Microphonic from Vacuum Tubes?


HI,  I have a question regarding microphonic from vacuum tube.  I have a Cary SLP-05, and I've changed the output gain tubes to some NOS RCA, and also recently purchased a pair of Linlai for the balanced buffer stage.

I now occasionally hear a loud pop in the music.   It doesn't happen very often, but when it does, it is quite loud.   This happens when I am streaming digital music, so it can't be those occasional pops you hear from vinyl.  

Can someone tell me if this loud pop possibly caused by microphonic in my tubes?  if so, how do I track down which tubes?   My guess there is no easy way but change one tube at a a time, which can be extremely time consuming.   Also I don't own a tube tester.  I wonder that would help tracking it down.

Also I read something about vacuum tube damper rings,  would that help calming down possible microphonic?

I still  consider myself a newbie in tubes,  so any hep will be appreciated.  Thanks very much.

128x128xcool

Thanks @acman3,  I wonder if it can indeed caused by a hiccup from streaming.  So far I've only experienced this issue while streaming from Tidal or my own MinimServer running on my NAS.   If I  know how to edit a digital file, maybe I can reproduce this issue.

My only other source is my vinyl setup, which I only use 10% of the time, and I haven't heard this popping noise while I was listening my vinyls.

I get that popping noise on qobuz when a track switches from CD to high resolution and back again.

@invalid, thanks for sharing that.  Does this happen consistently?   That must be so annoying.  I think that would bug me to no end.   😀

It does it consistently, I believe it's my bluesound node 2 when using the digital output. 

How many hours are on the Linlai tubes? If they are brand new they might need more time to settle in. My Psvane 845 and 300b tubes came with a card in the box saying they could need up to 150hrs until they are fully broken in. I did get some infrequent “odd” noises from the speakers for the first 50hrs or so after installing them but it’s been smooth sailing since then. The noises I was getting were the occasional crackle or ringing sound but never a loud pop that made me think my amp might be in danger.