It's been over five years since I built this loctal preamp. I moved it recently so that it'd be between my two turntables. In this location, I was surprised by higher-than-usual hum and noise levels emanating from the phono section especially when compared to my RCA octal + 76 line stage.
Given that it had been playing quietly and flawlessly until it was relocated, I was dumbfounded. Then I noticed that when I put my hand close to either 7F7 tube, the hum and noise got even louder.🤔
Before taking the preamp out of the system for a thorough check up on the test bench, I searched for a couple of tube shields from my parts bin.
Voila! The unusual hum and noise vanished.👍
Sit back and enjoy Alice Coltrane's "Blue Nile" from her album "Ptah, The El Daoud"! 𝄞 𝄢🎶
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