Lo-D SR-3100

Commentary

AM/FM stereo / FM stereo receiver that integrates Lordi's receiver's receiver technology.

The FM tuner uses a dual-gate MOS FET and a 3-row varicon AGC on the front end.
In addition, a high integration IC, the IF part of a 4-element phase linear ceramic filter, and highly reliable quadrature detection have realized good distortion factor and S/N characteristics.

The multi-demodulation circuit uses a double-balanced differential switching circuit to obtain stable separation.

The power amplifier section uses an inverted Darlington type OCL circuit directly connected to all stages using NPN and PNP silicon transistors with good linearity.

In the equalizer stage of the preamp section, a circular transistor designed for low noise is used in the first stage to reduce input conversion noise. In addition, the 3 stages of ± 2 power supply system 2 power supply system, it has a large bare characteristics. Since a large amount of NF is applied, low distortion is realized over the whole band.

Large-capacity transistors and zener diodes are used for the tuner, equalizer and driver stages. Each stage is supplied by a separate rectifier circuit and constant voltage power supply, thereby suppressing voltage fluctuation of the AC line and interference between circuit blocks and channels.

The AM tuner section uses a 4-element phase linear filter and a high-integration IC balanced mixer.

Equipped with microphone mixing circuit and FM muting mechanism.

Model Rating

Type	FM/AM Receiver
Amplifier Unit
Effective power	1 kHz, both channel drive : 18W + 18W (4 Ω) 15W + 15W (8 Ω) 1 kHz, single-channel drive : 22W/22W (4 Ω) 19W/19W (8 Ω)
Dynamic Power (IHF)	45W (8 Ω)
Total harmonic distortion factor	0.8% (at effective output) 0.1% (at 1/2 Effective Output)
Cross modulation distortion factor	0.8% (at effective output) 0.1% (at 1W output)
Output Bandwidth (IHF)	10 Hz to 50 kHz
Frequency characteristic	10 Hz to 30 kHz ± 2 dB
Damping factor	30 or More (1 kHz, 8 Ω)
Input Sensitivity / Impedance	Phono : 2.5mV/50k Ω Aux : 200mV/100k Ω Tape PB : 200mV/35k Ω Mic : 7mV/30k Ω
Phono maximum allowable input	100 mV (RMS, 1 kHz)
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
Loudness control (Volume -30dB)	+ 9 dB (100 Hz), + 5 dB (10 kHz)
S/N (IHF, A-Network, input short)	Phono:65dB Aux, Tape PB : 70 dB
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Practical sensitivity (IHF)	1.9 μ V
Capture ratio	1.0dB
Effective selectivity	52dB
S/N	67dB
Total harmonic distortion rate (400 Hz)	mono:0.3% stereo:0.6%
Separation	41dB(1kHz)
<AM Tuner Section>
Receiving frequency	520 kHz to 1,605 kHz
Practical sensitivity (IHF)	20 μ V
Selectivity	35dB
Image interference ratio	56dB
<General>
Semiconductor used	Transistor : 16 FET : 1 IC : 5 Diode : 23 Pieces
Power supply voltage	100 VAC, 50Hz/60Hz
Rated power consumption (Electrical Appliance and Material Control Law)	55W
External dimensions	Width 413x Height 136x Depth 376 mm
Weight	7.6kg