[Big Bad Bob]

On 11/02/15 03:39, Peter Wieck so wittily quipped:
The first one immediately smoked its filament. The second one, after about 20 minutes, melted into a mess - almost cartoon-like. Everything inside the glass is tilted or rippled. The second one tested marginal before the melt, by the way.

Friends don't let friends use Chinese Tubes.

some are good, some are not, apparently. I've heard that Ruby buys
(some of) their tubes from China, then tests them before selling as
'Ruby'. But that might be a rumor.

need reputable sources, for sure.