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Are 6SL7GT or 300B or 211 tubes noisy?

Posted by AudioDwebe on December 22, 2020 at 08:52:00:
I recently acquired an older Cary 805B which uses the tube compliment in the title. I find there's enough noise coming from the speakers (both equally) that I can hear it from my listening seat when no music is playing.

I'm not sure if this is just the way my 805 monos are or if one set of the tubes is contributing to the noise. I don't have any replacements available to me at the moment to see if any one set is causing the noise or not.

I do have two different sets of the 6SL7GT tubes en-route but as the other two tubes are a bit on the pricey side I'd like to get your collective experience concerning the tubes.

Are any of the aforementioned tubes known to be a bit noisy?

Thanks, and stay safe.

Mamoru