Need to adjust the speed every time I turn on turntable

If you are often fiddling with the speed adjuster, you may have created a "flat spot" in the 10 turn pot. Go to USAM, look for dealers on the right side and contact hyendaudio. He can help you with advice and parts. I replaced the pot and my Delphi II is dead stable now.

Only with Belt Drive turntables! 

Humans tend to confuse experience with reality. The human mind is designed for this as a modus operandi. A simple statement about a complex scenario, it is....

Hence the grating, constant, and unstoppable nature of forum arguments.

Agree, teo. We also tend to draw false relationships between a list of causes and a list of effects with no real data to support a connection of one to the other. But it makes us feel good to have a pat explanation in hand.

Found an interesting site that shows the entire North American grid in real time and the deviations as they occur. The bar graph above the map goes from 59.940 to 60.060 Hz and is color coded to the map. It changes more rapidly that I thought it could but not enough to cause us concern.

Type in FNET/Grideye
BillWojo