NewTubes for my BeePre

[thdewitt]

Good Morning,  I just purchased two JJ 300B tubes new from Tube Depot.  I was wondering, one tube is very noisy.  Just a slight tap and I get a lot of ring and noise.  The other tube is very solid with no ringing or noise.  Do you think new tubes are guaranteed for this type of noise.  I mean, I don't hear much when I am playing music but I don't have the best ears either.  But one tube is definitely different from the other in regards to noise to the slightest of tapping.

thanks,
Tom

[Paul Birkeland]

300B's are typically not tested for microphonics, at least not the new production ones.  The lead rings help a lot if you have a sensitive tube.

[thdewitt]

OK, thanks, so I guess you are saying I can't return it just because I think it is noisy.  I do have some lead rings.  I guess I will just put them on.

Thanks,
Tom

[Horatio]

For what its worth, I have a BeePre (300B EH) and also Paramounts (300B Carbon Princess). My kit is not the most isolated, far from it, it sits on a wooden "sideboard" that in turn sits on a wooden floor. When I first turn the kit on I get some "Clanks" and "pings" as the tubes warm up. If there is no music playing and I walk heavily by, or for that matter you have a loud noise like a dog barking next to the equipment, the vibrations can absolutely be VERY audible, however if music is playing I rarely if ever hear anything other than the music.

On the BeePre with stock EH tubes I have rubber 'O' rings sitting between the BeePre and the tube to dampen vibrations and also Herbie Audio's HAL-O III-65 C Rings around the widest parts of the tubes.

I find that I only need those additional items on the BeePree tubes, I run with nothing on the Paramounts.

Hope this helps!