I have an old turntable that has all four speeds (16-2/3rds, 33-1/3rd, 45 and 78), but alas when I tried to switch it to 16-2/3rds the gear shift had broken.
I looked up the place we took it to last time to get it fixed, but it was out of business. Well, there's always seeing what youtube has on fixing them. There were some videos on the speed changer and lubricating it. But, before trying to take it apart, I half remembered something about recording at one speed and editing it to another speed.
1. Hook up the audio from the turntable to your computer microphone input. My turntable output and computer input both took a standard 3.5 mm plug. If you have rca/phono jack outputs or a 1/4" stereo jack ouput get an adapter.
2. Download and install Audacity.
3. Open Audacity and hook up your turntable or record player to your computer.
4. Click on the red record button on Audacity, and start playing your record.
5. If you hear sound through your computer speakers and see sound waves on the Audacity screen instead of a flat line, you are good to go. If not, you need to fiddle with settings.
a. If you do not hear sound through your computer speakers, go to your control panel, select sound, and click on the recording tab. Make sure your microphone is enabled/ready. If not click on it, and select properties at the bottom right of the box. Click on the levels tab, and make sure your microphone slider is significantly above 0.
b. If you do not see sound waves recorded on the Audacity timeline, on the top right of the screen, second row, you will see a speaker icon next to a box and a microphone icon next to a box. Change between the options in the drop down menus until you get sound waves on your screen. (Note: you have to be recording to see the sound waves. So you will have to start [red circle] and stop [yellow square] recording as you change settings.) You can also set the input to stereo or mono in the last box.6. Record the cut your want or the entire side of your record in Audacity. (After you have stopped recording, you can edit out introductory or exit sound you don't want.) You might want to save it in case you make a mistake in the following steps--though you can usually undo changes under the Edit tab Undo command. You save by clicking on the File tab and choosing Export.
7. When the recording is as you want it, Drag the cursor symbol from the beginning of the recording to the end until the whole thing is selected/darkened. (If it's a long recording, you may want to click on the far right upper magnifying glass icon to have the whole project fit on one screen instead of dragging your cursor over minutes and minutes of recording.) Make sure you have gotten all of it, or part of it will still be at 33-1/3 rpm speed.
8. Under the Effect tab, click on change speed. For changing a 33-1/3 rpm recording to 16-2/3 rpm, enter -50.000 (make sure you include the minus sign) in the Percent Change box. Click on OK. Audacity will render the file to the slower speed.
9. Play part of the recording to make sure it is as you want it then save the file by using the Export command under the File tab.