Technics ST-GT550 (1993)
A high-sensitivity FM/AM tuner built in Osaka, Japan, with advanced IF management for stable reception.
Overview
The Technics ST-GT550 is an FM/AM tuner made in Osaka, Japan, first listed in February 1993. It supports FM, medium wave (MW), and long wave (LW) bands, with precise tuning steps and strong interference rejection. Designed for high-fidelity audio systems, it features a quartz synthesizer tuning system and a Class AA audio output amplifier. The tuner includes an auto IF selector that adjusts bandwidth based on signal conditions, improving both sensitivity and sound quality. It also has a Local/DX switch to prevent front-end overload in strong-signal areas.
Specifications
| FM Receiving frequency band | 76.0 MHz to 90.0 MHz (in 0.1 MHz steps) |
| FM Practical sensitivity | 14.8dBf |
| FM S/N ratio | 50 dB |
| FM sensitivity mono | 18.1dBf |
| FM sensitivity stereo | 39.2dBf |
| FM Signal-to-noise ratio mono | 78dB |
| FM Signal-to-noise ratio stereo | 72dB |
| FM Total harmonic distortion factor mono | 0.15%(normal) |
| FM Total harmonic distortion factor stereo | 0.2%(normal) |
| FM Frequency characteristic | 10 Hz ~ 15 kHz + 0.5 -1.0 dB |
| FM Effective selectivity Normal | 70 dB (± 400 kHz) |
| FM Effective selectivity Super narrow | 25 dB (± 200 kHz) |
| FM Capture ratio | 1.2dB |
| FM Image Interference Ratio (83 mhz) | 50dB |
| FM IF Interference Ratio (83 MHz) | 60dB |
| FM AM suppression | 55dB |
| FM Stereo separation | 45dB(1kHz) |
| FM Leak carrier | -68dB |
| FM Antenna terminal | 75 Ω (Unbalanced Type) |
| AM Receiving frequency band | 522 kHz to 1629 kHz (9 kHz step) |
| AM Practical Sensitivity (S/N ratio 20 db) | 20 μV, 600 μV/m |
| AM Effective selectivity | 40 dB (± 9 kHz) |
| AM Image interference ratio (999 kHz) | 40dB |
| AM IF interference ratio (999 kHz) | 50dB |
| AM Stereo separation | 20dB(1kHz) |
| Output voltage | 0.6V |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 9W |
| Power consumption (Power Off) | 2.5W |
| External dimensions | Width 430x Height 92x Depth 308 mm |
| Weight | 2.9kg |
| Remote control | no |
| Color | Technics-black |
| Manufactured in | Osaka, Japan |
Design
The ST-GT550 features an auto IF selector that automatically narrows the IF band to prioritize sensitivity under strong interference and widens it for better sound quality in clean conditions. A Local/DX switch attenuates strong incoming signals to prevent front-end saturation near transmission stations. The audio output amplifier uses a Class AA circuit, and the tuner includes a 2 dB step FM signal strength display. It supports AM stereo and is built as a quartz synthesizer tuner.
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