extreme bias difference with 2-channel H top

[BlueSky]

Unfortunately, I have more problems with my 2-channel H amps. I have two, a combo and a top. In addition to my loop problem with the combo I have a new problem with the top version. With that amp I have an extreme difference in bias readings between the two power tubes. When I got the top some weeks ago, it sounded not as good as the combo version. I checked the bias and one tube measured over 60mA and the other about 25mA. I thought one of the tubes were faulty, so I replaced them and biased them at about 35mA each. Today, I was not happy with its tone again and the OD channel had a noticable lack of power compared to the clean channel. Checked the bias again and one tube measured 35mA and the other 0mA (yes, zero).
I really seem to have bad luck with these amps. I will probably be able to fix the loop problem with the combo. But the bias problem with the top seems more serious. Both amps were new.

 

[László]

Why not send them back to PRS to be checked out and repaired, instead of trying to guess the problem yourself?

PRS amps are under warranty for 5 years. The only things not covered are the tubes and speakers. I don't understand, why aren't you taking advantage of that warranty?

If you don't make that happen, I really have to scratch my head, and say, that's on you.

It's not like they're cheap throwaway junk, PRS will fix them! Free!

 

[BlueSky]

I live in Europe and the 5-year warranty is only valid in the US. Anyway, I talked to the seller. I can return the amp and they will fix the problem.

 

[László]

I live in Europe and the 5-year warranty is only valid in the US. Anyway, I talked to the seller. I can return the amp and they will fix the problem.

Ohhh, that explains it. Well, that's great that the seller will take care of it.