I just put the original mac tubes back in waited 10 minutes and measured their temps. All were in the 250 degree F range--very consistent.
Then put new tubes back in but in different positions and after about 10 mins the tube that tested cold last time did again at 102 F. So the problem is moving with the tube. But the other three tubes were not terribly consistent either, with temps of 310, 356 and 373 F.
I then replaced the cold new tube with one of the factory tubes and left the other three in the same positions. As before, the factory tube stayed cooler than the new tubes at 240 degrees F. But the three remaining new tubes were now somewhat more consistent in temp but still showing the same progression. The tube that was 310 now 313, the one that was 356 now 328 and the tube that was 373 now 333 F.
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