Pioneer TX-7500 AM/FM Stereo Tuner, 1975-1977, Made in Japan



Link: hifiengine

Description

The Pioneer TX-7500 is a functional style stereo AM/FM tuner with twin meters, multiplex noise filter and PLL stereo FM demodulator.


This little brother of the TX-9500 is a good tuner in its own right, according to our contributor Bill Ammons. The 4-gang TX-7500 has a similar front end to that of the TX-8500II. The TX-7500's single-bandwidth IF stage consists of 3 ceramic filters and one gain stage. The FM quad chip is an HA1137 which is followed by an HA1156 stereo demod chip. The audio output is discrete. The AM section uses an HA1138 chip. Bill adds, "The higher Q design of the RF front end allows better operation in strong signal environments. The construction of the unit makes it very easy to service and modify. The TX-7500 and TX-8500II have many similar parts. I modified the TX-7500 with two IF FILTER ADDER PCB (TM) boards. This brought the IF ceramic filter count up to 5, and added two gain stages for a total of 3. When modified, the TX-7500 is just as sensitive as a TX-8500II." The TX-7500's back pamel includes fixed and variable audio outputs, multipath outputs for a oscilloscope, and a switch to change the de-emphasis. fmtunerinfo


Specifications
Type: Mono/Stereo Tuner
Tuning Bands: FM, MW
Tuning Scale: Analogue
FM Tuning Range: 87.5 to 108 MHz
MW Tuning Range: 525 to 1605 kHz
Sensitivity: 1.4uV (FM)
Signal to Noise Ratio: 68dB (FM), 50dB (MW)
Distortion: 0.3% (FM)
Frequency response: 20Hz to 15kHz (FM)
Output: 650mV
Dimensions: 420 x 150 x 365mm
Weight: 8kg