To be honest the only difference between these two clippers are the prices.
The Power Line comes with a #00000 blade and the Classic comes with a # 000 blade.
They take different blades, the housing is shaped different, but the motor is the same so it really comes down to comfort.
I have an Oster clipper model # 274 series "A" from the 1970's
Some places that have the Oster Classic 76 hair clipper in stock would be most any beauty supply house like Sally's Beauty Supply. You can also purchase them on eBay or Amazon as well.
To replace the switch on an Oster Classic 76 clipper, first ensure the clipper is unplugged for safety. Remove the screws from the housing using a screwdriver to access the internal components. Disconnect the old switch from the wiring and replace it with the new switch, ensuring the connections are secure. Finally, reassemble the clipper by putting the housing back together and securing it with screws.
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here's a good site for cleaning and such (the a5 is the animal version of the 76): http://www.peasridge.co.uk/clipper-advice/clippers-products-oster-a5.shtml parts are available from: http://www.clipperparts.com/a-5_76.asp?pTitle=Oster%20A5%20And%2076%20Clipper%20Parts Be careful about switches and brushes, there are several models and they all use different switches and brushes . . .
To replace the blade on an Oster Model 274 series A clipper, first, ensure the clipper is unplugged for safety. Remove the blade by loosening the screws on the blade attachment using a screwdriver, then carefully lift it off. Align the new blade with the clipper's base and secure it in place by tightening the screws. Finally, double-check that the blade is securely attached before plugging in the clipper and using it.
The cord on the Oster Classic Heavy Duty Hair Trimmer is 8 feet long.
OA modified is built to cut thicker hair. other than that, both (literally) cut the same length.
The Oster Classic hair trimmer is very easy to clean. You simply pull of the head lock and then clean out the hair underneath.