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Sovtek 6N23P-EV / 6H23P-EB NOS for AI Modulus 3A?

I need to replace the tubes of my Audible Illusions Modulus 3A phono stage. As I live in Europe I prefer to order them here from Tube Amp Doctor (TAD). TAD recommends their own TAD 6922 / E88CC Premium Selected or Sovtek 6N23P-EV / 6H23P-EB NOS.

Has anyone experience with Sovtek 6N23P-EV / 6H23P-EB NOS? Are these similar to the 6H23n-EB/6922 ones The Tube Store or Upscale Audio recommends?

Thanks much for your input
noortje
noortje OP
16 posts
 
In addition to my previous question: there is a hiss in one of my phono channels, which becomes louder when I turn up the volume. When I switch the tubes from left to right the hiss stays in the same channel. When I switch tubes from phono (6H23P-EB NOS) to line (new Electro harmonix EH) there is a loud and constant hiss in both phono and line (cd) but not influenced by volume control.
Is this a tube problem or something else?

Thanks
stereo5's avatar
stereo5
6,404 posts
 
Sounds like the hiss is coming from the tubes. I would order a set of tubes direct from Audible Illusions in Florida. Takes about a week to get them and they are perfectly matched for your preamp. There is no second guessing.
noortje OP
16 posts
 
Yes, thanks, I have thought about that too. It is just that I live in Europe, which means when I order tubes from the US an extra 25-30 percent is added to the price + shipping costs due to VAT and customs.
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