I have problem with my Tenor150 - advices welcome

Jaguar is not doing well, it's one of the anchors around Ford's neck. Their cars (especially at the lower end of line which is funny as they only make high end cars) are not competitive with other brands such as Audi, BMW, Mercedes, Acura, Lexus, and now Cadillac.

Go to Tenors website. Service will be available
at the end of the week.

Beemer, you must be speaking with past horrors in mind; otherwise, I find it amusing that you would be making such comments about Tenor when some of the expensive gear you own come from a company (Levinson) that recently experienced similar problems. I know, because when Levinson's parent company was undergoing restructuring and the factory was moved, I was selling a Levinson gear of mine at that time. I had a hell of a time trying to confirm warranty and such. Their dealers around the world were of no help as some of them had gear that required repair service and some of them were waiting for their orders, placed months before, to arrive. Contact between the company and its dealers were essentially cut off. In this instance, here's a big company with arguably a long track record for excellent service and reliability experiencing the same problems as Tenor did.

Mqg30, this probably won't help if what Fmpnd suggested is true, but have you tried adjusting your powercords and cables so that they are as free from each other as much as possible? And how loud is this noice? This isn't a case of tube noice right?

Howie brings up a good point. If ONLY a tube is bad (as opposed to a fuse or resistor in the audio board which took out a tube), then it could explain the intermittent noise and why it gets better over time. Clearly, it is in your amp as that explains why the noise occurs even when the preamp is disengaged and stops when the amp is in mute.

If it IS in the audio board, you will hear a distortion in the treble region especially when acoustic piano music is played.

One thing you could try is to get some spare 12AX7s (the tubes at the front of the amp) and swap them out. These are easy to find cheap tubes. Or you could also buy new 6H30s and/or the other tube (I think it is a 6N6P) and replace them all. If it is NOT the tubes, at least you now have a spare set.

It may be worth a try.

Fppnd,
Audiogon is definitely a place where you meet both the best and the worst but the best definitely worth it. Thks again for your time and advices.

This being said The Tenor team are very nice persons and i remain confident that they will be able to support me in one way or another. Long life to dreams.