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BeePre / Re: Mechanical Buzz from Power Transformer on BeePre2
« Last post by BrucePoi on April 14, 2024, 07:31:41 AM »On some different transformers I've been using from a different vendor, I've been struggling a bit with the transformer cover rattling against the bits of the transformer under it. For your Kaiju, it might just be that the varnish underneath is in just the right spot that the top cover can rattle against it, or it could be that bits of the bobbin are sticking up just enough to contact the top cover.
One experiment you could try is just running the amp without the top transformer cover (definitely put the screws back though) just to see if that offers any kind of relief. If so, maybe post a picture of what the top of your PT looks like and maybe it's just a matter of cutting some of the plastic away or adding some goop under the cover to keep it stationary.
Paul,
The transformer cover wasn't contacting the transformer itself on my BeePre2 because I had already tried inserting nitrile o-rings as some sort of soft mount between the two on the screws.
I took the end cap off and remounted the transformer, but I'm still getting a buzz directly out of the transformer. The short video below has a clip of me switching the preamp on without tubes--and it's dead silent. The next clip in the same video shows me turning it on, with tubes in, and you can hear the buzz. I'm also showing you my line voltage. I used the 115-130V option when wiring.
How do I quantify how loud it is, given it's a cell phone video. Well, my Kaiju's power transformer really is dead silent, even with tubes in and my ear right up to it. It's louder than the buzz from 1971 Fender Twin Reverb in standby. At my listening position 9' away, you can hear it--especially if you know what to listen for. As I said in my first post, once you hear it you can't un-hear it.
Let me know if you have some other things I could try.
Thanks,
Bruce
https://youtube.com/shorts/m824NZHDAic?si=BqbWcAeil9nehqa-
