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Mods for the CTM100

  • 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.
  • 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.
  • 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.

Carvin Corporation CTM100

Pricing & Availability

  • MSRP: $260

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Reviews & News

CTM100 Documentation

9 polar patternsCarvin Corporation CTM100

Multi-Pattern Tube Condenser Microphone

The Carvin CTM100 is an Alctron HST-11a, manufactured in China and available in the US and Europe under numerous brand names.

CTM100It is a 9-pattern tube mic with included power supply and shockmount. As do all the rebadged HST-11a mics, the CTM100 responds well to modification; search the web for “Apex 460 mod” to find relevant message-board discussions, or see our Apex 460 page for a starter list of common mods.

Because Carvin has not supplied frequency-response graphs for the CMT100, the graphs below are from the HST-11A.

Permalink: Carvin Corporation CTM100

Specifications

Frequency Response - OmnidirectionalClick Graph to Compare!
CTM100 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
CTM100 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
CTM100 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
300 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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