Tube buffer on TDA1543?

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Hi to all!

Did anyone tried to add tube cathode follower or something with tubes to the CS8412 and one TDA1543 dac after the IV resistors and coupling cap?

I am strugling to open my dac in highs for months and now I think I might try to add some tube buffer at the end. Maybe some White cathode follower or something. I could use 5687 or 6DJ8 for that.... Any ideas...
 
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