Accuphase T-109V

Commentary

FM stereo tuner with improved sound quality and performance based on T 109.

For tuning for channel selection, high precision tuning is realized by using a crystal oscillator, and there is almost no deviation due to time or temperature change, and it is locked at the point of minimum distortion and maximum sensitivity.
In addition, since it is electronically tuned, no modulation distortion or noise due to external vibration occurs.

The front-end section employs a double-tuned antenna circuit that passes through a selection circuit before being amplified by the antenna circuit to prevent cross modulation that occurs when a large input is directly amplified.
For high-frequency amplification, we use a cascode amplifier FET with less feedback. The input gate is equipped with an attenuator using a PIN diode. The attenuator is turned on and off by a microcomputer depending on the antenna input level. This allows for excessive input in areas near the transmitting tower.

The detection section is equipped with an advanced DGL (Differential Gain Linear) detection circuit that has been improved based on AccuPhase's original DGL (Differential Gain Linear) circuit with high performance, high reliability and no adjustment.
The input of this circuit uses a 2.4 MHz wide-band amplifier and a high-speed comparator to eliminate beat interference and 24 high-speed C-MOS IC delay circuits to improve stability.
The operation of this circuit is focused on the delay time of the output of the high-speed logic IC. The delay circuit is configured by delaying the phase angle by 114 degrees so that the distortion is minimized and the SN ratio is maximized by 24 ICs. This delay signal and the input signal are added to the exclusive OR circuit. The potential between the two signals is selected to open and close the circuit. At this time, the amplitude and density wave generated by the modulation is digitally detected and the music signal is extracted.
In this system, the linear region of the delay circuit is as wide as ± 2.5 MHz, and moreover, since there is no adjustment, stable and excellent linear differential gain characteristics can be obtained.

The IF stage has a 2-stage switching between Normal and Narrow.
Normally, wide-band Normal reception is used, and when interference with adjacent broadcasting stations is intense, switching to Narrow enables sharp reception with an emphasis on selectivity.

The stereo demodulation section uses the synchronization pilot signal included in the input signal to lock the internal oscillation circuit with the PLL circuit to obtain an accurate 38 kHz switching signal.
The T-109V uses an internal oscillation circuit of the PLL, a ceramic resonator and a variable positive and negative reactance circuit that can be controlled by the control voltage. This circuit provides accurate switching signals over a narrower locked frequency range without any adjustment.

The output jacks have a balanced XLR connector and a normal RCA pin jack.

It is equipped with a 16-station memory. Up to 16 stations can be stored in advance and called instantly by pressing a button. Functions matching the station can also be stored in memory simultaneously.

In addition to memory tuning, a manual tuner for a rotary knob using a pulse tuning method is mounted.
This disk is attached to the shaft of a rotary knob and has a structure in which a disk with radial slits passes through a phase detector (specific contact by light) to generate pulses, which are then input into a microcomputer to control the tuning frequency of the PLL.
When you turn the knob, a beep sounds to indicate a change in frequency.

The meter can be used to check the antenna input signal level and multi-path with a changeover switch.

Included functions include a noise filter to reduce the noise of weak stereo stations, a muting switch to remove the inter-station switch, a mono switch to force monaural, and output level control.

It can be operated with the attached remote commander.

Model Rating

Type	FM stereo tuner
MonAural Characteristics
Receiving frequency	76.0 mhz to 90.0 mhz
Practical sensitivity	11dBf(IHF)
S/N 50 dB sensitivity	17dBf(IHF)
Standing-wave ratio	1.5
S/N (80 dBf input, A-correction)	90dB
Total harmonic distortion factor (80 dBf input ± 75 kHz shift, Normal)	20Hz:0.02% 1kHz:0.02% 10kHz:0.02%
IM distortion factor	0.01% (80 dBf input, ± 75 kHz shift)
Frequency characteristic	10 Hz ~ 16000 Hz + 0 -1.0 dB
Two signal selectivity (IHF)	Disturbance wave Normal Narrow 400kHz 70dB 100 dB or more 300kHz 30dB 100dB 200kHz 10dB 40dB
Capture ratio	1.5dB
RF intermodulation	80dB
Spurious interference ratio	120dB
Image ratio	100dB
AM suppression ratio (65 dBf input)	80dB
Subcarrier suppression ratio	70dB
Output voltage (± 75 kHz deviation)	1.0V
Stereo Characteristics
Sensitivity	S/N 40 dB sensitivity : 29 dBf (IHF) S/N 50 dB sensitivity : 37 dBf (IHF)
S/N (80 dBf input, A-correction)	85dB
Total harmonic distortion factor (80 dBf input ± 75 kHz shift, Normal)	20Hz:0.04% 1kHz:0.04% 10kHz:0.04%
IM distortion factor	0.03% (80 dBf input, ± 75 kHz shift)
Frequency characteristic	10 Hz ~ 16000 Hz + 0 -1.0 dB
Stereo separation factor	100Hz:50dB 1kHz:50dB 10kHz:40dB
Stereo switching input voltage	20dBf
<General>
Antenna	75 Ω unbalanced (F-type connector)
Tuning system	Quartz synthesizer system 16-station random memory tuning
Detection system	Advanced DGL system
Output impedance	Balanced (Balanced XLR type) : 200 Ω (100 Ω / 100 Ω) Unbalanced Fixed output : 200 Ω Controlled (variable output) : 1.25k Ω (maximum)
Meter	Signal strength, multi-path switching
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	15W
Maximum external dimensions	Width 475x Height 140x Depth 402 mm
Weight	9.5kg
Attachment	Remote Commander RC-12 AC power cord Audio cable with plug F-type connector
Attachment : Remote Commander RC-12
Remote control system	Infrared pulse system
Pwer	DC3V
Dry battery	Uses 2 AA type
Maximum external dimensions	64 mm wide x 149 mm high x 18 mm deep
Weight	145g (including battery)