I wasn't sure which catagory to ask this question to you technical gurus as it spans several possibilities.
I recently pulled out a tube amp that I hadn't used in a few years and upon hooking the system up discovered that a tube had gone microphonic. I located the offending tube and swapped it out and all seemed good to go. A couple of days later, I noticed the driver on my left speaker seemed to have too much excursion just as if there was some sort of subsonic noise like you can get from a warped record on a turntable that isn't filtered for subsonic signals.
Well, the issue resolved itself over a few hours, but that left me wondering a few things. First, knowing that some recordings are not polarity correct, is it possible for the cone to react to a phase shift causing the cone to drive in reverse while maintaining a phase correct voice coil so that the obvious center imaging remains?
Also, would I be correct to assume that tubes can become microphonic in the subsonic region just as they can above 20hz?
The reason these questions come to mind is that I swear the driver seemed to be working backwards while preserving phase correct imaging.
I wasn't sure which catagory to ask this question to you technical gurus as it spans several possibilities.
I recently pulled out a tube amp that I hadn't used in a few years and upon hooking the system up discovered that a tube had gone microphonic. I located the offending tube and swapped it out and all seemed good to go. A couple of days later, I noticed the driver on my left speaker seemed to have too much excursion just as if there was some sort of subsonic noise like you can get from a warped record on a turntable that isn't filtered for subsonic signals.
Well, the issue resolved itself over a few hours, but that left me wondering a few things. First, knowing that some recordings are not polarity correct, is it possible for the cone to react to a phase shift causing the cone to drive in reverse while maintaining a phase correct voice coil so that the obvious center imaging remains?
Also, would I be correct to assume that tubes can become microphonic in the subsonic region just as they can above 20hz?
The reason these questions come to mind is that I swear the driver seemed to be working backwards while preserving phase correct imaging.