Bottlehead Forum
Bottlehead Kits => BeePre => Topic started by: thdewitt on September 12, 2015, 05:27:38 AM
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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
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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.
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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
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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!