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tube replacement

Best place to buy Tube replacement kit for LA-610

Hi there,

I'm starting to check for a place I can thrust to buy tube kits for my 2 x LA-610.
Affordable and good sounding (dreaming here ;))
They are both mk1 and were buildt around the same year but actually don't sound the same.
I guess they have different tubes or different wear on them.

Any suggestions ?

ART Pro Channel Preamp Tube replacements

I have had this ART Pro Channel in my studio for years now and I would like to breath some new life into it. I ordered and installed Ei 12AX7 Elites and TungSol 12AX7 [ NEW PRODUCTION] tubes only to find that both had issues. The Ei's had +17 dB noisefloor over baseline factory tube. The TungSol tube has a bad harmonic distortion at about 300hz. I like the sound of the Ei (noted as Telefunken like) but needless to say without the unwanted side effects. Does anyone here have any knowledge of tubes and this gear that could help. I am new to tube personalities and need to know info.

Need replacement tube

Okay - so my beloved K2 is apparently having a problem with the factory tube. For the first 30 minutes of a session, it sounds fine. After that, the mic starts to get very thin and muffled to the point where it eventually stops receiving/sending signal at all.

So, I'm looking for a replacement but I'm not good at which tube can replace what with minimal problem.