Reference One MK-7 Line Preamplifier

Reference one MK-7 tube line preamplifier (Since: JULY 2026)

The Reference One MK-7 (Since: Nov 2026) is Audio Experience Reference Grade line preamp. It is a new design preamplifier . The balanced input buffer stage use one E88CC tube for each channel, it provide high input impedance ( Balanced input 200k ohm ) to low output impedance and true balanced input. The main line amplifier stage use one ECC82 tube at input stage to driver 5842 (417A) tube with one Hashimoto line output transformer construct Low output impedance ,Class A for each channel.

The Reference One 's application of a highly efficient solid-state voltage regulator with EZ81 Tube for current regulator and Hashimoto choke in the HVB+ power supply . Also it use the external power supply get highest S/N, the power supply is dual mono design.

Features

New design balanced input buffer stage use E88CC tube.
High balanced input impedance 200k ohm
5842/417A tube and ECC82 tube for amplifie stage.
Hashimoto line output transformer (made in Japan).
Class A .
Gain and Volume uses TKD conductive plastic potentiometer
Vishay Date , AMRA , PRP resistors.
XLR output and RCA output
External power supply ( dual mono design )
Double Hasimoto Choke (made in Japan) at HVB+ power supply
Jupiter Aluminum Foil Paper-in-Oil and Mundorf Mcap supreme coupling capacitors
High/Low gain selector
Gold-plated OFC copper wire for inside interconnect cable.

Specifications

Controls
Main unit : Volume , Input gain, Input Selector , Output XLR/RCA Selector , High/Low Main gain selector .

Power supply : Power On/Of

Output : Two pair XLR Main Output , Two pair RCA Main Output .

Input : Two pair XLR input , Two pair RCA input.

Output Impedance : 52 ohms
Recommended load: 600 ohm or greater.

Frequency Response:
20Hz ~ 90kHz ( 20Hz 0dB, 90kHz -3dB ) Test at gain 13dB , XLR input, XLR/RCA output, output 1V.

T.H.D : 0.07% Test at low gain , XLR input , XLR/RCA output, output 1V.

Input Impedance: 200K ohm XLR , 50K ohm RCA.

Gain:
High gain 18 dB ( RCA Input, XLR/RCA Output ) , 11.5dB ( XLR Input. XLR/RCA Output)
Low gain 13 dB ( RCA Input, XLR/ RCA Output ) , 6.4 dB ( XLR Input, XLR/ RCA Output )

S/N: >114dB

Channel Balance: <0.1dB(20Hz ~ 20KHz /max output)

Channel Separation: >98dB(2Hz ~ 20KHz)

Phase Mode : Normal

Max Output : 26V

Tubes : 2pcs E88CC , 2pcs ECC82 , 2pcs 5842/417A , 2pcs EZ81.

Dimension: Main 400mm x 310mm x 163mm (W x D x H) , power supply 400mm x 310mm x 80mm (W x D x H)

Weight: Main and power supply total 12.5kg

Power Source: 110V-120V / 220V-240V, 50/60Hz

Not remote version actual price: HK$30,800.

With remote ( remote volume controls only ) version actual price: HK$32800.

The Reference one MK-V have black and silver two color version.

YS-Audio
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
99-101 King Fuk ST,.
San Po Kong,   KLN,.
Hong Kong
Tel:(852)93440168
E-mail : info@ys-audio.com
WhatsApp: 93440168
facebook : https://www.facebook.com/AudioExperienceYSaudio/