Yamamoto Sound Craft HA-03 Tube Headphone amp

Yamamoto Sound Craft HA-03 Tube Headphone amp

Blight and vivid tone color

International order > Manufacture > Yamamoto Sound Craft
International order > Category > Headphones > Headphone amplifier
International order > Category > Amplifier > Tube amplifier
International order > Category > Amplifier > Headphone amplifier
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Beautiful tube sound from both headphones and speakers 

Selected high quality parts and design. HA-03 is unique designed tube amplifier for speakers as well as  headphones. HA-03 uses same output circuit both for speakers and for headphones. The amplified circuit is Siemens vintage tube C3m, is pentode connected one stage amplify. Quiet simple structure. Non feedback, separate power supply for screen grid circuit and  plate circuit.
Headphone side is 50ohms, 1.4W x2, speaker side is 8ohms, 1W output. 1W is small output, but considering powerful tube driving power, it is enough power for bookshelf speakers, except quiet low efficient speakers. Also it corresponds wide range impedance for headphones. almost any kind of headphones could be easy to be driven. Actual ideal impedance range seems be from 16ohms to 200ohms.

Insulated rigid wooden chassis and high quality parts..

HIgh insulated, high strength phenolic resin reinforced wood brought high quality sound as well. Power transformer is big R core transformer, selected resistor and other parts from the world.
Vacuum Tube C3m (vintage vacuum tube by German Siemens) 2pcs. 
Maximum output
1.4W+1.4W (50ohms/headphones) 
1W+1W (8ohms/speakers)
Frequency Response  35Hz~17.5kHz(-3dB)
Residual Noise 57μV(A filter)
Input impedance 50kohms Input selectable: 2
Dimensions 156(W)330(D)165(H)mm
Weight 5.6㎏


Impression of the sound is smooth, but clear shape of sound, blight and vivid tone color.  Piano touch is clear and richness.
Excellent bass range for jazz. Sound field is huge, high density and excellent quality of feeling. I used SENNHEISER HD-650, 
Genuine custom made product of exceptional quality. 



2020/11/10 投稿者:Yuhang Han おすすめレベル:★★★★★

Bravo 👏
The ha-03 is a brilliant amplifier.
What’s more, I’ve got a pair of antique SONY full frequency speakers from one of their professional studios.
4 inches,8ohms,2w, cobalt-magnetic type.
That’s really the best.
By the way, music is line-out from MP3 player _P6 of Luxury&Precious brand ,it uses an r2r-type D-A converter.
CD player ,by the way,is dcp-150 from Denon.
Power supplies _Oyade R0 sockets &Chord Company ChordMusic cable.
RCA-3.5,I don’t know the exactly brand .