The Planets Phono Amplifier

THE PLANETS phono amplifier

Level 4 Phono amplifier .

The main unit with power supply of 2 unit design.

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

It uses ECC83 tube not-NFB input stage, CR type Curve EQ ( six kind Eq curve ), 5687WB with Hasimoto line output transformer output stage( with XLR and RCA output).

The The Planets 's application of a highly efficient solid-state voltage regulator with EZ81 Tube for current regulator and Hasimoto choke in the HVB+ power supply . Also it use the external power supply get highest S/N.

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

Features

ECC83 not-NFB input stage.
5687WB with Hasimoto line transformer in output stage.
Vishay/Dale RN55, Amtrans AMRA Resistors
CR type Eq curve , not-NFB
Hasimoto HM-X MC step-up transformer.
AudioCap, Jupiter Copper foil (wax paper and Polypropylene film) and MultiCap RTX coupling cap
2 pair MM input , 2 pair MC input
Output with both XLR and RCA output
Phase select switch Normal / Inverse
Curve control with select 6 kind EQ curve
Mono / Stereo select
Gain select switch with 6 position gain
MC impedance select switch with 6 position
External power supply
Two Hasimoto Choke at HVB+ power supply

The Planets 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.

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

Review by HiFi review #415

Specifications

Controls.
Power Supply : Power On/Of .

Main Unit :
MC impedance select ,Gain select, Eq curve select , Input select MC1 / MC2 / MM1 / MM2 .
MC Gain High/Low , Mono / Stereo , Mute / Sound , Phase Normal / Inverse

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

Input : MC1 input , MC2 input , MM1 input , MM2 input . ( all RCA ).

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

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

Gain:
1 is Low MC 66.5dB / High MC 72.5dB / MM 43dB ,
2 is Low MC 65.5dB / High MC 71.5dB / MM 42dB ,
3 is Low MC 64.5dB / High MC 70.5dB / MM 41dB ,
4 is Low MC 63dB / High MC 69dB / MM 39.5dB ,
5 is Low MC 61.5dB / High MC 67.5dB / MM 38dB ,
6 is Low MC 58dB / High MC 64.5dB / MM 35dB ,

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

Noise: MM 88dB (shorted input) , MC 83dB (shorted input).
signal-to-noise ratio, below 1 Volts RMS output, A weighted

Phase Mode : Normal / Inverse.

Max input : MM 78mV , MC 7.8mV

Distortion: Less than 0.09% at 2V RMS 1kHz output.

Tube Compliment : ECC83 x2, 5687WB x2, EZ81 x1.

Dimension:
Main unit , 455mm x 350mm x 120mm (W x D x H)
Power Supply ,210mm x 330mm x 100mm (W x D x H)

Total Weight: 15kg

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

Actual price: HKD$29,300 one set (two unit)　

YS-Audio
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
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San Po Kong,   KLN,.
Hong Kong
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