Turntable Hmmmmm


I could use some advise, here, please. I recently bought some new equipment and have been setting things up a bit at a time. I have a McCormack DNA-225, Kora Eclipse preamp, a Sony CD player, a Pioneer CD recorder, and a old Sony analog tuner all hooked up and running fine. Then, I introduced a Nottingham Spacedeck TT with Tracer #3 cartridge to the system. I had the TT and cartirdge in an another system with no problemes at all. Now, in this system, I get a very low frequency hum, barely audible at low volumes but which gets progressively louder as I add gain to the preamp. Amp and preamp are connected to one wall outlet, the rest of the components on a power strip run through a second outlet (neither dedicated). I have checked the RCA connections, the ground connection, moved the ground, swapped out outlet connections in every combination, and tried a cheater plug - all to no avail. Anyone have a sugestion on what to try next? Thanks
4yanx
If this is a regular household circuit that provides current to other lights, appliances, etc. you may wish to shut off all the other stuff one at a time to find the culprit. Assuming you are using a light source to illuminate the tt you may first want to turn that off and see if it is causing the hum. Basic advice, I know. Others with more electrical knowledge will probably post other suggestions.
Good luck,
Patrick
Try checking this thread out. If you don't feel up to the task, try reversing any non-polarized two pronged power cords in the outlets. AC polarity is VERY critical with phono systems. Sean
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http://forum.audiogon.com/cgi-bin/fr.pl?htech&1014011751&read&keyw&zzac=polarity
Thnaks for the advice. Well, I did two things. I switched a couple of the two-pronged plugs AND moved my amp a bit further from the TT. The hmmmm is GONE, but there is still a most annoying hiss (instead of blackness as with my CD). I assume this is a result of phono stage performace. No?