Hi I have a simple and silly question...

I've been using Pimsleur's Speak and Read Essential Russian and decided to throw in an online course for variety.
Well, on Pimsleur's when the say 'ты' , when saying something along the lines of 'you are young' or 'ты молодая' the pronunciation for 'ты' sounds like something along the lines of saying the letter 'V' (to my untrained ears at least).
But, on this other course online they sound like the pronouncing it by making a sound like saying the letter 'T'...

Can anyone clear this up for me?