Reference One phono MK3 Version2.5

Reference One Phono MK3 phono amplifier Version 2.5

Reference grade Phono preamplifier .

The main unit with power supply of 2 unit design.

The Reference-One use T-LCR type RIAA EQ design, the T-LCR Type is best method for revive RIAA EQ, also is highest cost design.

It uses 12AX7 ,6DJ8 with Hasimoto line output transformer for input stage, special made T-LCR type RIAA EQ , 5687WB with Hasimoto line output transformer output stage( with XLR and RCA output).

The Reference One 's application of a highly efficient solid-state voltage regulator with EZ80 Tube for current regulator and Hasimoto choke in the HVB+ power supply . Also it use the external power supply get highest S/N, the power supply is dual mono design.

The MC step up transformer use Hasimoto HM-X ( made in Japan )

Features

The input stage consist of 12AX7 , 6DJ8 with Hasimoto line transformer.
The output stage consist of 5687WB with Hasimoto line transformer.
Version 2.5 Not NFB output stage has improved Transient Intermodulation Distortion .
New design gain control system has improved distortion and definition .
New LCR network has improved frequency response
Vishay/Dale RN55, A/B , RMA Resistors
LCR network use Hasimoto Inductive
Hasimoto HM-X MC step-up transformer.
M-CAP® Supreme Silver / Gold & Oil, Auricap XO and Miflex KFPM copper foil polypropylene film coupling cap
Output with both XLR and RCA
Phase select switch Normal / Inverse
External power supply
Two Hasimoto Choke at HVB+ power supply
Phase select switch Normal / Inverse
Gain select switch with 6 position gain
MC impedance select switch with 6 position

The red items are Version 2.5 improve.

The power supply

Gain select switch with 6 position gain , MC impedance select switch with 6 position .

T-LCR Type is Line output transformer drive the LCR network

More info for LCR network

Reference One Phono MK3 MM only phono amplifier ( Version 2)

Review of Reference One Phono MK3 Version 2 (New version ) by HiFi review #434

Review of Reference One Phono MK3 Version 1 (old version ) by HiFi review #407

Reference One Phono MK3 Version 2 review by " Hi Fi Bible" Autumn 2022

Reference One Phono MK3 Version 1 (old version ) Review by THE HIGH END AUDIO JOURNAL OF HONG KONG #403 October 2019

Reference One Phono MK3 Version 1 (old version ) Review by THE HIGH END AUDIO JOURNAL OF HONG KONG #404 November 2019

Specifications

Controls.
Power Supply : Power On/Of .

Main Unit :
MC impedance select ,Gain select, Phase Normal / Inverse ,
Input MC/MM , MC Gain High/Low , MC Input 1,2,3.

Output : 1 pair Main XLR , 1pair Main RCA.

Input : MC1 input , MC2 input , MC3 input , MM input . ( all RCA ).

Output Impedance :
60 ohms ( XLR and RCA same ) , 600 ohms minimum load.

Frequency Response: +/- 0.18dB 20Hz to 20KHz . -3dB at 60KHz , RIAA equalized.

Input Impedance:

MC low gain:
520 ohm , 350 ohm , 200 ohm , 100ohm , 75 ohm , 50 ohm

MC high gain:
133 ohm , 90 ohm , 52 ohm , 30 ohm , 20 ohm , 10 ohm

MM is 47K / 100P ( the capacitance impedance can change by module )

Gain:
1 is Low MC 68.5dB / High MC 74.5dB / MM 45dB ,
2 is Low MC 67.5dB / High MC 73.5dB / MM 44dB ,
3 is Low MC 66.5dB / High MC 72.5dB / MM 43dB ,
4 is Low MC 65dB / High MC 71dB / MM 41.5dB ,
5 is Low MC 63.5dB / High MC 69.5dB / MM 40dB ,
6 is Low MC 60dB / High MC 66.5dB / MM 37dB ,

Noise: MM 93dB (shorted input) , MC 92dB (shorted input).
signal-to-noise ratio, below 1 Volts RMS output, A weighted

Phase Mode : Normal / Inverse.

Max input : MM 80mV , MC 8mV

Distortion: Less than 0.088% at 2V RMS 1kHz output.

Tube Compliment : 12AX7 x2, 6DJ8 x2, 5687WB x2, EZ80 x2.

Dimension:
Main unit , 400mm x 300mm x 165mm (W x D x H)
Power Supply ,455mm x 350mm x 120mm (W x D x H)

Total Weight: 25kg

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

Actual price: HKD$51,800 one set (two unit)　

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/