I've recently done some extensive research, and the Shuguang KT88SC/Penta Labs KT88SC with three oval holes in the plates appear to identically match the VAC factory KT88 tubes. I own a quad of the Penta Labs, but I have not yet installed them. I do suspect that even if the tubes look and sound identical, the VAC factory tubes are cherry picked for the best of the lot. This is just a hunch, though. VAC KT88 Thread |
As I posted on the thread mentioned in Tvad's post, I have used a number of KT-88s on my PA100/100. I am assuming that tube and types/sound would be similer between my amp and the Avatar KT-88, or at least a guide to your question. I have now recieved my cyro'd Valve Art KT-88s after a long back order. I have to say they are exceptional sounding tubes. Very extended top to bottom and a nice hump/touch of midrange lushness and bloom. Much better than the Valve Art non-cyro and EH I have been using up to this point. |
Interesting findings. I have tried JJ blue glass, VAC stock tubes and now some Golden Dragons. So far I think the best are the Goldn Dragons(I'm not sure of the vintage) but I have found that the VAC is the least susceptible to tube rolling of any amp I've had. It just always sounds fantastic no matter what tubes are in it. Don't get me wrong as there no doubt are subtle differnces but either the stock tubes are really good or my "upgrades" aren't really that. I have heard dramatic differences with altering 12au7's in other amps but not so much with the VAC. Always interested to hear what others find though. I have seen some talk about the Valve Arts on AA. hmmm.... interesting.... |
