2. amps-preamps
  3. 1285350105

tube choice for Audible Illusions L1

I have a Audible Illusions L1, and it has humming noise on the left channel. I suspect it is the tube. Also, I would like to smooth the sound a bit more. The recommended and current tube I have is 6h23neb. However, I have someone previously recommends Svetlana 6n1p. I would like to try it out, but it says on the AI FAQ that "6NIP tubes should not be substituted as they require additional filament current and their use will compromise performance."
What does compromise performance means? Does it mean the tube life will decrease? But it won't do any damage on the unit, am I correct?

Also, from the tube store, I can't specify the brand. Is it important to order a specific brand?

Besides the 6h23neb and 6n1p, is there other suggestion that will help smooth out the sound, or make it less harsh?

Thanks.
gte357s
gte357s OP
281 posts
 
I emailed Upscale audio, but with no reply. I am disappointed. I even pay extra $10 for the premium, and it says on the web site that this is a tube they would recommend.

But BTW, can I tell if it is the tube comes defective, or it failed prematurely? I hear intermittent hissing sound.
jea48
4,453 posts
 
I hear intermittent hissing sound.
10-16-10: Gte357s

That could be a dirty tube socket contact/s. With the preamp turned off try unplugging the tube from the socket and plugging it back in a few times to clean the socket contacts.
gte357s OP
281 posts
 
I tried plug and unplug several times, and it is still there. And it is not intermittent anymore, it is a continuous hissing sound. I also switch the left and right tube, and the hissing sound move with the tube. By this, I can confirm one of the tube failed. The other is still ok. So, usually, a tube won't fail this fast, is this covered under any warranty?
jea48
4,453 posts
 
Gte357s,

Sounds like the tube is bad. It can happen with a new tube.... Call Upscale Audio, 909-931-9686. Explain to them the hiss moved from one channel to the other as the bad tube was moved.

You may have to pay a shipping charge. Can't say for sure.
gte357s OP
281 posts
 
I contacted Upscale audio and they agree to send me a replacement tube. Excellent service, way to go, Upscale.
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