2. amps-preamps
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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
dekay's avatar
dekay
5,351 posts
 
You could try older 6h23eb (the ones with the rocket logo) if they are still around. They are a bit softer sounding than the ones made @ Refektor (sp).

I used Siemens 7dj8 in the phono section of a Mod 3a, but never tried them in the line section. Maybe someone here has?

The 7dj8 was durable in the application and had a nice smooth/liquid sound (akin to old production Mullard and Amperex 6dj8's).
jig
160 posts
 
You will get much smoother sound with NOS 6922 like Amperex etc. As you are probably aware however, these preamps are tough on tubes and it is not cost effective having to replace NOS tubes every 6-12 months.You might consider some Herbie's Audio Labs tube halos and some different footers. These tweaks can smooth the sound out some.
gte357s OP
281 posts
 
Thanks. I am reading Joe's tube Lore page. He also recommend the Amperex white label PQ 6922. I found a couple posting on eBay, but it is not matched pair and are expensive, average to be $180. =(

I am very new to tube. So, all those Amperex tubes are old, and can only get from eBay? I tried search the tube store, but can't see any of them.
theduke
372 posts
 
Get some choice EH6922. Try "The Tubeman". He has cyro'd tightly matched triode pairs available.
audioconnection
1,270 posts
 
Go inside the unit and make sure the Cap dip switches are set to on
the amp you are using may better interface this way.
Also call AI with your serial number and they will
get you the right tubes for that unit
Best Johnnyr
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