Audio Database

L-510
Commentary

Pre-main amplifier with DUO β circuit / S.

DUO β circuit / S is adopted for the power part, and the contents of the circuit are almost equivalent to L-530.
The input of the power section is a parallel connection of a high-gm low-noise FET. A large current is supplied to obtain all necessary gains, and the pre-drive stage is eliminated. In addition, an "appropriate amount NFB" and a "DC servo" are provided to complete the sound quality.

The class A operating range has been expanded to 8W, and most of the normal listening level is covered by the class A operation.
In addition, the maximum output power of 100W has been realized in the class AB, and it is also applicable to large signal input which rapidly rises.
The output stage is a parallel P. P. by adopting R. E. T.

The equalizer section switches the open loop gain to determine the appropriate amount of both NFB for MC and MM respectively, so it can be said to be two dedicated equalizers.
A high-gm low-noise FET developed for the MC head amplifier is used for the input by parallel differential amplification, and not only SN ratio but also distortion and sound quality are improved.

Equipped with a phono and straight function that can be switched with the switch giving the highest priority to the disk.
Pure disk playback is possible by disconnecting the wiring to the contacts such as selectors, filters, balance control, etc.

The tone control allows you to select six points for each of the high and low frequencies, and you are asked for your preferred sound quality.
In addition, since the NFB circuit of the power section is used instead of an independent amplifier circuit, noise generation and deterioration of sound quality are not caused.

The power supply uses a large transformer with a capacity of 300 VA and a block capacitor with a capacity of 15,000 μ Fx2.
The heat sink of the Skype Fin is equivalent to the L-530.

Equipped with a warm-up indicator. When the warm-up is completed, it detects the time and temperature and turns off the indicator. You can confirm that the sound quality is stable.

Equipped with a recording switch, you can record with two tape decks by pressing the switch.
Normally, Rec Out is turned off so that sound quality does not deteriorate.

Model Rating
Type Integrated amplifier
Effective output (both channel operation) Class A region : 8W + 8W (8 Ω)
Class AB Maximum : 100W + 100W (8 Ω)
Total harmonic distortion factor 0.007% or Less (8 Ω, Both Channel Operation, 8W)
Input sensitivity Phono MM:2mV
Phono MC : 125 μ V
Tuner, AUX, Monitor, Main In : 310 mv
Input impedance Phono MM : 100k Ω, 50k Ω, 100 Ω
Phono MC : 300 Ω, 100 Ω, 40 Ω
Tuner, AUX, Monitor : 40k Ω
Main In : 47k Ω
Signal-to-noise ratio (IHF-A) Phono MM:84dB
Phono MC : 67 dB (250 μ V input)
Tuner, AUX, Monitor, Main In : 110 dB
Frequency characteristic 10 Hz to 100 kHz -1dB
Tone control Low turnover : 77 Hz, 120 Hz, 200 Hz, 330 Hz, 550 Hz, 880 Hz
High turnover : 880 Hz, 1.5 kHz, 2.5 kHz, 4 kHz, 6.5 kHz, 10 kHz
Maximum variation : + / - 8 dB
Tape monitor Two lines (Tape1 and 2)
Tape dubbing Route 2 (1 → 2, 2 → 1)
Filter Subsonic : 15 Hz
High Cut : 9 kHz
Power consumption 365W
External dimensions Width 453x Height 161x Depth 444 mm
Weight 17.3kg