Eden wt-400s hum/buzz

[Funkerator]

I have never posted on a forum before, but seek advice on my Eden WT-400 bass head.

I recently bought a WT-400s, a reissue of the original from original parts 2006. It is a nice amp but when I turn it on it makes a buzzing sound that does not seem to come through the speakers, just from the amp.

I thought is was kind of loud so I bought another WT-400, an original issue from 2000 to compare noises.

The WT-400 also makes this buzzing sound that does not come through the speaker but at a much quieter level. The comparison was done with identical connections.

Can anyone identify the cause of this noise and is there a way to minimize or eliminate it?

[Garydean]

Toroid transformers can be noisy. I heard there was an "upgrade" to help that problem and it's mentioned on the Eden site. I just went to the "upgrade" page and it was down

[Funkerator]

Ok, someone told me that it could be the transformer. Thank you for this information. I will try to find the "upgrade" info on the eden site.

Do you know if power conditioning and possibly power isolation transformers could reduce this kind of transformer noise?

THANKS!

[Enzo]

Not likely. If it is a mechanical sound from the 60Hz current flowing through the torus, any loosenesses in it can result in noise/vibration.

[Garydean]

Bingo. Thank you!!