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RE: Atmasphere M-60's with Sophia 6SN7 tubes

I'm really happy with the 6 Sophia tubes in my M-60's. I'm not sure how many hours these tubes will last. Any idea anyone?
I was thinking of buying some spares, but they are expensive.

I found some Shuguang 6SN7-T CV181 tubes with brass bases that look very similar to the Sophie tubes and are a little cheaper. However, they have to be ordered from China.

Is perhaps the Shuguang the OEM for the Sophia tubes?
Has anyone tried these tubes?

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