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The Dual 1019 discussion below mentioned Dual's can have hard to eliminate hum.
Mine Dual 704 did. All the cleaning, tightening, changing cables, etc. had no effect. What finally did it was installing a new cartridge mounting plate. New pins, new wires from pin to cartridge. I suspect that the old cartridge pins were bound up and not making secure connection with the tonearm contacts. It could have been poor connections between wire and pins also.
Whatever it was, I can only say silence is golden.
Follow Ups:
The headshell design of the Duals is not the greatest. Each time I look at it, I'm amazed it works as well as it does. I really seem to have lucked out against "Dual Hum", though, by keeping all of the electrical contacts on the turntables clean.
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"We should look beyond the measurements." ~ From 'Engineering for Poetry Majors, 3rd Edition'
"Show me on the doll where the bad math touched you." ~ Vinyl Cop
Edits: 09/30/15
The headshell design is my biggest complaint with Dual turntables. Otherwise there's much to recommend them: build quality and 78 RPM capability being two big factors.
I am on my fourth Dual which is a 1219. Out of all four, I never once experienced any hum. I have bought all four from Fix My Dual, This is the only brand he works on, and he's been working on Duals for a very long time. He does an excellent job rebuilding them and making sure the turntable works 100% before shipping the table to the new owner.
It is the big secret that no one seems to get. Wires in Dual headshells are crimped to their respective connectors. The connectors are all silver-plated, and silver oxide sucks as a conductor. Squeeze each crimp, and this might resolve a problem. Soldering is an even better solution.
Reminder- I know this stuff, as I am the only reliable Dual repair person in the Eastern USA.
Yeah, except that the infamous "Dual hum" tends to be channel-specific -- in the left channel, I believe, though often faint. My Dad's had it on his 701 for 40+ years, and he's very competent electrically. He's never been able to track down the cause of the problem.
If it were just an issue with the headshell connectors, you'd expect a more-or-less equal frequency of noise problems in both channels. But in this particular case...
Soldering connections may seem like a great idea, until you snap a lug. If you're lucky, won't have to replace the whole mounting sled, since you no longer have the option of simply pulling off the broken wire.
"...only reliable Dual repair person..." I'm trying to think of how many problems I've caught that so-called Dual experts missed. Good thing I don't charge me anything for my time.
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"We should look beyond the measurements." ~ From 'Engineering for Poetry Majors, 3rd Edition'
"Show me on the doll where the bad math touched you." ~ Vinyl Cop
nt
THANK YOU my fellow audiophool.
So?
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"We should look beyond the measurements." ~ From 'Engineering for Poetry Majors, 3rd Edition'
"Show me on the doll where the bad math touched you." ~ Vinyl Cop
And I cannot tell you how many of 'some other guys'' repair jobs I have had to re-repair.
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