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Art tube mp studio pre amp

Funny thing, I wouldn't use it as a regular mic pre, yet I quite enjoy it for bass. I've used mine as a front end to warm up cold-sounding amps, as a level matcher, to buffer passive basses against the low (10K) input impedance of my Radial JDI, as a 1/4" to XLR adapter, as an active DI...

It's a great low-cost gadget to have in your gig bag.

There are a lot of negatives that can be said about it (low-voltage power supply, too cheap to be any good, doesn't do tube overdrive, tube is hard to replace when it dies, etc.), but I don't really care about what's under the hood. Even if the tube is just window dressing, it's a cool sounding little box, for very little cash.

As far as tube replacement goes, I've been using mine on and off for about 5 years, and it's still working fine on the original tube. Even if I broke it trying to replace the tube and had to buy a new one, it doesn't owe me anything, especially now that the Studio is down to about thirty bucks!

One caveat: I prefer the regular Tube MP, simply because the VU meter on the "Studio" goes nuts if you DI into a channel that has phantom power on it. Diming the needle with 48V doesn't seem to affect the tone, but it can't be doing anything good for the meter!
 
I have several that I use as well as a TPSII in the rack in the studio. For the 30-70 bucks the TubeMP pretty amazing device.
Used as a DI for bass or acoustic guitar, have used it as a plug in to add a bit of "tube" to a track. My wife uses one with her Naiant X-S mic one her horns for phantom and gain staging.