Tube hybrid expander

[tardishead]

Does anyone know anything about these units. I have seen half a dozen crop up on evilbay over the last 3 years.
It looks like the sidechain is SS - could be fast?

http://www.ebay.com/itm/2-CLONED-AUDIO-COMPRESSORS-LIMITERS-EXPANDERS-NICE-TUBE-HYBRIDS-6L7-6J5-6SJ7-6H6-/370660153329?pt=US_Signal_Processors_Rack_Effects&hash=item564d1117f1

 

[Kingston]

very high quality builds too, wiring and parts selection. could be part of some prototype batch that never amounted to a full commercial run. I wish someone here would snatch them up and then its dissection time.  ;D