DIATONE DA-F750

Commentary

The IF stage employs three 6-pole phase linear filters with flat group delay characteristics over the 400 kHz band, and is driven by an 8-stage differential amplifier.
These filters are expected to outperform linear-phase ceramic filters, achieve a low distortion rate close to that of an audio amplifier, and have improved stereo separation and other features that are important for improving tuner sound quality.
In addition, a newly developed low-noise transistor and a ripple-free low-voltage circuit are employed to achieve low noise.

A low-noise dual-gate MOS FET is used for the RF stage and mixer stage, and the applied voltage is 14 V, so it is designed to be resistant to strong electric fields.
The wide linear range of the FET and the high selectivity of the RF amplifier stage greatly improve the interference rejection capability such as spurious response and intermodulation interference (three signal) characteristics.

A PLL demodulation IC is used for the multi-circuit.

Uses 3-pole Chebyshev type carrier leak filter.

Model Rating

Type	FM/AM Tuner
FM Tuner Section
Antenna	300 Ω balanced, 75 Ω unbalanced
Practical sensitivity	1.6 μ V (IHF)
Effective selectivity	70dB(IHF)
Capture ratio	1.0dB
Image interference ratio	90dB
IF interference ratio	100dB
Spurious interference ratio	100dB
S/N	mono:75dB stereo:70dB
AM suppression ratio	55dB
Harmonic distortion factor (100% modulation)	mono:0.08% stereo:0.1%
Separation	45dB(1kHz) 40dB(10kHz)
Muting	2-stage switching
MPX Noise Filter	2-stage switching
<AM Tuner Section>
Antenna	Ferrite bar antenna
Practical sensitivity (IHF, bar antenna)	50dB/m
Selectivity	30 dB (± 10 kHz)
Image interference ratio	70dB
S/N	55dB
<General>
Output	FIXED:150mV VARIABLE : 0 ~ 700 mV
Pwer	AC100V 50Hz/60Hz
Power consumption	14W
External dimensions	Width 425x Height 148x Depth 386 mm
Weight	8.5kg