Brand Name: Warm Audio
Model Number: WA-2A
Descriptions:
'2A Style Optical Compressor
No plug-in or other compressor type quite compares to the warm, forgiving, fluid qualities of the classic '2A optical compressor. For decades, the renowned '2A style circuit has become the go-to device for seamlessly handling vocals, bass, and a wide variety of other instruments and program material in an effortlessly smooth way. Releasing the WA-2A would be for nothing if it wasn't affordable. Since the start of Warm Audio, Warm has striven to give an unprecedented value to their customers, but putting high end audio within the reach of more people than ever before. This philosophy drives everything they do, and every product they offer.

Premium Components
The WA-2A is a high-voltage, Class-A opto-compressor, utilizing large-core CineMag USA Transformers, four premium vacuum tubes, and the legendary Kenetek opto-cell – considered by many to be the world's finest.

A Four Tube Operation
The WA-2A operates on four tubes: two 12AX7s, one 12BH7, and one 6aq5 (or 6P1J). We proudly use Tung-Sol and Electro-Harmonix brand tubes in the signal path, which sound very “open” and LARGE. All four tubes are socketed for easy swapping and replacement.
 
Features:
Transformed-balanced, high-voltage, optical tube compressor built in the classic "2A" style
Up to 40 dB of gain reduction
Up to 40 dB of make-up gain
CineMag USA input and output transformers
USA-made Kenetek opto-cell attenuator T4-style module
Socketed construction to allow retrofitting of other opto-cells and tubes
Tung-Sol and Electro-Harmonix tubes including two 12AX7s, one 12BH7, and one 6P1
Fully discrete signal path
Variable pre-emphasis allows for reducing high frequencies in the sidechain
Supports stereo linking via 1/4" TRS
Balanced XLR and 1/4" TRS I/O
VU meter with selectable display of gain reduction or output at
+4 dB / +10 dB above the meter reading
Rear-panel meter adjust function for easy VU calibration
Occupies 2 RU of rack space