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T-84 Circuit Kit For Sale

Original price was: $229.00.Current price is: $114.50.
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Estimated Delivery:
15 - 22 Mar, 2025
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Description

Style:

Transformer-coupled JFET

Distortion:

Moderate second harmonic

Noise:

Low

Character:

Saturated under moderate SPL

Sensitivity:

High

Circuit Frequency Response:

Flat

Polar Patterns:

Cardioid Omni (via internal switch)

Pad:

10dB (via internal switch)

 

The T-84 is a premium transformer-coupled microphone circuit kit, designed as a DIY alternative to commercial single-stage JFET transformer microphones.

The core design is Neumann s KM84 circuit. We ve taken it to the next level by implementing it with audiophile-grade components, a painstakingly selected and manually biased NOS JFET, and a custom-wound output transformer. We ve discarded the parts of the circuit that were doing more harm than good, and added a few bits that Neumann probably would have if they d had room inside the KM84 body.

The finished mic has high output, carefully contoured harmonic coloration, and great tone.

Pair it with our RK-47 capsule or RK-12 capsule to create a fantastic studio instrument.

Mod Kit vs. Microphone Kit vs. Microphone

This circuit kit is sold as a standalone unit because it works as a drop-in upgrade for numerous inexpensive donor-microphones; see a partial list below.

If you re interested in building this into a boutique microphone of your own, see our T-series DIY microphone kits, which include an unbranded mic body and chassis, a capsule, and this circuit kit.

If you love the idea of this circuit but can t build it yourself, see the finished T-47 microphone (built by hand, to order, in California).

Bundle Discount Option

For a limited time, get a discount on the LDC capsule of your choice via our LDC Bundle Discount plan.

Reviews

Read the SonicScoop review of the T-12 kit.

Read the Ask Audio review of the T-47 kit.

(Both the T-12 and T-47 microphone kits use this T-84 circuit.)

Compatibility

The T-84 circuit boards are known to fit:

Transformer

MP6.5, T6.5

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