FLEA Microphones M 251

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Built to Order, Item is Custom Built Then Ships Quickly

Stock Item: Ships from our shelf quickly in almost all cases when ordered before our ship cutoff times.

Direct Ship: Non-stock item, but normally ships quickly from the manufacturer or alternate warehouse.

Built To Order: Item is custom built per the options chosen and quickly shipped out upon completion.

More On The Way: The manufacturer is experiencing delays, but we'll ship quickly upon arrival.

New Item: We have this on order, the manufacturer hasn't shipped but you'll be in line upon arrival.

Visit our Shipping Page for cutoff times for FREE (USA), UPS, USPS or FedEx.

Visit our Returns Page for info on non-returnable, special order non-stock items.

An absolute beauty, the original 251 is considered one of the best microphones ever made!

The FLEA M 251 is the clone of this beauty.

Yes, it took quite a long time, but the complexity of this microphone demanded it, along with a great deal of effort and deep enthusiasm in the development process.

Just an aside: if you weren't passionate enough, the careful cloning of all the mechanical parts could drive you insane.

But despite the difficulty, everything is perfected.

Finish Options

  • Vintage RAL 7032 (standard)
  • White (must specify during ordering)

And a few things have actually been improved:

  • All important connecting parts, pins and terminals are gold-plated
  • The wiring based on Andreas Grosser's latest update gives this amazing-sounding Microphone less noise.

The other important parts of this microphone are:

  • Tim Campbell CT12 capsule - the precise sound of the CK12
  • Carefully selected 6072A tube
  • Our identical T14/1 transformer clone


  • Frequency Range: 20 Hz - 20 kHz
  • Polar Pattern: Cardioid, Omnidirectional, Figure-8
  • Sensitivity: 18 mV/Pa
  • Output Impedance: 200/50 Ohms
  • THD at 1kHz at 1Pa: 0,15%
  • Maximum SPL: 132 dB
  • Self Noise: 10 dBa
  • Capsule: CT12 (Tim Campbell)
  • Tube: 6072A
  • Transformer: Flea T14/1
Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.