Oliver Cardioid Microphone K7 (K47) Capsule

As part of our commitment to bring high quality audio equipment to the home and professional recording studio at an affordable price, we are happy to be able to bring to you this cardioid-only version of our loved Oliver microphone. Like the multi-pattern Oliver, this cardioid model is manufactured in our Australian factory. It also includes the BeesNeez K7 Cardioid Capsule.

Circuit Design

The Oliver Cardioid features our very own designed Beesneez E-Core single-spool transformer. The E-Core transformer in this microphone offers us the advantage of a low-leakage transformer and a small physical size. We have also found during our testing phase that E-Core transformers such as this one offer a lower susceptibility to core magnetization. When a core becomes magnetized, the lamination permeability is reduced. Many phantom-powered microphones that do not have carefully chosen transformers over the years become magnetized and the functionality of the transformer is drastically reduced.

The Oliver Cardioid utilizes only one half of the BeesNeez K7 capsule, which is a perfect replica of the K47. The other half of the capsule is only used for standing wave time delay, thus creating the cardioid pattern. 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.

The tube in the Oliver Cardioid is a JAN 5784WB Raytheon.

Sonic Characteristics

The BeesNeez Oliver Cardioid is a no-nonsense cardioid-only tube microphone that immediately becomes recognizable with its peers of yesteryear, such as the Neumann U47 and the Gefell UM57. The Oliver Cardioid has a well-distinguished warm and rich sound, gentle highs, boosted mids, and a linear bottom end. It will sit very well in a mix and will do most of the post-production work for you.

Build Quality

The Oliver Cardioid 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 Cardioid Tube Microphone
– Suspension Shock Mount
– BeesNeez Studio Series Cardioid Power Supply
– 7 Pin Microphone Cable (6m)



Capsule Type

BeesNeez K7 Microphone Capsule [K47]

Frequency Range / Sensitivity

Cardioid (20 mV/Pa: 20 – 17,000Hz)

Polar Pattern

Cardioid Only


200 ohms


Max SPL: 120 dB

Tube Type

JAN 5784WB Raytheon

Power Requirements


If you are interested in a flexible layby option, please email for details, veronica@beesneezmicrophones.com.au

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