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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Foregoing warranty rights
On Sunday, April 3, 2011 4:15:48 PM UTC-7, David Nebenzahl wrote:
On 4/3/2011 5:29 AM Geoffrey S. Mendelson spake thus: So--and this is completely out of left field, I know--what would happen if a guy put a vacuum tube--say a biggish octal one, like a 5Y3 or a 6V6--into a microwave and nuked it? You mean, 'nuked it AGAIN', don't you? The usual manufacturing of vacuum tubes is finished off with pumpdown, sealing, and then running an induction coil to heat the little loop-thing that evaporates a bit of metal (like sodium). It's called 'flashing', and the silvery deposit ('getter') on the inside of the tube is intended to be an oxygen scavenger for the long lifetime of the device. In the case of photomultipliers, it is also done to create the photocathode layer, often of some alloy that cannot be usefully blended until there's a vacuum. |
#2
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Foregoing warranty rights
On Mon, 04 Apr 2011 13:36:49 -0700, whit3rd wrote:
On Sunday, April 3, 2011 4:15:48 PM UTC-7, David Nebenzahl wrote: On 4/3/2011 5:29 AM Geoffrey S. Mendelson spake thus: So--and this is completely out of left field, I know--what would happen if a guy put a vacuum tube--say a biggish octal one, like a 5Y3 or a 6V6--into a microwave and nuked it? You mean, 'nuked it AGAIN', don't you? The usual manufacturing of vacuum tubes is finished off with pumpdown, sealing, and then running an induction coil to heat the little loop-thing that evaporates a bit of metal (like sodium). It's called 'flashing', and the silvery deposit ('getter') on the inside of the tube is intended to be an oxygen scavenger for the long lifetime of the device. In the case of photomultipliers, it is also done to create the photocathode layer, often of some alloy that cannot be usefully blended until there's a vacuum. They use getters in metallurgy to absorb impurities. The getter is actually the "little loop-thing" and not the deposit that is a byproduct of the flashing. Some getters are made of a special material and don't need flashing. Don't ask me for a tube number. Tubes with graphite plates don't need a getter as the graphite absorbs impurities. -- Live Fast Die Young, Leave A Pretty Corpse |
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