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Vintage threads from the first ten years
| previous: SteveB I picked up a 66 Bassman yesterday ... -- 1133711500 |  |
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Re: Hot PT in BF Bassman....
 12/5/2005 6:25 AM |
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| R.G. | Re: Hot PT in BF Bassman.... Transformers run near their rating run hot. In fact the power rating of a transformer is *determined* by how hot it gets. A transformer with Class A temperature rise insulation system (A is the lowest temp rise capable rating)will get to about 130F at full power. 130F is just hot enough that you will not keep your fingertips on the surface - Bruce, you were touching transformers running just about where they were designed. The same iron and copper with Class H insulation could run happily at the boiling point of water and put much more power - and do it on a continual basis. It's the insulation temperature rating that's the weak link, so insulation temperature rating defines th power rating. And transfomers are dense. The thermal time constant of a ten-pound transformer is about an hour, so it takes a while to get them hot and also a long time to cool down. I agree with Bruce - the observed action is normal unless you find some other problem. |
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| Bruce /Mission Amps Thanks for the confirmation... |