![]() ![]() There is a slight hum, My Shindo is silent until the 10 or 11 o'clock position, but both of them have the same hum with no music playing when turned up halfway. I have been listening all morning with no problems. ![]() Powered everything back up and very little hum and NO movement in the drivers! It sounds very good. I think at the same time i switched the input impedance on my first watt SIT2 to 10k instead of 100K, remembering yesterday that the movement seemed less in the driver as i went down in value. I have a 12au7 in my bottlehead crack so i tried it in my pre. It was hard to tell but something seemed off with the filament or leads inside the tube. This morning I inspected the right channel ecc82 tube on the pins where the resistor leads had touched. still hum, and osculating speaker driver problem. Replaced the fuse, and the ecc82s back in original left and right positions. And powered on and i think blew the fuse. I easily separated them and suspected maybe that had something to do with the hum problem which was worse in the right speaker. I also noticed that a couple of leads of the resistors on the were touching on one of the ecc82 input tubes. I removed 2 bypass caps as directed by the manufacture of the preamp. When a capacitor is used in power supply circuits, its major function is to carry out the role of bypass, decoupling, filtering and energy storage. ![]()
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