Does anybody use a vintage Pyrex percolator on their stove? Electric? Gas? Is it 100% safe? I just saw it in an old movie, which is what gave me the idea to look for one.
Pyrex percolators made after 1940 were not intended to be used directly on a heating element as stoves made after 1940 had a higher burner heat level that those made in previous years. (Presumably, those made before 1940 were placed directly on a burner.)
The Pyrex percolators I remember had a wire 'grid' or 'heat spreader' that was to be placed on the burner and then the percolator sat directly on that. If memory serves me correctly, they came in a variety of shapes. See below for an example.
I think I have the definitive answer to this question. I found the Pyrex percolator at the Corning Glass Museum. It came with a metal heat diffuser. If you scroll through all the pictures (links to the other images are to the lower right of the main image), you’ll even see the paper sleeve the diffuser came in.
If you search the museum collection for glass percolator, a number of them come up and most have a metal heat diffuser in the full set.
We’ve been using our vintage coffee pot on an electric stove without a diffuser for a week. It hasn’t damaged it but we’re now using the diffuser that came with our Chemex coffee maker.