I made this photo shoot on Sunday morning when I listening the music through my headphones along with the Bottlehead Crack and newly upgrade hybrid vacuum tube op-amps headphone amplifier here and here.
I actually find that this hybrid vacuum tube op-amps amplifier sound so good that can match with the big brother, is the Bottlehead Crack. With the total built cost for this hybrid vacuum tube op-amps amplifier is only one quarter cost of the Bottlehead Crack, I think it can be considerably a budget audiophile headphone amplifier.
The sound characteristic between them is very similar. Kind of neutral with extended high frequency and lot of micro details. The Bottlehead Crack gives more three dimensional and more aura in midrange. It is also warmer in sound presentation. It drives most headphones with ease and this creating more dynamic to the sound.
The hybrid vacuum tube op-amps amplifier is more compact and simple to carry around. It powered with 12 volt DC power supply or using 3 piece of 18650 lithium batteries. This amplifier drives any headphones relatively ease but lesser power output than the Bottlehead Crack.
So here are the Sunday photos show, they are consist of:
The Bottlehead Crack headphones amplifier
The Hybrid Vacuum Tube Op-amps headphones amplifier
Sennheiser HD600
Sony MH1C (just for fun comparison, although this earphone is not suitable when using amplifier)
DIY DAC PCM56
DIY Furutech 6.5 mm headphone jack for HD600 with silver coated wires.
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