I have the WA33 and I'm running S EML 2A3's and wanted to buy their 5U4G to compare to my UE 596. I mentioned this to another member who also has the WA33 running the M EML 2A3's and their 5U4G. Just so happens we were both considering purchasing each others tubes blindly, so we decided to send each other our rectifiers mentioned to compare side by side for 1 week each. Both of agreed 100% that the 596 had a bigger sound stage, more speed, clarity and detail. The 5U4G sounded narrow, slow, darker and congested in comparison rison.Needless to say this saved me from buying the 5U4G, but he immediately bought the 596. I'm not saying that the 5U4G was bad, but nowhere near the performance of the 596 in our comparisons, or I would've definitely purchased it being I'm running EML's already.