Safety

[Rob]

John,

Excellent post! To further highlight the implosion concerns of large picture tubes I should mention that your pressure estimate was considerably on the low side. At sea level atmospheric pressure is 14.7 pounds per square inch of surface area. The pressure on just the faceplate of a 21" round faceplate TV picture tube is 14.7 X 346 square inches = 5,091 lbs. Yes Folks, that is 2.5 tons!!!!

Vintage color TV restorers should take special note. This is why any attempt to remove cataracts from an otherwise electrically good 21FJP22 color CRT by physical removal of the laminated faceplate is such a potentially hazardous and delicate operation, to be attempted with the greatest care, a containment vessel around the tube for possible flying glass and with safety clothing and face/eye protection.

Rob