PCA
Active Member
I sawed open a couple of the casings and tested out the tubes. One of them is still slightly microphonic - just for a few seconds after you turn the preamp on. I am assuming just one, since the hum is coming from only one speaker. No issues while continuously playing music. The Chinese tubes that came with the E6 were unlistenable.Attaching a photograph of the tubes and data sheet
Maybe I will saw open the rest of them, in hope of finding two non-microphonic tubes
