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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?

Gte357s  (Threads | Answers | This Thread)

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09-24-10: Rrog
I can't imagine the harshness you describe is coming from your Audible Illusions preamp. The best person to talk with regarding tubes for your preamp is Art Ferris, the guy that designed it.
Rrog  (Answers | This Thread)

09-24-10   Well ... harsh may not be the right word, but maybe due to s ...   Gte357s

09-24-10   You could try older 6h23eb (the ones with the rocket logo) i ...   Dekay

09-24-10   You will get much smoother sound with nos 6922 like amperex ...   Jig

09-24-10   Thanks. i am reading joe's tube lore page. he also recomme ...   Gte357s

09-24-10   Get some choice eh6922. try "the tubeman". he has ...   Theduke

09-24-10   Go inside the unit and make sure the cap dip switches are se ...   Audioconnection

09-24-10   gte357s, not for the ai special warning to audible ill ...   Jea48

09-24-10: Gte357s
I am very confused. So, the Amperex 6922 is not good? From the AI FAQ, it says:

"Only "mil-spec, low-noise" 6922, 6DJ8, 7308 or European E88CC tubes are recommended for use in Modulus preamplifiers.

Previous production Modulus M2, M3, M3a and L1 preamplifiers used Russian 6922 tubes. While quality and sonic performance of these tubes were excellent for several years it is unfortunate that current-production from the Sovtec/Reflector factory does not have the same sonic identity and a high percentage prematurely fail.

Current production Modulus M3a and L2 Preamplifiers use a Russian Military Type 6922 with "Grey Plates" and have excellent sonics and reliability.

Similar tubes which have different technical specs should not be used.

7DJ8 tubes require higher filament voltage and performance is marginal.

6NIP tubes should not be substituted as they require additional filament current and their use will compromise performance."

So, the 7D8J and 6N1P conflict with Joe's comment. And Joe said 6922 is not suitable? ... So, the remaining choice are:

6h23n, 6DJ8, 7308, E288CC ?

Gte357s  (Threads | Answers | This Thread)

09-25-10   gte357s, you have the l1 correct? 09-24-10: audioconne ...   Jea48

09-25-10 ...   Jea48

09-25-10   Thanks for the advice. i will try turn on the cap. it is c ...   Gte357s

09-25-10   Gte357s, the 6dj8, 6922 and 7308 are a family of tubes that ...   Tomcy6

09-25-10   Tomcy6: the siemens 7dj8's were still going strong in my fr ...   Dekay

09-25-10   Hi dekay, how does the siemens 7dj8 sound in the m3a? woul ...   Gte357s

09-25-10   Gte57s, i have been using an l1 for the past 3 years and cu ...   Aldoallen

09-25-10   Only tried 7dj8's in the phono section (1983 reflektor 6h23' ...   Dekay

09-25-10   Ps: experimenting with the internal switches and popping in ...   Dekay

09-26-10   I tried to turn on the capacitors, my immediate impression i ...   Gte357s

09-26-10   Greetings gte357s what amp and cd player speakers are you ...   Audioconnection

09-26-10   Gte357s, try using the "aux" input and see if you ...   Jebe1

09-26-10   Here is my system: sony blu ray player, maverick audio dac ( ...   Gte357s

09-26-10   I tried different combination. caps on with main 1 out - ha ...   Gte357s

09-26-10   You could have either a bad interconnect on one ch try swa ...   Audioconnection

09-28-10   Thanks for the advice. i don't think it is because of the i ...   Gte357s

10-01-10   I have had l-1 for about 7 years. one day the tubes went ba ...   Jefgerard

10-09-10   I finally got the electro-harmonix-6922 and listened for an ...   Gte357s

10-12-10   Need help again. i just got the new eh 6922 tube over the w ...   Gte357s

10-13-10   Greetings gte 357 trying to save money is sometimes tough. ...   Audioconnection

10-16-10   I emailed upscale audio, but with no reply. i am disappointe ...   Gte357s

10-16-10   that could be a dirty tube socket contact/s. with the pream ...   Jea48

10-17-10   I tried plug and unplug several times, and it is still there ...   Gte357s

10-18-10   Gte357s, sounds like the tube is bad. it can happen with a ...   Jea48

10-21-10   I contacted upscale audio and they agree to send me a replac ...   Gte357s

01-30-13   The amperex "orange globe" are an excellent cost-q ...   Infotrad

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