dBµ/m
S/N Ratio (RF input 90dBµ/m) > 48dB
THD (RF Input 90dBµ/m) < 0.4%
Selectivity (±10kHz) > 20dB
Output Level/Impedance  
 FM (1kHz, Mono, 100% Mod.)
 AM (400Hz, 30% Mod.)
0.5-2.0V (variable)/1.5kΩ
0.2-0.9V (variable)/1.6kΩ
FM Antenna Inputs 75Ω unbalanced, 300Ω balanced

Versions/Power Requirements
USA, Canada  /  120V 50/60Hz
Others  /  120, 220 or 240V AC 50/60Hz (According to country of sale)
Power Consumption: 15 W max. (USA, Canada), 16 W max. (Other)

Very similar to the Nakamichi ST-7E AM/FM Stereo Tuner and the Nakamichi ST-70 AM/FM Stereo Tuner (Japan model).

Net weight (2.2 lb = 1 kg) 4.7 kg / 10 lb 5.6 oz (10.352 lb)
Mentioned in -- Original prospect or advert (1987 and 1989 Nakamichi catalogues)
Literature/Schematics (1) - - Manufacturers Literature (Service manual ST-7 ST-7E / ST-70)
Literature/Schematics (2) - - Manufacturers Literature (Owner's manual ST-7/ST-7E)

Model page created by Howard Craven. See "Data change" for further contributors.

All listed radios etc. from Nakamichi Co.; Tokyo
Here you find 131 models, 105 with images and 13 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.