A completely different animal than the TAD 6L6GC-STR. That’s not a bad thing and shows that the company is really working on developing unique products. A completely different plate structure than their other 6L6. These are short bottles just like the American 6L6WGC but they chose to use a proprietary plate structure. Sonically, I found these to be brighter than the GC version and tonally similar to a G.E. black plate 6L6. I have a customer with a 1962 Fender Concert amp with 4 10” Oxford speakers. I have tried just about everything in stock to make this amp sound good. Previously the only thing that made us both happy was NOS G.E. Alas, one of the tubes died and so did my stash. I tried a lot of tubes and had left the TAD until the end because it didn’t have the look this customer was used to. To my surprise I tried the TAD 6L6WGC-STR and it was magic. I got the same tone as the old G.E. tubes but the biasing was colder than what I used for NOS tubes in the past, closer to 55% or about 17 watts at idle as opposed to 20 – 25 watts (70-80%) that most people seem to like for rock or blues.