just saw there are any old ant miners, like s5,s6, s9 etc. being sold for $100- $600.
I know they are useless to mine BTC today, but my question is if is it possible to use them to mine any other altcoins?
No , Asic's in question are programmed to mine with SHA256 Algorithm (Mainly BTC). So u can use it to mine any other coin with uses the same algorithm as mining BTC is not profitable .
Ok, would you mind to mention some examples of altcoins to mine with it?
Or a source where I can take a look?
the s9 is okay for bch or bsv
but the l3+ does ltc and doge merged mined at viabtc.com
it is fairly quiet and has a lot of control to let set your hash rate and sound levels.
i have
15 l3+ sitting in boxes
8 s9s sitting in boxes.