Phono Equalizer

Both Gain Phase Frequency Curves are flat all through the audio bandwidth.

  HEQA02

CATALOG :: Download
    [2.4MB]
Input Tuned to HTCR01 mkII
Max Output Voltage 200mV
RIAA Curve Deviation less than 0.2dB (20~20kHz)
Output Phase Shift less than 1 (20~20kHz)
Dimension (WxHxD) 155 x 60 x 270 mm
Weight 2.5kg

The circuit of HEQA02 is successfully suppressing the phase shift while realizing the precise equalization.
This is an an ideal partner for HCTR01 mkII (ultra low inductance MC cartridge), with its special input stage circuit designed specifically to match
the extraordinary low inductance and impedance.
 
The equalizing circuit is NF+CR type, adjusting the lower frequency range to RIAA curve by NF low boost circuit, and then rolling off the high frequency range by CR circuit.
 
Due to the phase sensitive design policy, the output from the RIAA equalization has, flat gain and phase curves over full range of audio bandwidth, boosting less than
1 phase deviation over 20Hz through 20kHz, and RIAA deviation of less than 0.2dB. 

 

  HEQA01

CATALOG :: Download
  [568KB]
Input MM MC
Input Sensitivity 2.5mV 0.25mV
Input Impedance 47kΩ 4Ω
Gain 36dB 62dB
Max Input Rating 160mV 8.5mV
Max Output Voltage 200mV
RIAA Curve Deviation less than 0.2dB (20~20kHz)
Output Phase Shift less than 1 (20~20kHz)
Dimension (WxHxD) 223 x 83 x 370 mm
Weight 4.6kg

Phono Equalizer is used to recover the original sound signal from the RIAA modulated recorded signal. The conventional equalizers are designed for the precision of only the gain curve, and not much attention is paid to the phase shift happening while equalization. The circuit of HEQA01 is successfully suppressing this phase shift while pursuing the precise equalization. Accordingly, this is an ideal partner for HCTR01 (super low impedance MC cartridge) which is specifically designed to minimize the phase shift.
The equalizing circuit is NF+CR type, adjusting the lower frequency range to RIAA curve by NF low boost circuit, and then rolling off the high frequency range by CR circuit. It uses the highest quality chips for its circuit to maximize its performance, such as, AD797 based input buffer and OPA627 based NF low boost and output buffer circuits.
 
Due to this phase sensitive design policy, the output from the RIAA equalization has flat gain and phase curves over full range of audio bandwidth, boosting less than 1 phase deviation over 20Hz through 20kHz, and RIAA deviation of less than 0.2dB. It also has the built-in demagnetizer, which can be activated while the playback, by simply pushing the Degauss Button on the panel, which shunts the circuit to release the core magnetization.

 

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