Pioneer TX-710 (1980–1981)
An AM/FM stereo tuner from Pioneer's early 1980s lineup, built with MOS FET and IC technology for high selectivity and low distortion.
Overview
The Pioneer TX-710 is an AM/FM stereo tuner made from 1980 to 1981. It uses dual-gate MOS FETs and high-integration ICs for strong interference rejection and precise signal handling. It covers FM and AM (MW), with a digital tuning scale and separate output controls for each band. It belongs to Pioneer's Blue Line series and pairs with amplifiers like the SA-710.
Specifications
| Type | AM/FM stereo tuner |
| FM Tuner Section Circuit system | MOS FET RF1-stage, 4-series varicon 5-speed limiter quadrature detection |
| FM Practical sensitivity (IHF) | 1.9 μV |
| FM Capture Ratio (IHF) | 1dB |
| FM Effective selectivity (IHF) | 60dB |
| FM Signal-to-noise ratio | 70dB |
| FM Image Interference Ratio (82 MHz) | 85 dB or more |
| FM IF Interference Ratio (82 MHz) | 100 dB or more |
| FM Spurious interference ratio | 100 dB or more |
| FM AM suppression ratio | 55dB |
| FM Harmonic distortion factor | Mono : not more than 0.2% Stereo : not more than 0.4% |
| FM Frequency response (stereo) | 20 Hz to 15 kHz + 0.2 -2.0 dB 50 Hz to 10 kHz + 0.2-0.5 dB |
| FM Stereo separation | 1 kHz : 40 dB or more 50 Hz to 10 kHz : 30 dB or more |
| FM Carrier leak suppression ratio | 65dB |
| FM Antenna | 300 Ω Balanced Type 75 Ω Unbalanced Type |
| FM Muting | ON-OFF |
| FM MPX Noise Filter | ON-OFF |
| AM Tuner Section Circuit system | Untuned RF1-stage 2-train varicon |
| AM Practical sensitivity (IHF, bar antenna) | 300 μV/m |
| AM Practical sensitivity (IHF) | 15 μV |
| AM Selectivity | 35dB |
| AM Signal-to-noise ratio | 50dB |
| AM Image interference ratio | 45 dB or more |
| AM IF interference ratio | 55 dB or more |
| AM Antenna | Ferrite bar antenna included |
| General Output Level / Impedance | Fixed : 650mV/4.7k Ω Variable : 70 mv ~ 2V/300 Ω |
| General Semiconductor used | Transistor : 13 FET : 1 IC : 3 Diode, etc. : 8 pcs |
| General Power supply voltage | 100 VAC, 50Hz/60Hz |
| General Power outlet | Power switch not linked : 1 system |
| General Power consumption | 25W |
| General External dimensions | Width 430x Height 138x Depth 345 mm |
| General Weight | 7.7kg |
Design
The front end uses a dual-gate MOS FET with a 4-series frequency linear varicon. That cuts cross modulation and improves interference rejection. The IF section has a proprietary high-density IC and a 5-stage limiter. A phase-linear ceramic filter handles selectivity, and quadrature detection keeps distortion low. The MPX section uses a double-balanced differential demodulation circuit with its own IC, which improves stereo separation and reduces SCA beat interference. A sharp low-pass filter minimizes carrier leakage. The AM section has a dedicated IC with untuned RF amplification and a balanced mixer for better spurious characteristics, plus a ceramic filter for sharp IF selectivity. The signal meter uses a limiter-stage level detector for better linearity. There are two output terminals - fixed and variable - with independent level controls for FM and AM. An FM muting circuit reduces tuning noise, and an MPX noise filter suppresses broadcast noise without affecting sound quality. A multi-path terminal connects to an SD-100 or an oscilloscope for antenna alignment.
Context
The TX-710 is part of the Blue Line series and pairs with the SA-710 amplifier. It shares its design with the TX-710L, but the standard TX-710 has no longwave (LW) reception.
Market
Listed prices in Japan as of April 18, 2026, range from ¥3,630 to ¥5,500. The original list price was ¥43,000 around 1973, though production ran from 1980 to 1981. The German list price was 698 DM.
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