HV transformers: Difference between revisions
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In many classic scopes, the high voltage transformer that supplies the cathode, blanking, and anode voltages has a tendency to break down. | In many classic scopes, the high voltage transformer that supplies the cathode, blanking, and anode voltages has a tendency to break down. | ||
This is mostly because of aging of the potting material used for the high-voltage windings. | This is mostly because of aging of the potting material used for the high-voltage windings. It will running very hot, because dielectric loss is too high. It is a thermal runaway. | ||
Currently, the only options when this happens are to find a similar transformer from another scope, | Currently, the only options when this happens are to find a similar transformer from another scope, | ||
or to get a rewound transformer. | or to get a rewound transformer. | ||
The same HV transformer, part number 120-0308, is used in the [[543|543B]], [[544]], [[545|545B]], [[546]], and [[ | Inofficial second options is good cooling of high voltage transformer (It is testing by 556´s HV-transformer) | ||
The same HV transformer, part number 120-0308, is used in the [[543|543B]], [[544]], [[545|545B]], [[546]], [[547]] and [[556]]. | |||
Chuck Harris, who frequents the Yahoo Tekscopes forum, has rebuilt several 120-0308 transformers with good results. | Chuck Harris, who frequents the Yahoo Tekscopes forum, has rebuilt several 120-0308 transformers with good results. | ||
[[Category:Repair issues]] | [[Category:Repair issues]] |
Revision as of 12:35, 6 December 2014
In many classic scopes, the high voltage transformer that supplies the cathode, blanking, and anode voltages has a tendency to break down. This is mostly because of aging of the potting material used for the high-voltage windings. It will running very hot, because dielectric loss is too high. It is a thermal runaway.
Currently, the only options when this happens are to find a similar transformer from another scope, or to get a rewound transformer.
Inofficial second options is good cooling of high voltage transformer (It is testing by 556´s HV-transformer)
The same HV transformer, part number 120-0308, is used in the 543B, 544, 545B, 546, 547 and 556. Chuck Harris, who frequents the Yahoo Tekscopes forum, has rebuilt several 120-0308 transformers with good results.