Wavering speed. Hello, I own a Stanton STR8-20.  Recently, the speed has been wavering noticeably.  Not radically, but enough to make the records phase in and out of tune, which is extremely irritating.  I've tried removing and reseting the belt and such, but with no luck.  Is there anything I can do?

I am looking at pictures of the both the STR8-80 and STR8-100 and the both have the straight tone arm. So when you say an "s" arm I am a bit confused. The main part of the STR8-80 is the same as the 100. However the 100 has a different base to it, with additional controls such as lock(?) on it.

Having said that here is a guy that has converted the 100 to an S arm with pictures!
http://www.vinylengine.com/turntable_forum/viewtopic.php?f=18&t=90443

The Stanton STR8-60 is a direct drive record deck, so this shouldn't happen unless the platter was damaged but after a little research I found that the Stanton's can get a faulty chip which is meant to regulate the speed and therefore can make it spin erratically.

If you lower the tonearm to the record surface, and it just slides towards the center, chances are the stylus(needle) is either broken or covered with dust. Clean and inspect. For more information, please visit my website at audioserviceclinic.com. Thank you.

what speed is it set to?
33 or 45?
try using 45.
Also make sure the pitch adjustment is in the middle where it is supposed to be.

If the turntable has a belt drive, the belt probably has failed. If direct drive, the motor may have failed. Only a cheap turntable would have rim drive that failed. Your Stanton is not one of them.

You might have a preamplifier or mixer problem in your system that's unrelated to the turntable.

Try changing the needle and if that don't work check for any type of loose wiring

You need a turntable pre-amp, or a receiver with turntable inputs.. The turntable is functioning properly, until recently no turntable had this built-in. Search ebay for turntable pre-amp and you should be good.

you need to replace the Pitch controls. I'm presuming it is a sliding pitch control. Use the Red start stop lights that reflect on the rotating wheel. put the pitch in center 0. does one row of the dots on the wheel stay completely still.now just turn it up op down a bit until it starts to move the dots slightly. now watch the dots now while there moving. Do they fluctuate they should be smoothe. do this on both decks to find out which one is fluctuating.

You can use either type of input but you have to tell the Stanton which one.

I hope you realize that "Phono" isn't just a generic connection with a different name. It actually goes to a preamplifier (either in the Stanton or in your receiver) that not only raises the level of the signal but radically modifies its frequency respone via the RIAA curve (look it up) to make it normal.

A normal turntable without internal electronics would not have the LINE option.

1) There is a switch marked PHONO/LINE on the rear apron.

2) Select PH if you're connected to PHONO on your receiver or select LINE if you're connecting to a line level (non-phono) input, say, a soundcard or a standalone amplifier without a a phono section.