Favorite 300B: Sophia vs KR

OK, my vendor for the Shuguang BTs says he has 2 quads; one w plate current 48 mA, one w plate current 80 mA. Any thoughts on which might be best in terms of reliability/compatability w the Ren circuit. Kevin said he needed more info on measurement conditions which I am trying to obtain. Totally ignorant on any of this "ee" stuff so any help you can provide would be greatly appreciated.

80 mA.

Pdrehr- Got a response back from Kevin saying

We have one customer running the Treasure tubes in a pair of Signature 140's. If I remember correctly, the tubes labeled in the 70's will occasionally trip the 300B Sentry protection circuit. If that is correct, then perhaps the "48" tubes would be the better bet.

Comments anyone, before I order? Not trying to start a war, I am truly ignorant on these matters.

I`d follow Kevin`s advice he knows his product`s characteristics best.

I will heed Kevin's advice, unless there is a strong reason not to, but Kevin was a little equivocal saying that the measurements needed to be put into context for him to be sure. The vendor has an impeccable reputation for honesty (even against his financial interests) and knows way more than I do about these matters. He said that in his experience w Shuguang and Psvane products:

cathode bias amps do well with the higher plate current tubes, and fixed (manual) bias amps generally like the lower plate current tubes. I've sold across those recommendations a ton of times, but if I saw any trend in regards to plate current, that was the one.

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So I thought I'd put it out there to get comments from people who understand the concepts behind this issue, which I most emphatically do not.