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The Bock Audio model 241 is a high quality cardioid directivity studio condenser microphone utilizing vacuum tube electronics. Works well for all vocal or instrumental use.

Modeled after AKG's classic ela M251, originally built in the 1950's, this mic takes that platform and expands the electronics bandwidth. It utilizes it's own proprietary cable and power supply. The microphone's audio output is standard male XLR3, with positive excitation of the diaphragm at the front of the mic resulting in a positive voltage at the output XLR's pin 2. Audio output is fully transformer balanced. The 241 has a unique "HF cut" switch, which allows the user to effect a gentle rolloff of highs starting at 5kHz, ending with a 1dB cut @ 10kHz.

The Bock Audio 241 uses classic single triode circuitry with no additional negative feedback and high quality through hole components. Through hole components are more mechanically robust than surface mount and allow for worldwide ease of repair. Single triode mic circuits demand excellent capsules before them and excellent transformers after them, with a reward of low noise, simplicity of troubleshooting, and classic sound unachievable otherwise. The Bock 241 departs from the classic 251 of the 1950's in it's expansion of the bandwidth of the electronics, which has had it's low frequency cutoff frequency decreased from 80Hz to 30Hz, by use of a larger transformer. As well, the cathode bias cap has been increased to maximize warmth. The "HF cut" switch engages active, not passive shunt circuitry.

It is recommended that the user place the mic in it's shockmount on a stand and connect all the cables before applying power to the unit. Allow a few minutes for the mic to warm up.
  • Brite/ Normal switch for amazing versatility
  • Works well for all vocal or instrumental use
  • Tuned to work in a variety of studio situations
  • Transformer balanced output
  • Handpicked, individually tested capsule
  • Select "New Old Stock" EF814k tube is readily available
  • Low noise, low distortion
  • Specifications
    Patterns: Cardioid
    Frequency Range: 30Hz to 18kHz, +/-2dB
    Sensitivity: 19mv/Pa (-34dBm=94dB SPL)
    Equivalent Noise: 18dB ("A" weighted) 32dB (unweighted)
    Distortion vs.SPL @1kHz:
    112dB = 0.5% THD
    118dB = 1% THD
    129dB = 2% THD
    Impedance: 200 Ohms true transformer balanced
    Recommended load: 1.2k Ohms
    Dynamic range (maxSPL-"A"noise): 94dB
    S/N (94dB-noise): 76dB "A", 62dB unweighted
    Capsule size: 1" diameter, dual asymmetrical backplate CK12 type
    Tube type: New Old Stock EF814k
    Dimensions: 2.04" dia x 8" oal (52x216mm)
    Weight: 1lb 9.6oz (1.58lbs) =694g
    Shipping weight: 12 lbs
    Power Supply: P251 true linear, factory wired 115v or 230v operation
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