Bendix 6106 burn-in behavior

Thanks to both of you for your responses. Here's a little more information - 
The builder of my preamp has advised that the tube is faulty. Replacing the Bendix 6106 with the stock tube immediately eliminated the problem, and the seller has issued a complete refund.
Regarding the topic of burn-in, the tube originally functioned with no problems. I claim no expertise with respect to burn-in of this tube; quite the opposite. I had read on this forum another individual's experience with this type of tube in an earlier version of my preamp. I based my expectation on the need for burn-in on his comments.
However, the phono stage in this latest design is extremely resolving and that might mean that this tube is no longer a good match for the preamp. From here on out I plan to stay with the stock tubes.

Hi Mark, Does Mick of Supratek endorse the Bendix 6106? I was under the impression that he does not. Can someone correct me if I'm wrong?
Thanks, Tish

Hi, I did a search and it looks like they are good to go (the 6106) although I did see a post that claimed you shouldn't use it in a Cabernet.
Thanks again, TISH

@roberjerman is correct- unless the idea of 'burn-in' is extended to the idea that some percentage of parts will suffer 'infant crib death' due to manufacturing defects, as is apparently so in this particular case.

Glad you got it resolved. Of course, being the highest-gain, and earliest, circuit of a preamp, a phono stage would be the most(noticeably) affected, by a misbehaving rectifier. How basic! I was hoping; getting old would take longer!