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Tube Amp "Ringing"

I have a Jolida SJ-502A tube intergrated amp and tonight I noticed a "ringing" sound coming from the amp. Didn't notice it when the music is playing, but when I changed my CDs and was close to the amp, noticed the ringing. Was curious on what it could be and how I can solve this problem. btw, I'm a "tube newbie", and help and suggestions would be appreciated. Thanks.
cleaneduphippy
cleaneduphippy OP
323 posts
 
My amp the 502 uses the 6550 (currently using Svetland) or can use KT88. The 302 on the other hand is the Jolida that uses the EL34. Currently, in the 12AT7 positions I'm using NOS RCA Black Plates and in the 12AX7 positions I'm using Sovtex. Maybe this afternoon, I'll try to pin point which tube(s) is the "ringer". btw, any good suggestion on some good "low noise" tubes? Brashgordon, thanks for the Telefunken suggestion. Was going to get a pair, but the dealer I usually buy from was out of them at the time.
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cleaneduphippy OP
323 posts
 
Tvad,

You answer my question, on just how to figure "which" tube is the "ringer", now to find a pencil with an eraser. The NOS RCAs are my "newer" tubes, but nevertheless we'll see what happens. One more thing, do you have a link for TVS? Might try giving Andy a call and see what he's got.

btw, to Everybody

Do appreciate all the info you're giving me. As I said I'm a "newbie" and still learning.
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