Loud buzz/hum on my Technics SL-1400 MK2 with Shure VT15 type IV running type III sty

[ufotrekker]

Hi Everyone! I'm new here so please forgive me if I am not up to par on your site yet. I need some advice on how to minimize or eliminate the buzz/hum coming from my newly purchased Technics SL-1400 MKII with a Shure VT15 type IV cartridge that is fitted with a brand new stylus for the type III cartridge. I am running it through my Onkyo TX-SV70PRO Dolby Surround amplifier with Bose Acoustimass 5 Front satellite speakers with Mordant Short rear speakers.
I know, I know, old school stuff but it all works good. Using a Sansui 10 key equalizer on the whole system, and even tried grounding the ground wire in different locations and still got horrendous buzz when turned up loud. Only went away when I unplugged the turntable.
Any ideas on would be greatly appreciated. I am going to receive a Behringer P700 (I think thats' the number) phono pre-amp later this week from Amazon, and also am getting the Behringer UFO202 so I can put my 300+ albums on my PC...Would these be of any help here for the buzz?
Thanks for reading and all your help if you can...

[Number13]

First you will want to determine the source of the humming.
My experience has been that there are two likely culprits, the audio cables
or the head shell wires. You can easily test the cables by jiggling them and notice
if that haas any effect, good or bad. If so your cables are most likely shot and need to be replaced. Repair is not recommended, you will just end up doing it again.
If the cables seem ok, remove the headshell and have a look at the cartridge-to-head shell wires. If you see any black oxidation, that mey be the problem. Easily solved with a can of Deoxit or similar electronics spray cleaner.
Remove them to clean, or just replace them if that sounds easier.
Lastly, while the head shell is off, have a look at the connector, if it is dull inside it may not be providing good contact which is essential for a good ground. Also easily
fixed with a cleaner and q-tip.

[firechief]

Number13 is giving you good advice. Is the turntable plugged into the same outlet as the amp? Sounds like the ground for the incoming AC line power is not the same for both pieces of equipment.

[ufotrekker]

Thank you 13 for the great advice which is increasing my learning curve here. I haven't had a chance to go back and test or try out your advice yet, but you gave me more than I was expecting to get for my problem, and now know the methodology to use on similar situations if they ever come up.
I can't thank you or Firecheif enough for responding to my woes here. I will endeavor to utilize your advice and seek out the source of the "postal buzz" and then go from there. It's a postal buzz because after a while it makes you want to "go postal" hearing that constant buzz in the background not too far away from what you are trying to listen to.
I also received some advice from Behringer on the UFO202 USB Phono interface, and the PP400 powered pre-amp. Between you and them I hope to resolve this very soon and enjoy my records once again!