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Tube Whine noise...Please Help

Hi everyone.

As a newbe to tubes I am having a problem that I need some help on. I just received my Musical Design SP-2 preamp and while it sounds wonderful, occationally there is a high frequency whine/whistling noise coming from one or both speakers. The SP-2 uses 2 6922 that the previous owners said were NOS RCA types. I want to know if the tubes went bad and needs replacing or if there is another problem that I need to look for. Thanks
speedracerucr
speedracerucr OP
16 posts
 
It seems to me that the surest thing I can do to eliminate the ringing/whining is to replace my tubes. Since this is the case, are there any low noise/low microphonic 6922/6DJ8 that you can recommend to me? As of now, I am probably not looking to tube roll with NOS. Thanks
brucegel
151 posts
 
Tesla and sovtek from the tube store or any reputable seller will do.
speedracerucr OP
16 posts
 
Thanks everyone for your help. An update on my original problem: I replaced my tubes with 2 NOS JAN Phillips 6922s and the ringing is gone. Now that I know the problem was caused by bad tubes, I will start tube rolling with better NOS soon.
phd
1,283 posts
 
I would like to add to this forum by saying the SP-2B is a zero negative feedback design & as a result it will require specific tubes that are suitable for this design. Best to purchase a matched pair from Musical Design/ John Hillig who has done extensive research & testing on the right tubes for the SP-2B, that will work properly without exhibiting microphonics and the above mentioned problem. This is the best way to go.
orind
27 posts
 
I had the same issue (same tubes)-John suggested reseating the tubes--it worked.
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