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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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#1
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Temperature indication by effect on plastic part labels?
Valve amp with the three main lumps made by the same manufacturer and the
same sort of 0.05 mm soft white plastic part labels on the outside , so PVC or polythene perhaps. Output Tx label as original , choke just starting to show signs of ruckling/cockling, and the mains transformer noticably ruckled , still same white and footprint is the same ie the edges are in the original position. So mains Tx has got the hottest presumably, any guesses as to what sort of temperatures, and what if the label was seriously ruckled with distorted or unreadable script or discoloured and shrunken footprint ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#2
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Temperature indication by effect on plastic part labels?
"N_Cook" wrote in message ... Valve amp with the three main lumps made by the same manufacturer and the same sort of 0.05 mm soft white plastic part labels on the outside , so PVC or polythene perhaps. Output Tx label as original , choke just starting to show signs of ruckling/cockling, and the mains transformer noticably ruckled , still same white and footprint is the same ie the edges are in the original position. So mains Tx has got the hottest presumably, any guesses as to what sort of temperatures, and what if the label was seriously ruckled with distorted or unreadable script or discoloured and shrunken footprint ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ In my experience, the temperature has only reached something to worry about, when the wound components are actually smoking in use ... !! Over a period of around 40 years that I've been repairing valve amplifiers, I have seen many many examples of mains and output transformers, and HT filter chokes, which have run so hot in normal use, that there is a large pool of melted and resolidified wax around their bases. Arfa |
#3
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Temperature indication by effect on plastic part labels?
Arfa Daily wrote:
"N_Cook" wrote in message ... Valve amp with the three main lumps made by the same manufacturer and the same sort of 0.05 mm soft white plastic part labels on the outside , so PVC or polythene perhaps. Output Tx label as original , choke just starting to show signs of ruckling/cockling, and the mains transformer noticably ruckled , still same white and footprint is the same ie the edges are in the original position. So mains Tx has got the hottest presumably, any guesses as to what sort of temperatures, and what if the label was seriously ruckled with distorted or unreadable script or discoloured and shrunken footprint ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ In my experience, the temperature has only reached something to worry about, when the wound components are actually smoking in use ... !! Over a period of around 40 years that I've been repairing valve amplifiers, I have seen many many examples of mains and output transformers, and HT filter chokes, which have run so hot in normal use, that there is a large pool of melted and resolidified wax around their bases. That's solidified magic smoke? |
#4
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Temperature indication by effect on plastic part labels?
From trying to find thermochromic materials, this is some data I got along
the way, from trying Mylar film (or metalised plastic anyway) ; bubbles/wrinkles 75 deg C, shrinks 80 degree C and shrunk to 1/4 95 deg C so pvc and polythene probably similar -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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