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. It was first listed in February 1993. It covers FM, medium wave (MW), and long wave (LW), with precise tuning steps and strong interference rejection. It was designed for high-fidelity audio systems and uses a quartz synthesizer tuning system and a Class AA audio output amplifier. An auto IF selector adjusts the bandwidth to suit signal conditions, which helps both sensitivity and sound quality. A Local/DX switch keeps the front end from overloading 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 auto IF selector narrows the IF band when interference is strong, which favors sensitivity. In clean conditions it widens the band for better sound quality. The Local/DX switch attenuates strong incoming signals, so the front end doesn't saturate near transmission stations. The audio output stage is a Class AA circuit, and the FM signal strength display moves in 2 dB steps. The ST-GT550 also supports AM stereo and is built as a quartz synthesizer tuner.
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