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Mods for the 460

  • Fox Audio ResearchFox 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 PartsMicrophone 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.
  • Open Plan RecordingOpen 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.

9 polar patternsApex Electronics 460

Multi-Pattern Tube Condenser Microphone

The Apex 460 is a Chinese-made tube condenser microphone, usually considered by the audio community to be a rebadged Alctron HST-11A. Lookalike mics vary in capsule and component details; see, for example, the ShuaiYin SYT-1200.

The mic’s large-diaphragm capsule is a 32mm Chinese K67 copy, advertised as having 5-micron membranes although in reality this specification varies without notice.

The mic supports 9 polar patterns, switchable from the power supply.


At $229, the Apex 460 is a phenomenal buy.

This is one of many AKG C12 lookalikes, and is possibly one of the best-known and most widely available; as a result, much work has been done by hobbyists to mod this mic, such as replacing the capsule and transformer and some components on the circuit board.

The Apex 460’s early claim to fame was its appearance in a teardown analysis by, proving that the mic was identical to the original and short-lived 2005 edition of the R-F-T M16 — a mic costing (at the time) significantly more, and which was subsequently replaced by a significantly nicer product at the same price.

Apex 460 circuit diagramDIY enthusiasts often modify the 460 by replacing the capsule, tube, transformer, or even individual components on the circuit board. However, no such piecemeal approach is likely to correct all the known deficiencies of the mic, such as:

  • Peaky-sounding capsule without corresponding corrective EQ in the circuit
  • Oversized EMI caps that cause an unwanted 2-3dB boost in the high frequencies
  • Insufficient QC of transformers allows significant variation in low-frequency distortion from one mic to the next
  • Capsule voltage is too high
  • Power filtering is insufficient
  • Tube gain is too high
  • Transformer ratio is incorrect

Although piecemeal component replacement can yield some improvement in the mic’s performance, it will very likely fall short of one of the full circuit replacement options described in the sidebar.

Permalink: Apex Electronics 460

The mic was released in 2003.


Frequency Response - OmnidirectionalClick Graph to Compare!
460 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
460 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
460 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (14 mV/Pa; 20 - 20,000 Hz)
Cardioid (14 mV/Pa; 20 - 20,000 Hz)
Bidirectional (14 mV/Pa; 20 - 20,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25mm
Capsule diameter: 32mm
Diaphragm gauge: 5 microns
200 Ohms (Low) Max SPL: 125 dB
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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