BlueTube phantom power lacking juice?

[easlern]

Hi guys- I've got a BlueTube preamp that I'm suspicious of not having enough phantom power. The pre works fine with mics that don't need phantom power but when I plug in my SM-81 (uses +48v phantom, which the BlueTube has a button for), the sound on the mic cuts out after 20 seconds or so. The mic tests fine on another pre. When I turn the pad on, the mic doesn't seem to cut out but I don't want to constantly use the pad. Am I correct in guessing it's probably a problem with the pre, and has anyone had a similar problem before? I have yet to try using a different outlet for the pre. Could that help? Thanks for any advice!

 

[mshilarious]

The SM81 is fine with less than standard phantom, so I would suspect something with the preamp is defective. Have you tried another condenser mic with the pre?

 

[easlern]

My other condenser has its own power supply. I have a spare TubePre that I will try it on. I've been using both channels of the BlueTube at the same time without a problem, so the phantom power use is the only variable I can think of.

 

[easlern]

The TubePre seems to power the mic just fine. Guess it's time to see how good that "power play protection" (or whatever it's called) warranty is at Guitar Center. . .

 

[timboZ]

Did you try a different mic cable. You may have an intermittent short.

 

[easlern]

I actually used the same cables (in and out) with the BlueTube and the TubePre. I think I just got a bum BlueTube.