No info about availability.
Tube VCA
Little brother of the double-wide 277 the 177 does in mono what big brother does in stereo.
The unique design of the M-series 177 delivers not one but two stages of high-gain (& high voltage) vacuum tube signal path without sonic compromise. Harmonics & Bass-Heavy Compression unique to valve topology are delivered with an economy of “hp” real estate (7.5hp!), meager power supply requirements & cost while maintaining Euro Format CV compatibility.
http://www.trogotronic.com/wp/2013/01/21/model-177-m-series-euro-module/
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These merchants probably sell this module. Huh?