Let me tell you my experience with them. Bought a pair from a very reputable dealer, got them in and put them in my Maz 18....sounded beautiful with warm creamy overdrive and chime for days. This lasted about 5 minutes and one red plated. Sent them back to the dealer and it took over a month to get a new pair returned to me. Second set: same scenario in my Maz but they lasted about 20 minutes this time until one of the tubes red plated again. Back they go and I'm still waiting for a new set....3 weeks later. Each time that this happened I popped in an old set of JJ's that I've had for about a year and have abused in my other 18w and they are still going, albeit not as good as they used to be. If I could ever get a set that was reliable it would be awesome, tonally they were much warmer and creamier than the JJ's.