Ancient - But Still Works!
I have a model so old that they do not make it anymore, and I have no idea of the model. I think it was a early version of the Snackmaster but I cannot be sure, (it's round, if that helps... fan on the bottom).
It's old, cranky, and no longer stacks neatly because at some point it overheated and the trays warped just slightly... while I wouldn't use it for meat, anymore... it works just fine for vegetables.
The thing is -- the ancient old dehydrators are *fine* for vegetables and other less tricky items so as long as you are not making jerky? Keep it until it dies!