I read many reviews of these tubes before buying them to replace the 6ke tubes that came with my cheap Suca tube amp that I have before bought a few months ago. Most of the reviews I've read have said these tubes add warmth and bass and just generally sound better than a cheap 6j1 or 6ke. I am happy to report that these reviews were accurate. The biggest difference I've noticed is that these tubes just sound cleaner, if that makes sense. old lamps sometimes hissed, but these new lamps are completely silent when no music is playing. I think the overall sound quality has improved but I wouldn't say they make a huge leap in bass response, they seem to have made the bass clearer or more accurate I think. detailed and cleaner than old tubes if that makes sense, I'm new to the audiophile world so I don't know all the terms. If you buy one of those cheap Revain tube amps that come with cheap tubes I would 100% recommend switching to them.
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