I have a 5 amp model, it's plenty for any vintage TV set but light duty enough to pop it's breaker if there's a short.
This model here exactly though I paid a lot less.
http://www.ebay.com/itm/General-Radi...item259b913249
It does not isolate but I have a separate transformer for that. I do wish it had an ammeter built in but I added an external one.