KRELL KRC
¥ 1,450,000 (around 1994)
Commentary
Line control amplifier pursuing high bias pure class A low-impedance configuration.
The KRC achieves a maximum output of 28 v with an output impedance of 4 Ω.
The line amplifier section employs a balanced method for all stages to ensure high S/N and to eliminate external influences.
The input stage uses FET to avoid the influence of source impedance variation on sound quality, and the output stage uses bipolar elements suitable for high current in order to realize a low-impedance configuration with high driving force for full complimentary service pure class A operation.
All signal paths are direct coupled, eliminating the colorization by capacitors, and the servo feedback circuit ensures stable operation with reliable DC offset.
The power supply is designed independently to eliminate mutual interference with the amplifier circuit.
In addition, in order to ensure a powerful and spacious power supply capability, it is equipped with a regulator power supply unit far exceeding the current capacity required for music signals.
In order to maintain signal purity, all stages are directly connected without wiring.
In addition, high-precision parts such as resistors of the US military standard (within ± 1% deviation) are used, and parts are arranged so that maximum efficiency can be obtained through sufficient examination and trial listening.
The KRC, which has a particularly complex amplification system, uses a four layer glass-epoxy laminated board, in which audio signals, DC power supply, and two layers of ground are laminated on a single circuit board. This ensures a stable power supply by connecting all elements directly to the power supply in the shortest time. In addition, by connecting each ground point directly to two ground patterns, the influence of the power supply on the audio signal is eliminated and interference noise from other circuits is cut off.
Analog source can be supported by built-in special board Phono-B (sold separately).
In this board, input sensitivity and impedance can be changed by combination of internal DIP switch, and it is compatible with MC/MM cartridge.
A high-quality gold-plated relay is used for the switching of the body, enabling high precision control.
The volume control system uses a stepper motor to drive ultra-precision volume.
Pure class A operation with high bias is adopted.
It comes with a wireless remote control, so you can operate the main body and turn the power amplifier ON/OFF.
This remote control has a solid aluminum machined finish.
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Model Rating
| Type | Line control amplifier |
| Input sensitivity (at 2 V rated output) | 530mV |
| Total harmonic distortion factor | 0.01% or less |
| S/N ratio (A) | 100 dB or more |
| Frequency characteristic | 2 Hz ~ 200 kHz + 0 -0.5 dB |
| Rated Output / Impedance | 2.0V/4 Ω |
| Maximum power output | 28V |
| External dimensions | Body : Width 483x Height 70x Depth 387 mm Power Supply : W 221x H 64x D 286 mm |
| Weight | 8.9 kg (including power supply) |
| Attachment | Wireless Remote Control |
| Separately sold : Phono equalizer board Phono-B (¥ 120,000) | |
| S/N ratio (A) | MC:80dB MM:95dB |
| Input impedance | Variable from 10 Ω to 47k Ω |
| Frequency response | 20 Hz to 20 kHz ± 0.1 dB |
| Gain | MC:64.5dB MM:36.5dB |
| Total harmonic distortion factor | MC : not more than 0.03% MM : not more than 0.01% |
| Input sensitivity | MC:1.2mV MM:30mV |