My cdp has , or had a seal on the lid in that if you removed it, voided the warranty. I removed the lid & rolled the tubes after 2 months. I was quite confident that if it worked fine for 2 months, it would continue to so for at least the next 10 months, (the balance of the warranty)_. 16 months later and 6 tube types later and all is well. I agree that the seller was a bit elusive,but as always it's buyer beware. If this pre is really what you want, then the tube compliment should not be a deal breaker in my opinion.