I have the Mac 353 which might be out of your price range. I put in some PSVANE Horizon tubes and I concluded these are the tubes that should have come with the amp. Tried gold lion and they were not as good. The Psvane and better bass and clarity. If you were thinking Solid state I highly recommend Hegal which I also own. Believe it or not the LS50 loves current. I own a set of those too. You can get the PSVANE Horizon from amazon and if they don’t work out for you, they can be returned.
