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Weak voltage/power to pedal (Tech 21 VT Bass) through phantom

I am connecting my VT Bass deluxe via XLR to the mic input of an old Line6 Toneport UX2 soundcard, which can give 48V of phantom power as option.

If I connect the phantom and ground on my VT Bass without the battery inside, I get a very weak, distorted (in a bad way) feeble signal to my DAW and the led lights on the pedal can't even go red.
The phantom from the soundcard can effectively power a condenser mic, so I'm wondering why it's not doing its job with the VT Bass.

@tech21nyc do you know any reason why this happens? If I keep the battery in the pedal and the phantom engaged (like I'm doing) does it somehow help for power consumption or is all the juice automatically taken from the battery as the only source?

Did anyone else experience similar issues powering pedals with phantoms?

I have to admit I also have a spare phantom box somewhere and have not tried if it works with it so far, but I was wondering if it's the soundcard's fault and the mic can get away with the power it receives, unlike the pedal.
 
It sounds like the phantom power on the Line6 may not be working properly. I would try the spare phantom power unit you have. The battery merely takes over if phantom power fails.