Audio Database

The

Accuphase T-106
145,000 yen(January, 1984 release)

Description
 
The FM/AM tuner in which the FM section which supplied the new technology of an electronic tuning circuit, a DGL FM wave detector, etc., and the AM section of synchronous detection were carried.

While using the crystal oscillator for alignment and being able to unite with the signal of choice in ±0.002% of accuracy, most gaps by time or a temperature change cannot be found, and it locks at the point of the distorted minimum and sensitivity highest.
The abnormal-conditions distortion or noise by external vibration do not occur for electronic tuning. Moreover, the digital display of frequency has adopted the static system which noise does not generate.

The 14-game random memory is carried, seven feather touch buttons are used for a double type, and the random memory of FM of 14 games and the AM office can be carried out to a favorite button.
Moreover, it also has the rotation knob type tuning adapting the optics of the same feeling as variable condenser type tuning, and continuation tuning can also be carried out at intervals of 100kHz (AM is every 9kHz) with pip sound.

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

The characteristic excellent in combining especially the newly developed DGL wave detector and the selected group delay flat IF filter has been acquired.
A DGL detection system is the circuit to which its attention was paid at the delay time of the output of a high-speed logic IC,It is making a high-speed logic IC into 19-piece series, delaying 114 degrees of phase angles so that the distorted minimum and S/N may become best, and applying this delay signal and incoming signal to an 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 (logical multiplication), and the audio signal is taken out. The linear region of a delay circuit is as large as ±5MHz, and since a-less equalization circuit moreover, the differentiation profit straight line characteristic of it having been stable and having excelled is acquired.
moreover, IF filter (Normal) 2 sets of (Narrow) are used, and when interference is intense, reception of selection degree importance is possible by changing to Narrow.

State-of-the-art technology is accumulated on FM stereo recovery circuit, and the outstanding characteristic has been acquired.

AM broadcast reception was also thought as important and distortion has adopted the synchronous detection which was excellent in interference removal capability few.
By making the same as that of an input subcarrier local oscillation frequency poured into a mixed vessel, a synchronous system takes out an audio signal at once, and the degree of selection is decided by the characteristic of a low-pass filter prepared in the audio circuit, and serves as an outstanding system with little detection distortion.
Furthermore, a disturbance wave can judge the low higher than receiving station frequency and frequency side, and the synchronous detection can choose Sideband. For this reason, a sky wave demonstrates power also in the area which worries about interference of the night which becomes strong, or an overseas office.
Since it added to the standard broadband super system in T-106, synchronous detection is adopted and the frequency response has given the emphasis characteristic united with the sound equalizing (pre-emphasis) characteristic of NHK,Pre-emphasis broadcast is receivable with a good frequency response.
Moreover, the beat of the adjoining office is removed with a 9kHz filter.

The state of an input electric wave can be known with the peak degree-of-modulation meter which displays the signal meter in which signal strength is shown, and a degree of modulation to 200%.
Moreover, the degree-of-modulation meter can know the direction of the antenna which serves as a multipass meter and becomes the distorted minimum by switch change.

The selectivity switch used when there are much the noise filter and interference which reduce the noise of the weak stereo office of an electric wave as an attached function,The level control which unites a level with the volume of the muting switch from which the noise between offices is removed, the side band selector which chooses AM side band at the time of interference, and other program sauce is carried.

The natural rosewood cabinet currently used for the photograph was an option.
Moreover, there is T-106B of a black model.


The Internal
Logic
AM/FM

Rating of a mode
Form AM/FM tuner
<FM 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 70dB
200kHz 8dB 22dB
Capture ratio 1.5dB
RF inter-modulation 80dB
Spurious disturbance ratio 120dB
Image ratio 120dB
IF/2 spurious response 100dB
AM oppression ratio (65dBf input) 80dB
Subcarrier oppression ratio 70dB
SCA disturbance ratio 80dB
Output voltage (±75kHz deflection) 1.0V
<FM 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 -0.5 dB
Stereo separation 100Hz:50dB
1kHz:50dB
10kHz:45dB
Stereo change inlet pressure 20dBf
<AM tuner part>
Received frequency 522kHz - 1611kHz
Practical speed (S/N 20dB) 20microvolts/m
Image disturbance ratio 50dB
THD (1 mV/m, 1kHz, 30% abnormal conditions) 0.3%
S/N ratio (1 mV/m, 1kHz, 30% abnormal conditions) 50dB
Demphasis 100microS
Output voltage (30% abnormal conditions) 0.3V
<Synthesis>
Antenna FM: 75-ohm disequilibrium (with a 300-ohm balance transducer)
AM: Empty core loop antenna
Alignment system Quartz synthesizer system
14-game random memory tuning
Detection system FM:DGL system
AM: Synchronous system
Output load impedance Fixed output: 200ohms
Variable output: 1.25kohm (maximum)
Meter Signal strength, a multipass / modulation change type
The semiconductor used Transistor: 38 pieces
FET: Six pieces
IC: 50 pieces
Diode: 63 pieces
LED: Ten pieces
Opt-in タラプタ: Two pieces
Power source AC100V, 50Hz/60Hz
Power consumption 23W
Dimensions the width 445x height 128x depth of 370mm (a piece includeds)
Weight 9kg
Option: Wood cabinet A-9 (\16,000)
Dimensions Width: 466x height 153x depth of 385mm