Most likely a ground issue on the 6200. Check the tonearm ground and ensure the phono ground wire is connected to the preamp ground.
Turn Table Decision
I bought my first TT in 1979 while a freshman in high school -.a Dual CS508 ULM, and I still have it, currently with an inexpensive Audio Technica cartridge, I was using it until very recently, when I received in a trade a Marantz 6200 with a Shure v15 type IV cartridge. The problem is the Marantz has a hum. Both channels, volume-dependent. I reconnected the Dual and there is no hum, so I am pretty sure it is the Marantz. I played around with my multimeter, and I cannot find anything obvious.
So my question is: Do I spend $100-$200 (guessing) to fix the Marantz, or do I just stick with the Dual (or do I suck it up and buy a better TT)?
The rest of the system, if it helps: Acoustic Research AR3a speakers; Audio Research M100 tube monoblocks; JENA Labs interconnects; conrad-johnson PV12 tube preamp with phono stage; and a McIntosh MR67 tube tuner.
Thanks.
So my question is: Do I spend $100-$200 (guessing) to fix the Marantz, or do I just stick with the Dual (or do I suck it up and buy a better TT)?
The rest of the system, if it helps: Acoustic Research AR3a speakers; Audio Research M100 tube monoblocks; JENA Labs interconnects; conrad-johnson PV12 tube preamp with phono stage; and a McIntosh MR67 tube tuner.
Thanks.
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@ bkrpdx Shure cartridges have a ground tab on the right channel. If the tab is on the cartridge it should be removed. These are the instructions from the Shure website. Give it a shot! CONNECTIONS (see Figure 1): R~ght "hot" lead (usually red) to "R," rlght ground (usually green) to RG " Left "hot" lead (usually white) to "L," left ground (usually blue) to "LG " If metal head IS causing ground loop hum, remove the ground tab The metallic cartrldge shleld is disconnected from the right channel ground by the removal of the ground tab |
If the above procedures did not work Here’s a quick debug procedure that might help... - get a length of wire - about 6 ft - attach one end to the ground pin only on a mains plug - strip about 1/8" of insulation from the other end - you now have a grounding lead Insert the plug into any outlet - touch the other end at various points on the arm to test it for grounding - start at the head and work towards the back If the hum goes away then the arm( or maybe the TT) needs to be grounded properly If the hum does not go away - everything is grounded as it should be and the problem is probably inside the Turntable OR at the cartridge You could also try - touching the open end of the ground lead to the neutral side of the RCA jack on the cable where the TT wire plugs into the pre-amp If the hum goes away you can permanently fix the issue by connecting the open end of the grounding lead to the neutral side of an RCA plug and connect it to any unused RCA jack on the pre-amp. Whilst this is not the perfect solution it will not harm any components But I also concur with @ebm - your system components "deserve" a better turntable - technology has come a long way since either of the two turntables you mention, Regards - Steve |
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