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Re: Transforming buzzing:is it gonna blow!?

152.163.213.59

Posted by Joe Rosen on February 20, 2000 at 00:44:18

In Reply to: Transforming buzzing:is it gonna blow!? posted by Scott Woebcke on February 19, 2000 at 20:02:31:

Dear Scott,
just thought I would also mention that if Dave's suggestion doesn't work, it COULD be a defective transformer. Given that Jolida is about the lowest priced valve gear you can find, and that I'm quite sure that it is built in China (If not the whole thing then certainly the transformers), you shouldn't expect perfection. The buzzing is NOT a sign that the transformer is about to fail! Two other reasons account for transformer buzz:
1) The transformer windings were not wound snugly enough around the core and have worked loose.
2) The transformer is made with insufficient or substandard iron, and the core runs close enough to saturation due to insufficient magnetic headroom to make a slight buzz. This is more common than one might think. Quicksilvers, anyone?
A third possibility is magnetostriction, but this is experienced when a steel cover on an amp is too close to the top of the transformer. I don't have much experience with Jolida, but I think I can assume that you are not running it with a cover, assuming that one is even available.
Can't see how the 2 smaller transformers would buzz at all, it may just seem that way. Your ears can have a hard time pinpointing location of sound below 200c/s. Good luck, doesn't sound serious.

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