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Hello everyone

I recently bought a used Meinl Weston 2145 from Baltimore Brass. For some reason I'm having a hard time tuning the tuba. I'm either 20 cents flat or sharp. I switched mouthpieces hoping that it would fix the problem but it's still out of tune. Any advice on tuning this instrument. Also I switched from Bb to C. Thanks

My advice at this point would be to be patient. If you just switched to CC for the first time, it may take your mind a while to mentally adjust to the new harmonic series without "wanting" to hear a BBb harmonic series.

Throw the tuner away for a few days and try to play along with some drones. Your pitch will eventually settle in, but checking the tuner every 2 minutes will just depress you.
EVERY new horn I've switched to has come with a period of extreme sharpness, usually followed by a period of over compensation. Just use your ears and you'll be fine in no time.