Oliver Fet Condenser Microphone K7 (K47) Capsule

The music industry today does not just revolve around million-dollar studios and high budget equipment. Many BeesNeez customers have asked us to manufacture a no-nonsense affordable yet not gritty and spitty microphone, that has a low cost price. With the BeesNeez K7 [K47] microphone capsule, you will be getting the U47 fet-like frequency response in a well-packaged, transformerless microphone. Now you can own an all-Australian-made microphone at an affordable price. No other microphone in the market can boast the performance or origin of the Oliver Fet.

Circuit Design

The capsule in the Oliver Fet is the BeesNeez K7 capsule, which is a perfect replica of the K47. This is a single backplate capsule made famous by Georg Neumann & Co. The difficulties in reproducing a capsule like this is that it has both blind and through holes. The correlation between these holes controls the pattern via absolute distance and is quite mathematically complex due to having only a single backplate. Other capsules with two backplates are much easier for pattern control in the design phase as the standing wave end point is a solid object [the opposing backplate] rather than a moving diaphragm. The diaphragm is 6 micron DuPont mylar that we personally frame, sputter, tune, and fix to the backplate, which we also wholly manufacture.

Sonic Characteristics

Sonically, the Oliver Fet is reminiscent of many tube mics from the 1950s, i.e. the U47. Its transformerless fet design creates a very fast and snappy sound, but still captures the sound of its vintage counterparts with a single backplate microphone capsule design. Electrically and acoustically, the Oliver Fet microphone is of a superior build quality to many microphones made today. The end result is a phantom-powered electronically-balanced fet microphone that is optimised for the new low voltage bias version of the BeesNeez K7 capsule.

Build Quality

The Oliver Fet body tube is made from a single piece of cold-formed 380 grade brass tube. We love using the 380 grade brass tube in this particular microphone because the high copper content in the 380 tube provides excellent rejection and shielding. After machining the body, it is sent to a local powder coater for completion. The base, like the body tube, is made from 380 grade brass. However, this time it’s a solid brass round that we cut and form in our very own 8-axis CNC turning center. The head grille is integrated in the body tube, by cutting windows into the body tube.

What’s Included:
– Oliver Fet Condenser Microphone
– Suspension Shock Mount


Capsule Type

BeesNeez K7 Cardioid Microphone Capsule [K47]

Frequency Range / Sensitivity

Cardioid (20 mV/Pa: 20 – 20,000Hz)

Polar Pattern

Cardioid Only


150 ohms


Max SPL: 120 dB

Power Requirements

Phantom Voltage 48 4v

Bang Bang - Sian Evans (Raw)

Bang Bang -Sian Evans (Processed 3-5db Compression)

Acoustic Guitar