It sounds as if my transformer buzz (mechanical) may not be DC on the line. As I mentioned in the other post, most transformers make a bit of noise for me. The quietest one is an old Sherwood. I pulled the endbells off it once, and they were filled with some sort of white compound. (It was a pain to put the broken pieces back in!) In contrast, the transformer that is now giving me problems has thin endbells that actually ring like bells!
I've seen several posts about potting transformers, but wouldn't filling the endbells with something be a more gentle approach? It would inhibit cooling, but surely not to the extent that potting a transformer would, as the edges of the lams could still breath. So, what if one jammed the endbells full of something like duct seal? It is non-conductive and pretty tolerant of heat, right? If the transformer ran too hot, it would also be easy to remove.
thoughts?
pj
I've seen several posts about potting transformers, but wouldn't filling the endbells with something be a more gentle approach? It would inhibit cooling, but surely not to the extent that potting a transformer would, as the edges of the lams could still breath. So, what if one jammed the endbells full of something like duct seal? It is non-conductive and pretty tolerant of heat, right? If the transformer ran too hot, it would also be easy to remove.
thoughts?
pj
Every tube amp transformer that has been in this house has buzzed, except for one. And it was potted. Hopefully they weren't all faulty! This one just buzzes a bit louder than others. I don't know that I can "thoroughly test" it's electrical performance. It seems to behave fine. The longest I let it run under load was half an hour or so, and it didn't get very warm. I figure if it were saturating or had real troubles, it'd run hot, right?
I'll play with it some more today. I won't make any drastic moves. Epoxy putty also comes to mind.
pj
I'll play with it some more today. I won't make any drastic moves. Epoxy putty also comes to mind.
pj
Interesting thought! I love that stuff. I suppose the ultimate would be gorilla glue or polyurethane construction adhesive, as both expand (the former more than the latter). That certainly is a point of no return.
pj
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pj
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You mean this thread? http://www.diyaudio.com/forums/showthread.php?s=&threadid=139070&highlight=pjanda1 said:
My Hammond PT still buzzes but the ringing is gone after lining the inside of bell with fiberglass resin.
It's probably only a good idea too fill the endbells if you can use the same type of compound they use to pot transformers.
The material should have a high dielectric strength and be a good thermal conductor. Maybe if your transformer runs cool, you can get away with using something else. Unfortunately, a buzzing transformer is usually a hot transformer.
Lining the endbells probably wouldn't be a problem, but may not help that much.
The material should have a high dielectric strength and be a good thermal conductor. Maybe if your transformer runs cool, you can get away with using something else. Unfortunately, a buzzing transformer is usually a hot transformer.
Lining the endbells probably wouldn't be a problem, but may not help that much.
Do you have some silmilar problem with other trafos connected to the same mains?
If your mains has some DC component it might be saturating the core and make the trafo ring.
Or you might be using a 220V trafo with 240V
Or you might just have some nasty harmonics on the mais.
Or finaly you might just have a badly designed or built transformer.
If your mains has some DC component it might be saturating the core and make the trafo ring.
Or you might be using a 220V trafo with 240V
Or you might just have some nasty harmonics on the mais.
Or finaly you might just have a badly designed or built transformer.
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