![]() With that said, Bottlehead's Crack 1.1 harkens back to one of their headphone amplifier designs from several years ago that were hailed as some of the best sounding of their day. OTLs use one of two primary methods for output stage coupling: direct coupling (DC) or capacitive coupling (AC). OTL is a type of vacuum tube audio power amplifier that removes the use of an output transformer for the purpose of greater linearity and fidelity. Crack is the company's version of classic OTL ![]() Their initial goal was to come up with another easy to build, great sounding design that would harken back to Bottlehead's early days. That was pretty much Doc Bottlehead's (Dan Schmalle) experience when they built and listened to this new bang for the buck headphone amplifier. ![]() From Wikipedia: "Crack affects the brain chemistry of the user causing euphoria, supreme confidence, alertness, increased energy – and a craving for more crack." (hence company's name Bottlehead), and with kit naming being a bit, ummm, edgy. For decades, Bottlehead has been providing wonderful DIY kits, usually based around vacuum tubes Win Bottlehead Crack 1.1 OTL Headphone Amplifier Kitī ottlehead and Enjoy the are giving away their easy-to-build Crack 1.1 OTL vacuum tube headphone amplifier kit ($315 on up depending on options).
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