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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

Showing 2 responses by slipknot1

slipknot1
1,423 posts
 
Jig is correct. Some 6922/6DJ8 tubes are more prone to microphonics than others. If you have some spares to swap, try that. Sometimes the use of tube dampers can help with that. Herbies Audio Labs HAL-O tube dampers are very good at cutting down microphonics.

The high pitched "ringing" you hear from these tubes might be from microphonics being caused by vibrations in the tube.
slipknot1
1,423 posts
 
I have had good success with HAL-O's. I also have had good luck when buying new tubes getting the low noise "LN" variety. It may not eliminate it, but it could greatly reduce it. In my previous post, I left out the "in" in front of correct.

Thermionics are what makes the glass bottle work, to make the music go round-n-round
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