Audio Database

TU - α 307
Commentary

Synthesizer FM/AM tuner that adopts S. L. C. P circuit, etc.

A unique S. L. C. P (super linear charge pump) circuit is used in the 4-train front part.
This is a circuit in which the loop filter part of the PLL circuit is used as a high-gain amplifier of the FET input. It lowers the drive impedance of the tuning varicap and increases the linearity and the loop gain of the PLL circuit.
By adopting this circuit, high interference rejection capability is obtained even at high input power.

The Local/DX switching method is adopted to respond to various radio wave conditions from weak radio wave areas to strong radio wave areas.
In addition, the group delay coil accurately reduces stereo distortion and realizes natural and high-quality stereo reproduction capability.

It is equipped with SCMS (Station Call Memory System) which can store and directly call up the station code and original station name.
Words of up to 4 digits can be freely created using 47 kinds of characters such as alphabets and numbers, and original call keywords for each broadcasting station can be set and stored in memory.

A total of 30 FM/AM stations can be stored in memory by using 10 keys on the front panel.
This makes it possible to quickly call the station you want to receive at any time with the ease of one touch. In addition, the preset scan function allows you to quickly find the station you want to listen to by searching for a preset station twice for four seconds within each FM/AM band.

A newly developed board with excellent vibration damping and insulation characteristics is used.

Model Rating
Type FM/AM Tuner
FM Tuner Section
Practical sensitivity 11.2dBf
SN50dB Sensitivity mono:18.0dBf
stereo:38.0dBf
Practical selectivity 65dB(400Hz)
Signal-to-noise ratio mono:82dB
stereo:75dB
Distortion Factor (1 kHz) mono:0.03%
stereo:0.04%
Separation (1 kHz) 50dB
Image interference ratio 45dB
Spurious interference ratio 75dB
IF interference ratio 80dB
Antenna impedance 75 Ω
ATT level (at local switching) 12dB
<AM Tuner Section>
Practical sensitivity 50dB/m
Signal-to-noise ratio 50dB
Distortion factor Not more than 0.4%
<General>
Output voltage 0.775V/2.2k Ω
Rated power consumption 8W
External dimensions Width 430x Height 60x Depth 257 mm
Weight 2.8kg