T25 Tube Compressor (API Select)

From API:

The API Select T25 is a classic 2-channel, FET feedback-style compressor/limiter with a Class-A tube output stage that utilizes a custom API transformer. Built with 12AT7WC and 12BH7 dual-triode vacuum tube, the T25 represents a new direction in API’s line of compressors. It offers the user a powerful and flexible feature set, including the ability for use in either dual mono or stereo mode, and is carefully engineered to deliver classic tube performance. The T25 excels at delivering the unmistakable sound of API and features our industry-exclusive Five Year Warranty.

The T25 Tube Compressor has several unique features that will allow you to tailor the sound of the compression in many different directions.

The patented THRUST® inserts a filter in front of the RMS detector that evens out the energy by lowering the energy in the low frequencies and increasing the energy in the high frequencies, so each octave has the same energy instead of each octave having half the energy as the one lower. This creates a unique compression effect that still reduces the overall gain, but the sound is much more punchy and the signal actually sounds much less compressed.