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Tubes Became Microphonic

About 6 weeks ago I put in some NOS Sylvania 6SN7's into my Rogue Magnum 99 preamp. Just today they became microphonic. Just touching the volume knob caused a metallic sound through the speakers. Tapping anywhere on the chassis did the same. Is this common? Anyone else with similar experience? Is it just a tube issue or something else? I do plan on speaking with Rogue asap but wanted advice/experiences here. thx
ehaller

Showing 1 response by fatparrot

fatparrot
1,314 posts
 
Also remember that NOS tubes will last considerably longer than the current crop of Chinese and Russian tubes. And they WILL sound much better!

And PLEASE don't use that tired old cliche that manufacturers "voice" their products for current production tubes!
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