Kondo Overture PM2i - buzzing noise from transformer

You need a better AC power conditioner. It's possible that it's the transformer, but I would put my money on DC on your AC power line. There are good DC blockers and not so good, best wishes.

Call Audio Note.

In my 1990 OnGaku, which I play a lot, last year slight hum started and I ended having to replace the transformer , I am glad I had a couple original.

You are lucky you can, and should, call Audio Note.

Thanks astolfor, I had an intensive and very helpful communication with Kondo Team in the meantime and we did several measurements with a certain app to measure noise in dB. Laying the iPhone on the buzzing transformer on my and their Overture made things clear. My Overture produced even 6.6 dB less noise (32,6 dB) than their 39.2 dB. So I guess my ears are just too sensitive.

Transformers should not be audibly buzzing. It is not normal. If that were true, all of your transformers would be buzzing.

Hi chayro, well Kondo sent me a photo with the iphone and "NIOSH SLM" app positioned on top of the transformer of their reference Overture amp showing 39.2 dB. I used the same app with same app settings and mine was even quieter at 32.6 dB. Now what does that mean..?