If you're used to using the corded clippers and like the result, consider replacing the old Oster with a new A5 Turbo or Golden or, pretty similar I think, the Andis AGC2.
The Oster Turbo A5 is a 2 speed and the Golden is available as a 1 speed and a 2 speed. The Andis is a bit less expensive than either Oster on Amazon but it's not a huge difference in price. Jojogal001 bought a used Oster on ebay for way less, if you're comfortable trying that route.
I can't help with the loudness since I don't use either of those. If the blade is what's getting hot, it's usually suggested to get a second blade to swap out during the session. If you still have the non-working clipper, the blade from that one can be your second blade. Is it a #30 or a #10 or ??
"Generally, for pet dog clipping, you are better off by using middle of the range that gives a medium cut. It is not necessary to have more than a couple of blades, unless you decide that you either want to clip your dog to show standards which requires different lengths of coat, e.g. a poodle or schnauzer, or perhaps you may prefer to have a shorter blade which will keep your dog short during the hot summer months and a longer blade for a longer clip during the cold winter months. You might decide to have a Blade # 10 for clipping around the anal area to keep it clear and clean and also underneath the hind leg area which sometimes can get knotted.
Below is a list of the different clipper blade numbers and lengths of cuts. Each brand of clipper blade may vary slightly in length but they all are pretty much the same.
Dog Clipper Blade Numbers and Lengths of Cut
Below is a list of the clipper blade numbers and the length of coat that is left on the dog after the clip.
Clipper Blade Number | Description of Cut |
Blade #3 or #3F | Cuts and leaves 1/2" or 13mm length of coat on the dog |
Blade #4 or # 4F | Cuts and leaves approximately 3/8" or 9.5mm length of coat |
Blade #5 or #5F | Cuts and leaves approximately 1/4" or 6mm length of coat |
Blade #5/8 Toe Blade | Is specifically for clipping between the toes and feet |
Blade #7 or #7F | Cuts and leaves approximately 1/8" or 3.2mm length of coat |
Blade #7/8 Toe Blade | Is specifically for clipping between toes and feet |
Blade #8 1/2 | Cuts and leaves 7/64" or 2.8mm length of coat |
Blade #9 | Cuts and leaves approximately 5/64" or 2mm length of coat |
Blade #10 | Cuts and leaves 1/16" or 2mm length of coat |
Blade #15 | Cuts and leaves 1.2mm length of coat |
Blade #30 | Cuts and leaves 0.5mm length of coat |
Blade #40 & #50 | Are specifically for short surgical cuts |
Different brands may have slightly different blade numbers however generally the lengths will be pretty much standard as the guide above.
Recommended blade numbers for different lengths of cut for pet clipping:
Summer: Blade number to use over the body – # 7; blade number for clipping around the anal area and underneath the dog’s hind leg area – #10.
Winter: Blade number to use over the body – # 4 or #5; blade number for clipping around the anal area and underneath the dog’s hind leg area – # 10.
If you use any shorter or longer over the dog’s body you may find the cut is too close to the skin and doesn’t look that nice or it is too long and it means you have to clip the dog more often to keep it tidy.
If you are doing specific breed clipping then you will need to follow the recommendations for that particular breed and it may be necessary to purchase more dog grooming equipment."
The combs/guards come in a lot of sizes. I use a cordless 5 in 1 clipper so I can adjust the one clipper to 5 different lengths by moving a small lever to switch from #40, #30, #15, #10, and #9 without changing out the blade.
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I bought the full set of steel combs since I really wasn't sure which ones I'd be using. It wasn't terribly expensive but would be cheaper to pick up 2 or 3 in different enough lengths to cover longer to shorter. It turns out I stick with the shorter 4, the 1/8" to 1/2". If you use a #30 blade, the cut with the comb will be just about exactly the measurement listed for the comb. If you have a #10 blade, add that length to the comb length for a slightly longer cut length.
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I don't remember positively but I think the Wahl combs above interchange with both the Andis and the Oster's above. Definitely double check for compatibility before you buy any. I know they fit my cordless Wahl but can't say for sure on the others I mentioned.
I don't go shorter than a #10 blade for face, feet and sanitary. In fact I usually go to the #9 setting but that's because I'm still learning.
I get enough dirty looks from the boys doing the groomy groomy. I want to avoid bloodshed

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Here's the Oster chart with blade recommendations for various cuts
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