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Audio and Video Talk
Vinyl
Pioneer PL-12 Turntable DIY Mod
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<blockquote data-quote="fdlsys" data-source="post: 202169" data-attributes="member: 2310"><p>Jaco, the "ground" and shields are all connected together, it's all fine.</p><p></p><p>sh4rpz, as I thought - the "hum" is not electrical but mechanical. There could be a 1001 reason for that, and you should start from the obvious; sponge spring dampers first. </p><p>Did you clean the main bushing before topping up with oil? The subtle "grind" of the bearing could often be mistaken for hum. </p><p>Is the arm (pivot) movement (horizontal and vertical) completely effortless, no resistance? The arm wiring could get caught up so to say between the exit from the arm and where it enters the arm pivot spindle (tube) which will make the wires rub against both the arm and the spindle, which *may* be audible... </p><p>...as I said, 1001 possibility; you'll have to tackle it one at the time.</p></blockquote><p></p>
[QUOTE="fdlsys, post: 202169, member: 2310"] Jaco, the "ground" and shields are all connected together, it's all fine. sh4rpz, as I thought - the "hum" is not electrical but mechanical. There could be a 1001 reason for that, and you should start from the obvious; sponge spring dampers first. Did you clean the main bushing before topping up with oil? The subtle "grind" of the bearing could often be mistaken for hum. Is the arm (pivot) movement (horizontal and vertical) completely effortless, no resistance? The arm wiring could get caught up so to say between the exit from the arm and where it enters the arm pivot spindle (tube) which will make the wires rub against both the arm and the spindle, which *may* be audible... ...as I said, 1001 possibility; you'll have to tackle it one at the time. [/QUOTE]
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Audio and Video Talk
Vinyl
Pioneer PL-12 Turntable DIY Mod
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