This is part of the audio board of my teac a-l700p amp. I know what resistors and caps look like, but I have no idea what the long slinder gray component is. Is it a resistor in disguise or something else? The board labels it as BD86 or BD85. Thanks for your time in this matter, Kevin.
No components are inherently good or bad for the sound; it depends how they are used. They will look pretty much like a plain piece of wire at audio frequencies, so they shouldn't do any harm, but applied appropriately they will keep high frequency nasties out (or stop them escaping, if they are internally generated), which is of particular importance for switching amps.
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