No phenomenon here.
There maybe bad solder joints or poor contact at tube sockets that needs to be cleaned once-a-while.
There maybe bad solder joints or poor contact at tube sockets that needs to be cleaned once-a-while.
Tube microphonics in a preamp
Hello
I just installed some Amperex 7308 white labels into my Blue Circle BC 21.1 preamp. They sounded wonderful right off the bat but exibited some microphonic (tinging and ringing) through the speakers when I changed the volume or even touched the surface of the unit. THis was not apparent on listening to music. Now that they have had about 30 hrs on them, the microphonics are gone. Normal phenomenon? Have the tubes gone bad now or have they broken in. I don't notice a big degradation in sound quality...I've probably gotten used to them. Would YOU keep using them? Thanks. Dave.
I just installed some Amperex 7308 white labels into my Blue Circle BC 21.1 preamp. They sounded wonderful right off the bat but exibited some microphonic (tinging and ringing) through the speakers when I changed the volume or even touched the surface of the unit. THis was not apparent on listening to music. Now that they have had about 30 hrs on them, the microphonics are gone. Normal phenomenon? Have the tubes gone bad now or have they broken in. I don't notice a big degradation in sound quality...I've probably gotten used to them. Would YOU keep using them? Thanks. Dave.