STR 415 Single vs. Double Halo

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mule#1

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So here's my question. I thought I had a bad power tube but that was not the case. I started researching and have found there are 415's with single halo's. Mine have 2? What is the difference. I have read that the single are better for heat displacement. Is that true? Is the tonal characteristics the same? Thanks guy's!
 
The halos are called "getters", which provide the function of extracting stray gas particles from the inside of the tube once the inside has been sealed in vacuum. After that, they do nothing.
 
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