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Well, it is getting interesting. I was able to make my Hillock TV-2 tester to test the 6C33C. I spend a few hours to filtering the plate voltage and replacing a couple resistors to 50W instead of the 5W. The plate coils in TV-2 is 100mA but it looks like it perfectly able to handle 200mA (burned some resistors the were replaced with more powerful). I was cooking a half of 6C33C for 30 minutes at 150mA and then inspected the testers. It looks like nothing got dramatically overheated. So, it looks cool so far.

The good part is the now I can measure worn of each half of the 6C33C. The bad part is that they all very deferent. This crappy damn Russkie’ss tubes, even when they new, very seldom measure the same cathode emission. Among the 12 new tubes that I have only one had the same mutual conductance between the half, the rest has 10%-25% of difference. The tubes that did measured identically were two tubes that were use with it’s bath hale in LF channel of Super Melquiades. Now I have to learn how to measure the gain of those 6C33C in this tester….

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