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Pins are not supposed to be bent. It may have been caused by its removal or how it was inserted. Best to verify by feel that the pins are aligned before pressing the tube into place. If they are not straight, it becomes more difficult to get the tube installed. Never force a tube into the socket. Sorry you had issue with the JAN/Phillips 12AT7WC tube. Where did you get it from? Considering the fire Shuguang had a few years back, 2018? whatever stock of the Chinese tubes were left, I am sure that inventory has been long gone. Mesa replaced the Chinese 12AT7 with the TungSol 12AT7. Not just for keeping up inventory but more so due to performance issues. I had inquired why the change with the Mesa TT800 as it came stuffed with the Tung Sol 12AT7. Someone from Mesa in one of the facebook clubs for Mesa bass amps, claimed the Chinese 12AT7 was not very reliable. The Tung Sol 12AT7 had more stability. Sure, fine in the BASS amp but they were super bright in the TC amps. I actually favor the Chinese 12AT7 in the RA100. TC is a bit different. It was the TC100 that I had issues with and much to what you described. The JAN/Phillps 12AT7 worked well and has been in there since I first mentioned it.
Pins are not supposed to be bent. It may have been caused by its removal or how it was inserted. Best to verify by feel that the pins are aligned before pressing the tube into place. If they are not straight, it becomes more difficult to get the tube installed. Never force a tube into the socket.
Sorry you had issue with the JAN/Phillips 12AT7WC tube. Where did you get it from?
Considering the fire Shuguang had a few years back, 2018? whatever stock of the Chinese tubes were left, I am sure that inventory has been long gone. Mesa replaced the Chinese 12AT7 with the TungSol 12AT7. Not just for keeping up inventory but more so due to performance issues. I had inquired why the change with the Mesa TT800 as it came stuffed with the Tung Sol 12AT7. Someone from Mesa in one of the facebook clubs for Mesa bass amps, claimed the Chinese 12AT7 was not very reliable. The Tung Sol 12AT7 had more stability. Sure, fine in the BASS amp but they were super bright in the TC amps. I actually favor the Chinese 12AT7 in the RA100. TC is a bit different. It was the TC100 that I had issues with and much to what you described. The JAN/Phillps 12AT7 worked well and has been in there since I first mentioned it.
