I was asked by a fellow Stereo Net Australia (SNA) member
to assemble a bottlehead headphone amp named Crack. But I didn’t know that I was also going to
have to paint the top plate and prep and finish the blond base. But wait, there
is more. The member had also purchased the Speedball upgrade which consisted of
three cct. brds. which work as a constant current source. Fortunately the
member realised the amount of work involved and rewarded my efforts. Thanks.
The instructions which come with the it are detailed bit I
would not advise this kit for a first timer, The cct. brds. are compact and
require careful soldering. The rest is easy but still a fair bit of work. The
amp came up well, sounds excellent. I would recommend the kits and upgrade
Speedball. The amp worked well with my 32ohm DT770s but I feel may work even
better with 250ohm or higher cans.
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