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Mods for the HST-11A

• Fox Audio Research
  Brian Fox’ “C12” and “251” mods include a Peluso CEK12 capsule, upgraded capacitors, a Peluso BV11P transformer, and a selected 6072 tube. The C12 also incorporates a circuitry change to implement fixed grid bias voltage. The resulting mics’ frequency response shows a smooth +3dB lift at 10kHz, similar to the original AKG/Telefunken microphones.
  The “47” mod includes a Peluso PK47 capsule, a selected 6072 tube, and a choice of transformers (Peluso BV11P, Cinemag CM-2480 or CM-2461), upgraded electronic components, and circuitry changes to replicate some of the characteristics of the U-47.
• Microphone Parts
  The Apex 460 mod kit from Microphone-Parts delivers a comprehensive upgrade of the mic’s circuitry, resulting in a significant reduction in distortion, noise, and nonlinearities at a DIY-friendly price. The kit includes a full-color, step-by-step installation guide and suite of upgrade components including super low-noise parts from Wima, Nichicon, and Vishay Dale, plus a hand-selected Russian 6072 tube. Top it with a CK12 style capsule to get an affordable DIY ElaM 251.
• Advanced Audio Microphones
  Dave’s suite of improvements to the HST-11A (and its rebadged equivalents) includes replacing electrolytic capacitors with Mylar, bypassing unnecessary capacitors, changing the capsule to a Peluso (model varies by application, e.g. a CEK-89 provides U67-like response, CEK-367 provides U47-like response, CEK-12 for C12-like response), swapping the 12AX7 tube for at 12AT7 or 12AY7/6072a (providing a 6-8dB gain in headroom), and changing the output transformer (e.g. to a Cinemag CM-2480), resulting in a microphone “which will go head to head with a C12 or Tele U47.”
• Open Plan Recording
  Mark Chierego’s mod for the T-11A and clones (Apex 460) includes circuit and component upgrades such as transformer (Lundahl, Samar, Cinemag), tube and capsule (K-47 or CK-12 style). The mics are voiced with either the Neumann U47 or AKG C12 in mind.
• OktavaMod
  Michael Joly refits the Apex 460 with an MJE-K47 capsule within an elongated, single-layer headbasket, designed to reduce reflections and standing-wave coloration. The tube is replaced with a 6072a. Wiring and capacitors are upgraded.

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