These tubes are just unbelievable. I used it to replace the preamp tube on my Marshall valvestate 8240 stereo. I replaced the original one with a JJ tesla tube a while ago and it was good, I liked it, but it is nothing compared to these. The sound is thick, warm with massive low end. It sounds very solid, consistent. I don't really know how to describe it. Well I love Metallica and metal music though I don't always play that kind of music. I think this is the closest to THAT sound I have ever heard my amp when you turn on the distortion. When you turn it up is when you can hear the massive difference there is no loss of tone all harmonics are there...
I have owned this amp for more than ten years and It never sounded like this. I was a bit sceptical about the price at first because I thought they were all the same and it was just all about electronics. I also read some reviews saying that Mesa tubes are just JJ tesla tubes with a printed Mesa Logo... well all I can say is that I recommend these tubes 100%
I've got a lot of rack preamps and I like experimenting with tubes so I've been meaning to give those tubes a try for a long time.
When I finally got my hands on some, I was amazed by how good they sounded - really powerful, quiet and with the best balance between gain, headroom, clarity and articulation I've heard from a modern day tube.
If you want to modernize your amp or preamp a bit with that heavy, tight metal sound and feel definitely give this tube a try - It is a bit pricey but I guarantee you won't regret it one bit!
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