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RE: Defective 300B Tubes?

I contacted the dealer and they indicated that they will replace tubes under warranty.

The dealer wrote the following in their email "I have serious concern about your amp" and also stated "there is a very big chance that your amp is out of specification, as a result, caused the tubes to failure prematurely" and went on further to say "I would like to request you to have you amp check to see if there is any issue".

I understand the dealer's position as these tubes are expensive to replace, a 6SN7 tube ($100 per tube) failed about a month ago and now the 300B tubes ($1,200 matched pair) just a couple of days ago. If I were in their shoes I might also have a concern there may be something going on with the amp but... their tubes are the only ones that failed. I've had JJ, RCA, Sylvania, Ken-Rad and not had a single issue with any of them. That's not to say I never will as anything is possible but as far as I can tell the amp is working just fine with bias rock steady @ 120mA as per their recommendation (Cary advises 160mA), there are no strange noises, smells, etc... just wonderful music.

So my question is this... should I heed the tube dealer's request and ship the amp back to Cary to have them check it out, or are the failures nothing more than tubes behaving like tubes?

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