Aquarium stands are designed to support hundreds of pounds of weight, and they’re large enough for most CRTs to fit comfortably.

I use the metal “imaginarium” brand from Petco, and they’ve worked phenomenally for my Sony Wega 32FS320: https://www.petco.com/shop/en/petcostore/product/imagitarium-brooklyn-metal-tank-stand-40-gallons

Just be sure to measure your CRT’s dimensions before buying so that the one you get will fit.