TT-1100USB: How do I access the 78 rpm speed on the TT-1100USB? Press the 33 rpm and 45 rpm buttons at the same time. Product: TT-1100USB Related articles TT-1100USB: How can I connect the TT-1100USB to a device that doesn’t have a phono input? TT-1100USB: How do I properly balance the tonearm of my turntable? TT-1100USB: How do I connect my TT-1100USB to a computer?