Audio Database

The

Accuphase T-109V
170,000 yen(May, 1999 release)

Description
 
FM stereo tuner which applied based on T-109 and applied the polish to sound quality and the engine performance.

The alignment for tuning has realized highly precise alignment by using a crystal oscillator, most gaps by time or a temperature change cannot be found, and it locks at the point of the distorted minimum and sensitivity highest.
Moreover, the abnormal-conditions distortion or noise by external vibration are not made for electronic tuning.

In the front end part, the intermodulation generated when the antenna double tuning circuit which lets a selection circuit pass is adopted and the Dainyuu power is directly amplified before amplifying in an antenna circuit is prevented.
Moreover, FET of cascode amplifier composition with little feedback is adopted as high frequency magnification. The Attenuator by a PIN diode is prepared in the gate of the input, and the excess Dainyuu power in the area where a transmitting tower is near is also coped with by turning on and off this Attenuator with a micro computer with an antenna input level.

The Advanced DGL detection circuit where improvement was added based on the high performance & quantity reliability & DGL (Differential Gain Linear) circuit whose Accuphase is not adjusted [ original ] is carried in the detection part.
In the input unit of this circuit, a high-speed comparator is used for a 2.4MHz broadband amplifier, and beat disturbance is made for there to be nothing. Moreover, stability is raised to the delay circuit using 24 high speed C-MOS IC.
Paying attention to the delay time of the output of a high-speed logic IC, a delay circuit carries out operation of this circuit to the composition which delayed the degree of phase angle 114 degrees so that the distorted minimum and the signal to noise ratio might become the maximum by 24 ICs. This delay signal and incoming signal are applied to an exclusive OR circuit, the electric potential between two signals is chosen, and a circuit is opened and closed. The compression waves produced by abnormal conditions at this time are detected in digital one, and a music signal is taken out.
This system has a linear region of a delay circuit as large as ±2.5MHz, and since it moreover is not adjusting, the differentiation profit straight line characteristic of it having been stable and having excelled can be acquired.

IF stage has adopted two-step switching of Normal and Narrow.
Usually, Normal of broadband reception is used, and when interference with an adjoining broadcasting station is intense, the sharp reception focused on a selection degree is possible by changing to Narrow.

In the stereo recovery part, using the pilot signal for a synchronization included in the incoming signal, the internal oscillating circuit was locked by the PLL circuit, and the exact 38kHz switching signal has been acquired.
In T-109V, the 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. This circuit is a lock frequency range narrower than before, and an exact switching signal is acquired by no adjusting.

The XLR connector for balance and the usual RCA pin jack are carried in the output terminal.

A 16-game memory is carried, the memory is beforehand carried out to 16 games, and it can call with a button in an instant. Moreover, it is possible to carry out the memory also of each function which matched the office simultaneously.

Besides memory tuning, the manual alignment machine of the rotating knob by a pulse tuning system is carried.
It is attached to the shaft of a rotating knob, the disc in which the slit was cut radiately generates a pulse by carrying out phase detector (ratio by light contact) passage, and this has structure which inputs this pulse into a microcomputer and controls the alignment frequency of PLL.
Rotation of a knob will tell change of frequency by generating of a beep sound.

The check of an antenna incoming signal level and a multipass is possible for meter by a changeover switch.

The noise filter which reduces the noise of the weak stereo office of an electric wave as an attached function, the muting switch which removes the switch between offices, the mono-switch compulsorily used as a monophonic recording, and the output level control are carried.

It can be operated by an attached remote commander.

Rear Attached
Internal

Rating of a mode
Form FM stereo 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:0.02%
1kHz:0.02%
10kHz:0.02%
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 or more
300kHz 30dB 100dB
200kHz 10dB 40dB
Capture ratio 1.5dB
RF inter-modulation 80dB
Spurious disturbance ratio 120dB
Image ratio 100dB
AM oppression ratio (65dBf input) 80dB
Subcarrier oppression ratio 70dB
Output voltage (±75kHz deflection) 1.0V
<Stereo characteristic>
Sensitivity S/N 40dB sensitivity: 29dBf (IHF)
S/N 50dB sensitivity: 37dBf (IHF)
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:0.04%
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 (F type connector)
Alignment system Quartz synthesizer system
16-game random memory tuning
Detection system Advanced DGL system
Output load impedance
Balanced (balanced XLR type) : 200ohms (100ohm/100ohm)
Unbalanced (disequilibrium) Fixed (fixed output): 200ohms
Controlled(variable output): 1.25kohm (maximum)
Meter Signal strength, a multipass change type
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 15W
The maximum Dimensions Width 475x height 140x depth of 402mm
Weight 9.5kg
Attachment Remote commander RC-12
AC power cord
An audio cable with a plug
F type connector
Attachment: Remote commander RC-12
Remote control system Infrared pulse system
Power source DC3V
Battery AA -- type two-piece use
The maximum Dimensions 64mm[ in width ] x height 149x depth of 18mm
Weight 145g (battery included)