The Firebird Tubes Preamplifier  Version 3


The Firebird version 2 is Audio Experience Level 4 tube stereo preamplifier with MM/MC phono stage. 

The line stage use one 6C45 tube with one Hashimoto line output transformer construct (NOT NFB) for each channel.
The phono stage use one ECC83 and one ECC82 construct CR type RIAA EQ curve design, the CR Type is good method for revive RIAA EQ curve (NOT-NFB) for each channel.
The MC step-up transformer use Hashimoto HM-3 ( made in Japan )

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



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TANGO NP-126 line output transformer (made in Japan)


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Main unit front : Volume, R-input gain , L-input gain , Input selector, MC impedance selector, 
Low/High MC gain, MM/MC selector, Mono/stereo selector, Mute/Sound selector.

Main unit back : 19dB/14dB line stage output gain selector , XLR/RCA output mode selector.

Power supply : Power On/Of

Remote: volume .

Output :  1 pair XLR main output  , 2 pair RCA main output , 1 pair REC output .

Input : 3 pair RCA input , 1 pair XLR input , 1 pair MM input , 1 pair MC input .

Line output Impedance :  57 ohms
Recommended load:  600 ohm or greater.

Frequency Response:  
Line stage : 20 Hz ~ 100k Hz ( 20 Hz 0dB , 20K Hz 0dB , 100k Hz -3dB) at 1V output.
Phono stage : +/- 0. 25dB 20 Hz to 20K Hz , RIAA equalized

T.H.D : 
Line stage: 0.09%  1k Hz , 0.18% 20K Hz at 1V. ( test at Main output )
Phono stage: 0.16% 1k Hz , 0.25% 20 Hz , 0.3% 20K Hz at 1V ( test at REC output )

Input Impedance: 

Line : 10K ohm XLR , 50K ohm RCA.

MC low gain: 400 ohm , 250 ohm , 125 ohm , 70 ohm

MC high gain: 100 ohm , 60 ohm , 30 ohm ,  20 ohm 
MM is 47K / 100P

Line stage: 19 dB , 14dB ( XLR and RCA are same gain )
Phono stage: MM 37dB , MC low gain 63dB , MC high gain 69dB.

Line stage:  >110dB (0.045mv)

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

Channel Balance: <0.1dB(20Hz ~ 20KHz , at 2V output)

Channel Separation: >95dB(20Hz ~ 20KHz)

Phase Mode : Normal

Max Output : 23V

Tube Compliment : 2pcs ECC82 , 2pcs ECC82, 2pcs 6C45 , 1pcs 6X4. 

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

Weight: Main and power supply total 15kg

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


Actual Price:  HK$30,300.  one set (two unit)



Room1308, 13/F,BLK C,.  
Kai Tak FTY BLDG.   
99-101 King Fuk ST,.   
San Po Kong,   KLN,.
Hong Kong
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WhatsApp: 93440168   
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