However, now that I re-read your comment, I will note that what you heard is NOT his glaring speech impediment. His mispronunciations are on
hard Ts and Ds, so you apparently have yet to hear him say one of Johnny Dollar's "MATHERS" (matters), or something from the year "nineteen-THIRTHY-two," or even RATHIO, instead of RADIO!
I'm wondering if your speakers are muddy, or maybe your hearing is bad, perhaps?