Pearl hum, I bought already built. Any advise where to try to reduce hum. First I thought it was Grado ref sonota 1, there known to hum so tried MI Soundsmith did same thing. Strange thing it changes when you bring tonearm towards spindle at beginning of record it's louder in right speaker. Go towards spindle hum fades louder to left speaker. Sounds like a non shielded cartridge having problems with motor but both cartridges do it. They have never done that on other preamps. It increases with volume. It's not bad at low volumes. Looks like ground mounted on Back for turntable ground is maybe not grounded in the best place will try that first. Are there some common places to look for hum, thanks for any direction.
Hi there
Sometimes I repair Turntables. If the cartridge is removed does it hum also?
My idea about this that the inside cable in the Tonearm may is defective on the shield wires, or is broken.. Use a Ohm Meter and measure at both end if you have throughput.. Ohm meter should read 0 Ohm.. If possible use a analog meter is better to measure things like that than a digital.
Second measure if the ground-wire touches the Arm and shorten the Arm instead of the Grounding point or the turning point of the arm.
Wires in the arm are very thin, there will always be a chance that one of these wire somewhere have a part where it grounds the wire.. because ground wire is just the second end of the coil. When Cartridge is mounted check the resistance at the end of the wires. Both sides must read the same amount.
Usually
Red: Signal right
White: Signal left
Green: Ground right
Blue: Ground left
Use the documentation of your cartridges to fine out which colors are the pairs left right.
Last but not least check if the Wires are really so connected as it should be. Ground and Signal end..
Hope this helps.. its hard for me to explain. English is not my native language.. and its 4:39 am..
Regards Chris
Sometimes I repair Turntables. If the cartridge is removed does it hum also?
My idea about this that the inside cable in the Tonearm may is defective on the shield wires, or is broken.. Use a Ohm Meter and measure at both end if you have throughput.. Ohm meter should read 0 Ohm.. If possible use a analog meter is better to measure things like that than a digital.
Second measure if the ground-wire touches the Arm and shorten the Arm instead of the Grounding point or the turning point of the arm.
Wires in the arm are very thin, there will always be a chance that one of these wire somewhere have a part where it grounds the wire.. because ground wire is just the second end of the coil. When Cartridge is mounted check the resistance at the end of the wires. Both sides must read the same amount.
Usually
Red: Signal right
White: Signal left
Green: Ground right
Blue: Ground left
Use the documentation of your cartridges to fine out which colors are the pairs left right.
Last but not least check if the Wires are really so connected as it should be. Ground and Signal end..
Hope this helps.. its hard for me to explain. English is not my native language.. and its 4:39 am..
Regards Chris