These are a well made tube like other EHX stamped stuff I have used (I have only had one bad one and that was a microphonic 12ax7eh). No rattles out of the box unlike some JJs I have had. They are punchy and add a nice rounded feel to a driven tone when you push them hard, almost like a really mild fuzz but creamy and not brittle like a Sovtek can get. I like them a lot. El84s all seem to rattle a lot in a combo but so far no issies with these.