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hi everybody,i've got a TD-145 and i'm very happy with it in general, especially since i replaced the built in RCA cable with some gold plated jacks!
unfortunately there's some 60hz hum present, usually not audible at standard listening levels but i've been listening to more classical music recently, and because of the larger dynamic range the hum is noticable with some recordings/volumes.
earlier this year i tried a mod i found on some site that (i think) breaks (or perhaps makes, the opposite of the stock design) the connection between the signal ground from the cartridge and the chassis of the turntable recommended for people experiencing symptoms like mine, however this made matters much worse so i put it back as it was originally.
do you think if i add an IEC 3 pin power cable and tie the chassis to earth my problem might go away? any other information on the cause of the problem/suggestions would be great.
Follow Ups:
You should be able to turn the volume all the way up with no hum.Some things to check:
Headshell clips. These need to grip the pins 'just so' and not have any continuity problems clip to clip. Also check continuity from headshell clip out to the rca plug. Before you do, disconnect the headshell leads from the cartridge, 'lest a generator coil gets fried by the multi-meter.Inside the TD145 cabinet there is a terminal where the RCA cables connect with the tonearm wires. Make sure all the solder joints are crack free. Also, there is a chassis ground between the motor plate and the floating chassis. This also needs to be intact.
One problem with solder is that it shrinks over extended time periods. This leads to cracking and, as it happens, our Thorens players are old enough to have this problem.
Oxidation on all the contact surfaces at headshell clips, cartridge pins, rca plugs and jacks. If you haven't already, I'd invest in a bottle of "ProGold" or similar connection conditioner snake oil.
Sometimes the problem isn't with the turntable but with the components it plugs into. Worth checking.
Just a few thoughts.
-Steve
I had the same problem with a TD 145 and a Grado Gold cartidge. It drove me nuts.... sold the Grado, got a Shure M97XE... problem solved.
i'm using a shure m91ED.
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