Each guide provides a structured, end-to-end reference, schematics, BOM, and errata included. 24/7 support with Mike AI bot, always available when you need it.
The most thoroughly documented build in the collection. Fourteen years of community refinement, twelve errata corrected, three transformer options validated.
The transformer‑coupled FET sibling to the U47 tube — punchy, articulate, and the broadcast workhorse of the 1970s.
The bridge between the U47 and U87 lineages — EF86 pentode front‑end, transformer output, switchable polar patterns.
EF800 pentode, AMI BV08 transformer, dual-supply PSU. Reed relay pattern switching, dual BOM.
The Austrian icon. 6072 / 12AY7 tube, CK12 brass capsule, Cinemag CM‑13114 transformer.
The German tube classic — 6072 dual triode, BV12 transformer, CK12‑style capsule. Lush, controlled, unmistakably airy.
The most musical Neumann ever made. Puck‑style remote pattern switching, MS47 capsule, BV8 transformer.
The grail. VF14 tube, M7 capsule, BV8 transformer. Build thread under research — content forthcoming.