Bendix 6106 burn-in behavior

@markusthenaimnut- If the tube is being used in the preamp, any abnormalities will be noticed on all sources. If your preamp has a tubed phono stage, swap that stage’s tubes, to see if they’re causing the problem. If not: reverse the interconnects from the arm/cart, to the phono stage and the imbalance should follow.

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.