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Jim, returning back to the subject of tube testing….

I do not know if you have seen my most recent obsession; the idea of driving my Macondo with 1.8W of a single 6E5P:

http://www.goodsoundclub.com/LatestPosts.aspx?ThreadID=4241

So, what I learned is that all 6E5P, regardless of vintage and lever of being used up have the same 30 times gain. So, it is a drastic improvement over the very uneven gain of 6C33C. Still, all 6E5P have different ability to produce current – the stupid Russian tubes! So, sine I know the exact operation point for this tube and sine I will have the adjustable base for each channels of the single stage Melquiades then what might OBJECTIVELY indicated to me the life span of the 6E5P? The cathode emission? The transconductance? The use of getter? The darkening of the glass? Where would be an objectively correct point when a tube consider “gone”: 10% less of cathode emission, 30% less of cathode emission, 50% less of cathode emission? Is it wary from tube to tube and some of the sound fine with 50% less of cathode emission and with less bias?

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