Mercury MM Phono Amplifier

Mercury valve tube MM phono amplifier

Level 3 valve tube MM phono amplifier .

The main unit with power supply of 2 unit design.

Mercury use CR type EQ curve design, the CR Type is good method for revive EQ curve ( not-NFB).

It uses ECC83 tube Class A and not-NFB input stage, CR type Curve EQ ( six kind Eq curve ), ECC81 and E88CC tubes Class A and not-NFB output stage

The Mercury 's application of a highly efficient solid-state voltage regulator with 6X4 Tube for current regulator and R-Core ( Japan Hi-B core ) choke in the HVB+ power supply . Also it use the external power supply get highest S/N.

Features

ECC83 Class A and not-NFB input stage.
ECC81 , E88CC Class A and not-NFB output stage.
Vishay/Dale RN55, Amtrans AMRA Resistors
CR type Eq curve , not-NFB
Miflex KPCU ( Copper foil Poly/Paper in Oil) coupling cap and Philips MKP coupling cap
2 pair MM input
Curve control with select 6 kind EQ curve
Mono / Stereo select
Gain select switch with 6 position gain
Input impedance select switch with 2 position
Input capacitance select switch with 5 position
External power supply
R-Core ( Japan Hi-B Core ) Choke at HVB+ power supply

Mercury has a select control for select 6 kind EQ curve :
RIAA , Londo , LP , CCIR , AES , NAB .

RIAA, match 99% LP. ( 1955 after )

Londo , LP , CCIR , AES , NAB are other curve for old LP. ( 1955 before )
Please see following table , there have more infornmation.

Review by HiFi review.

Specifications

Controls.
Power Supply : Power On/Of .

Main Unit :
Input impedance select , Input Capacitance select, Gain select, Eq curve select , Input select , Mono / Stereo

Output : 1pair Main RCA.

Input : MM1 input , MM2 input . ( all RCA ).

Output Impedance :
2K ohms , 20K ohms minimum load.

Frequency Response: +/- 0. 25dB 20Hz to 20KHz , RIAA equalized

Input Impedance: 47K , 100K
Input Capacitance: 20P , 100P , 220P , 330P , 470P

Gain:
45dB , 44dB , 43dB , 41.5dB , 40dB , 37dB ,

EQ curve:
RIAA , Londo , LP , CCIR , AES , NAB .

Noise: MM 85dB (shorted input)
signal-to-noise ratio, below 1 Volts RMS output, A weighted

Phase Mode : Normal

Max input : MM 70mV

Distortion: Less than 0.14% at 1V RMS 1kHz output.

Tube Compliment : ECC83 x2, ECC81 x2, E88CC x1, 6X4 x1.

Dimension:
main 430mm x 310mm x 100mm (W x D x H) ,
power supply 160mm x 135mm x 60mm (W x D x H).

Total Weight: 10kg

Power Source: 110-127/220 - 240V,50/60Hz

Actual price: HKD$12,800 one set (two unit)

Add extra cost $5300 for upgrade to SE version with Hashimoto line output transformer , XLR output and normal / inverse phase control.

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