Accuphase T-101

Commentary

An FM stereo tuner was developed with the aim of driving Radio noises, noise, distortion, etc. mixed during transmission below the limit level that cannot be detected by the ears.

The front-end section combines a high-frequency amplification stage and mixing circuit using a 4-channel frequency number line FM-dedicated precision varicon, a dual-gate MOS FET, and a high-stability local oscillation circuit with a buffer to obtain excellent characteristics with a wide dynamic range.

The IF circuit employs a variable selectivity type to resolve adjacent interference, and is a combination of a newly developed 10-stage LC concentrated phase linear bandpass filter and a high-selectivity piezoelectric transducer filter to reduce distortion.
Normally, only the linear-phase filter works, and when there is adjacent interference, a Viezo oscillator filter is added by switching the Selectivity switch to Narrow to add a high-selectivity characteristic and clear reception can be obtained by removing Radio noises.

The detector circuit uses a 1200 kHz wide-band discriminator with a bandwidth three times that of the ordinary one.

The stereo demodulation section employs a phase-locked loop demodulation circuit that automatically synchronizes the phase of the pilot signal sent from the broadcasting station with the phase of the subcarrier oscillator without using any coils or capacitors.

In addition to the signal strength meter and center tuning meter, an independent multi-path meter is mounted.
This meter makes it easy to find out the best direction of the antenna.

It is equipped with a muting switch, a stereo noise filter, and a switch that receives only FM stereo broadcast transmission.
A detection output circuit is also installed in preparation for 4-channel broadcasting.

There was a walnut cabinet sold separately.

Model Rating

Type	FM stereo tuner
MonAural Characteristics
Practical sensitivity	11 dBf (new IHF) 2.0 μ V (IHF)
50dBS/N	18 dBf (new IHF) 4.5 μ V (IHF)
Standing-wave ratio	1.5
S/N (65 dBf input)	75dB
Harmonic distortion factor (65 dBf input Selectivity switch Normal)	100Hz:0.1% 1kHz:0.1% 10kHz:0.2%
IM Distortion Factor (14 hz : 15 khz = 1 : 1)	0.2% (65 dBf, 100% modulation)
Frequency characteristic	20 Hz ~ 15000 Hz + 0 -1.0 dB
2-signal selectivity (45 dBf input)	Disturbance wave Selectivity Normal Selectivity Narrow 400kHz 55dB 100dB 300kHz 30dB 75dB 200kHz 6dB 20dB
Capture ratio	2.0dB
RF intermodulation	70dB
Spurious interference ratio	100dB
Image ratio (76 mhz to 90 mhz)	90dB
IF interference ratio	100dB
AM suppression ratio (65 dBf input)	55dB
Frequency stability	± 30 kHz
Frequency accuracy	+ / - 0.2%
Output voltage (100% modulation)	2.0V
Stereo Characteristics
Practical sensitivity	31 dBf (new IHF) 20 μ V (IHF)
50dBS/N	38 dBf (New IHF) 45 μ V (IHF)
S/N (65 dBf input)	70dB
Harmonic distortion factor (65 dBf input, Selectivity Normal)	100Hz:0.2% 1kHz:0.2% 10kHz:0.5%
Frequency characteristic	20 Hz ~ 15 kHz + 0 -1.0 dB
Stereo separation factor	100Hz:35dB 1kHz:45dB 10kHz:30dB
Stereo switching input voltage	19 dBf (new IHF) 5 μ V (IHF)
Muting level	19 dBf (new IHF) 5 μ V (IHF)
<General>
SCA interference ratio	60dB
Leakage at 19 khz and 38 khz	-70dB
Variable capacitor used	Frequency number line Type Precision 4 Train
Output impedance	Fixed output terminal : 200 Ω Variable Output Terminal : 2.5k Ω
Antenna input impedance	Balance : 300 Ω Unbalanced : 75 Ω
Meter	3 pieces Signal strength meter, multi-pass, center tuning
Semiconductor used	Transistor : 25 FET : 2 IC : 7 Diode : 24 units
Power supply voltage	AC100V/117V/220V/240V, 50Hz/60Hz
Power consumption	26W
External dimensions	Width 455x Height 152x Depth 355 mm
Weight	11.1kg
Sold Separately	Wood Cabinet A-3