Mercenary Audio
InnerTube Audio U87 Tube Retrofit kit





Imagine being able to take the complex, veiling circuitry of the infamous U87 and completely remove it, replacing it with a minimalist high voltage tube amp. Imagine being able to REVERSE the modification in under 60 seconds…not that you’ll ever want to. This is what you get with the InnerTUBE Audio “Tube 87” Retrofit. We would love to compare the sound of this Frankenmic to something else…but with the exception of the Mag Mic , there is nothing else that compares.

INATUBE List $0.00

Mercenary $1,500.00


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Turn your U-87 from standard solid state, into a true tube microphone. The change over is accomplished quickly and easily by the user in one (1) minute or less.

This retrofit is non-destructive, and can be reverted back easily if one should ever want to use the retrofit at another studio. There are identical retrofits for both the older standard type as well as the newer a-i, with equally impressive results.

As one U-87 owner who utilizes the retrofit in a variety of applications said "I used to like how my solid state 87 sounded until I heard it tubed. Now because of the added sonic dimension and clarity, I won't use it unless it is tubed".

The retrofit has been a consistent winner time and again, in critical blind listening tests between itself and top world class solid state and tube microphones. Those who have conducted these microphone "shootouts" are like yourself, professionals in the audio field. They have been surprised and are greatly impressed when they learn the microphone they chose as best sounding overall is the retrofit.

The Retrofit Kit includes:

The internal Tube Retrofit pre-amp assembly

Power Supply with continuously variable pattern pot

Cables for the mic (7-pin), and power supply (Grounded AC)

Instructions for change over

All components are pre-assembled and ready for installation.





INATUBE List $0.00

Mercenary $1,500.00


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