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Mods for the HST-11A

  • Microphone PartsMicrophone Parts
    MicParts offers a full suite of upgrades for the Apex 460 (and all other rebadged Alctron T11A microphones): C12 style grilles, upgraded K47, K67/K87, and CK12 style capsules, and two different circuits.

    The “Fox 460” circuit is a massively upgraded CCDA topology, including a selected 6072 tube, custom-wound transformer, and a third-generation circuit made with the best parts on the market.

    The “V-251” circuit is a single triode design with a T14 transformer.

    Read more about Apex 460 upgrade options.

Ningbo Alctron Electronics Co., Ltd. HST-11A

Pricing & Availability

  • MSRP: $80


HST-11A Documentation

9 polar patternsNingbo Alctron Electronics Co., Ltd. HST-11A

Multi-Pattern Tube Condenser Microphone

The Alctron HST-11A is a Chinese tube mic that has been rebranded and sold as the Apex 460, Carvin CTM-100, BadAax T11-A, Nady TCM1150, and probably others.

It is often referred to, incorrectly, as a “clone” of the AKG C12. But in fact it differs in nearly every way from the C12: it has a 32mm K67 rather than 34mm CK12 capsule, a CCDA (dual triode) circuit rather than single triode, and often a 12AX7 tube instead of a 6072.

See also the ShuaiYin SYT-1200 (see link in sidebar), which shares a basic circuit design and body style, but adds switches for HPF and pad.

The performance of these microphones depends largely on component quality, which varies. Some capsules are bright and thin. Some, less frequently, are more balanced. Some of the transformers work as expected, while some have very high distortion.

Due to the generally poor quality of components, these microphones tend to respond well to aftermarket upgrades, although mic owners must be wary of combining “upgrade” suggestions culled from the Internet, as there are many mod recipes that are incompatible with others. One key distinction is that some upgrade ideas retain the series-triode CCDA topology, while some disable the second triode in favor of restoring the mic to a true C12 style circuit. Regardless of one’s favored topology, superior results require that the entire circuit be designed toward a single design.

Alctron T11A CircuitSpecial caution should be used when replacing the mic’s transformer, both because that’s rarely the biggest problem in the mic, and because the most commonly recommended aftermarket part has entirely the wrong turns ratio for the stock circuit. (The stock circuit works best with a 6-7:1 ratio, whereas the popular “upgrade” transformer has a 10-11:1 ratio; that component reduces circuit output unnecessarily.)

The Ningbo Alctron Electronics Co., Ltd. HST-11A is also known as: T11A, T-11A, HST11, HST11A.


Frequency Response - OmnidirectionalClick Graph to Compare!
HST-11A Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
HST-11A Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
HST-11A Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (25 mV/Pa; 20 - 20,000 Hz)
Cardioid (25 mV/Pa; 20 - 20,000 Hz)
Bidirectional (25 mV/Pa; 20 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
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'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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