With regards to solid state vacuum tube replacements such as the AMT Warmstone 12AX7 VT replacement devices, I love AMT SS products, but I don't give a crap about some scientific transfer function as a sales point! Do they sound good or not...kinda simple hugh kids. Anecdotes don't mean anything with out at least some comparisons to real vacuum tubes and the other related vacuum tube replacement devices already on the market. There is a company in the US that already has solid state vacuum devices being produced, sold worldwide, and four US patents. Does anybody know who this US company is and compared them to the AMT devices?

Quote from: THChrist on August 30, 2013, 10:55:43 AM
And what about these? http://www.jetcityamplification.com/2012/05/06/retrovalve-amber/