Audio Database

The

Accuphase T-107
99,800 yen(July, 1985 release)

Description
 
The synthesizer FM stereo tuner which supplied various technology, such as the newest PLL electronic tuning circuit and an original DGL wave detector adapting the delay time of the high-speed logic IC, and was developed.

The alignment for tuning can be united with the signal of choice in ±0.002% of accuracy with a crystal oscillator, most gaps by time or a temperature change cannot be found, and it locks in the heavens of the distorted minimum and sensitivity highest.
Moreover, the digital display of frequency has adopted the static system which noise does not generate.

12-game memory tuning and automatic action-of-time-base tuning are possible for tuning.
If the memory of the favorite FM broadcast office can be carried out to 12 games by a memory and also the manual (Manual) button is pushed, free frequency can be chosen with an alignment button.
If manual tuning step-aligns and it continues pushing by one-touch, it can carry out variable [ of the alignment frequency ] at high speed. Moreover, if the automatic (Auto) button is pushed, it will stop automatically with an alignment button in an adjoining office.

An input and magnification interstage serve as double alignment, respectively, and the front end part has improved sharply the interference (RF inter-modulation) by the disturbance wave of the Dainyuu power.

By combining especially the newly developed DGL wave detector and the selected group delay flat IF filter, the characteristic which was excellent in few stable and distorted capture ratios has been acquired.
A DGL detection system should make this 19-piece series paying attention to the delay time of the output of a high-speed logic IC, and the distorted minimum and S/N should become best,The phase angle was delayed 114 degrees, this delay signal and incoming signal were applied to the exclusive OR circuit, the electric potential between two signals was chosen, the circuit was opened and closed, the degree of roughness and fineness of the signal wave produced by abnormal conditions was detected in digital one, and the audio signal is taken out. The linear region of a delay circuit is very as large as ±5MHz, and, moreover, the differentiation profit straight line characteristic of it having been stable and having excelled is acquired for a non-equalization circuit.
Moreover, IF filter carries 2 sets, Normal and Narrow, and when contiguity interference is intense, sharp reception of selection degree importance can be performed by changing to Narrow.

Using the pilot signal for a synchronization included in the stereo recovery part incoming signal, by the PLL circuit, the internal oscillating circuit was locked (fixation) and the exact 38kHz switching signal has been acquired.
In further T-107, the new system which combined the positive/negative variable reactive circuit controllable on control voltage with the ceramic resonance child is adopted as the internal oscillating circuit of this PLL. For this reason, since an exact switching signal is acquired in the lock frequency range narrower than before,No adjusting-ization of a stereo recovery circuit is realized, and maintenance of the initial characteristic can be performed over a long period of time, and also there is almost no change of the separation rate by change of temperature, change of line voltage, etc., and since the lock frequency range is much narrower than before, the merit of the beat distortion in high frequency decreasing has been obtained.

With a changeover switch, the meter can do the check of an incoming signal level and a multipass.
If an incoming signal level goes into a dBf Direct-reading scale and, as for a multipass, a meter guide goes into the range of a clear mark, it will indicate that it has received the good electric wave by the multipass minimum.

The noise filter which reduces the noise of the weak stereo office of an electric wave, the music switch which removes the noise between offices, the output level control which can unite a loudness level of sound with other program sauce, etc. are carried.

T-107 of champagne gold and T-107of black B had a color of the front panel.

The cabinet of natural rosewood finishing was an option.

At
Internal
Each

Rating of a mode
Form Synthesizer FM tuner
<Monophonic characteristic>
Received frequency 76.0MHz - 90.0MHz
Practical speed 11dBf(IHF)
S/N 50dB sensitivity 17dBf(IHF)
Standing-wave ratio 1.5
S/N (80dBf input, A compensation) 90dB
THD
(at the time of 80dBf input, ±75kHz deflection, and Normal)
20Hz:0.04%
1kHz:0.04%
10kHz:0.04%
IM distortion (80dBf input, ±75kHz deflection) 0.01%
Frequency response 10Hz-16000Hz+0 -1.0 dB
The degree (IHF) of 2 signal selection
Disturbance wave Normal Narrow
400kHz 70dB 100dB
300kHz 30dB 80dB
200kHz 8dB 30dB
Capture ratio 1.5dB
RF inter-modulation 80dB
Spurious disturbance ratio 100dB
Image ratio 120dB
AM oppression ratio (65dBf input) 80dB
Subcarrier oppression ratio 70dB
SCA disturbance ratio 80dB
Output voltage (±75kHz deflection) 1.0V
<Stereo characteristic>
Sensitivity (IHF) S/N 40dB:29dBf
S/N 50dB:37dBf
S/N (80dBf input, A compensation) 85dB
THD
(at the time of 80dBf input, ±75kHz deflection, and Normal)
20Hz:0.04%
1kHz:0.04%
10kHz:0.08%
IM distortion (80dBf input, ±75kHz deflection) 0.03%
Frequency response 10Hz-16000Hz+0 -1.0 dB
Stereo separation 100Hz:50dB
1kHz:50dB
10kHz:40dB
Stereo change inlet pressure 20dBf
<Synthesis>
Antenna 75-ohm disequilibrium (with a 300-ohm balance transducer)
Alignment system The 12 Quartz synthesizer system random memory tuning
Detection system DGL system
Output load impedance Fixed output: 200ohms
Variable output: 1.25kohm (maximum)
Meter Signal strength, a multipass change type
The semiconductor used Transistor: 16 pieces
FET: Two pieces
IC: 22 pieces
Diode: 59 pieces
LED: 18 pieces
Power source AC100V, 50Hz/60Hz
Power consumption 12W
Dimensions Main part: Width 445x height 107x depth of 330mm
A-11: Width 463x height 131x depth of 338mm
Weight 5.8kg
Option Wood cabinet A-11 (16,000yen)