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Mods for the HST-11A
- 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. - 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 Fox 460 mod kit from Microphone-Parts delivers a comprehensive replacement of the mic’s circuitry, resulting in a significant reduction in distortion and noise, and an increase in sensitivity. High-frequency shaping is another feature of the new circuit. The kit includes custom PCBs, handpicked audiophile components, silver/Teflon audio wiring, and a full-color, step-by-step installation guide. Voice the mic like a U67, C12, U47, or ElaM 251. See also the new C12-style replacement grille option.
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Ningbo Alctron Electronics Co., Ltd. HST-11A
Multi-Pattern Tube Condenser Microphone
The HST-11A is the best-known Chinese clone of the AKG C12 design — a dual-diaphragm, tube microphone with 9 polar patterns selectable via a switch on the power supply. It has been rebranded and rebadged under numerous labels; see the “related mics” in the sidebar. The Apex 460 seems to be the best-known label. The Nady TCM-1150 is another well-known rebadged HST-11A.
These mics respond well to aftermarket mods, such as swapping the capsule, transformer, tube, and capacitors, resulting (to some ears) in a sound and response characteristics that rival the C12/ELAM251 — mics costing over $5000.
The spec for one such mod can be found in the Yahoo “Micbuilders” group; see the German C24 Solo Tube Condenser plan (you must first join the Micbuilders group).
Alctron mics are not available in the retail channel, except through the “rebadgers,” although there are stories online of people who have successfully imported small lots of Alctron-badged goods. Freight charges often equal the mic prices for small orders.
The Ningbo Alctron Electronics Co., Ltd. HST-11A is also known as: T11A, T-11A, HST11, HST11A.
Specifications
| Frequency Response - OmnidirectionalClick Graph to Compare! |
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| Frequency Response - CardioidClick Graph to Compare! |
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| Frequency Response - BidirectionalClick Graph to Compare! |
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| Pickup Patterns | Pads & Filters |
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Omnidirectional
(25 mV/Pa; 20 - 20,000 Hz) Cardioid (25 mV/Pa; 20 - 20,000 Hz) Bidirectional (25 mV/Pa; 20 - 20,000 Hz) |
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| Capsule Dimensions | Impedance | SPL/Noise |
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| Diaphragm diameter: 26mm Capsule diameter: 32mm |
200 Ohms (Low) | Max SPL: 120 dB Self-noise: 20.0 dB(A) |
| Weight | Length | Max Diameter | Interface(s) |
|---|---|---|---|
| 824g (29.07oz) | 240mm (9.45'') | 46mm (1.81'') |
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| Power Specifications |
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