Hi everyone, this ad is for a pre-built Bottlehead Mainline. This is an end game, TOTL amp. This is the 120V Mainline for use in North America (Canada & US). It is highly modified to maximize performance. Costs of parts (in USD) and sound changes as follows: Core components in this build: > Bottlehead Mainline - $1200 US - Price of stock kit > Mundorf Supreme coupling caps (10uF each) - $120 US -- Upgraded to give a nice clear sound, neutral, open sounding - gives big soundstage depth! Very fast and dynamic capacitor. > TX2575 Naked Z-foil Resistors on the input path, 6C45 tube anode, and key regulation sites - $200 US -- These are the best resistors that can be purchased. I had Texas Components custom make these at the precise values I was looking for. These resistors don't add or take anything away from the input signal. Give the most clear, precise, and un-colored sound possible. These are the lowest distortion resistors available today. Precision matched to 0.01% of their rated values. Incredibly low thermal drift. > High frequency cylindrical ferrite beads placed throughout (especially on all power carrying paths) - $60 US -- These give power filtering that further increased the blackness of the background. Increase in overall transparency of the sound. Also has the following upgrade: -Mills Wirewound resistor replacing metal oxide resistor in high voltage path. Extremely low noise resistor to further reduce power supply noise. Total price: $1340 US, buyer pays shipping and Paypal fees Note: Has a small cosmetic flaw of a very small bend in the aluminum near the right side heat vent. Does not affect functionality whatsoever but price has been lowered for cosmetics accordingly.