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Luxman PD264; What's wrong with this picture?

dread31

dread31

Addicted Member
I know, it's out of focus. So, I'm no professional photographer.

But......

I have this Luxman TT that has had a hackjob interconnect cord replacement
done. It hums like crazy, and doesn't sound right. Otherwise, it looks to be in excellent condition. I would really like to restore this machine, bring it back up to top shape.

Correct me if I'm wrong, but shouldn't the green wire be connected to ground? If so, then where does the black wire go?

If this is not the problem then where should I look next?:scratch2:

Dave
 
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Can't see heads nor tails of a pic, blurry or otherwise... but usually green indicates ground, red is for positive (center post on an RCA connector) and black is neutral (outer ring on an RCA). Improper wiring --especially if it leaves the TT ungrounded to the receiver, or the cable effectively unshielded, can definitely create problems with hum.

It would be easier to help if you can get the pic to post.
 
The black wire is connected to the upper left hand post.

Cartridge is a Grado Z2+
 

Attachments

  • Headshell connection.jpg
    Headshell connection.jpg
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Okay, I did a continuity check on the headshell leads. It would appear as though I have a broken ground lead. Somewhere between the terminal lug and the headshell.

Looks like some delicate surgery is in order.

Dave
 
dread31 said:
I know, it's out of focus. So, I'm no professional photographer.

But......

I have this Luxman TT that has had a hackjob interconnect cord replacement
done. It hums like crazy, and doesn't sound right. Otherwise, it looks to be in excellent condition. I would really like to restore this machine, bring it back up to top shape.

Correct me if I'm wrong, but shouldn't the green wire be connected to ground? If so, then where does the black wire go?

If this is not the problem then where should I look next?:scratch2:

Dave
Click to expand...

Red is right channel positive, green is right channel negative, white is left channel positive, blue is left channel negative, black is ground
 
You've got the cartridge connected wrong....

Looking at the back of the Grado....
should be

Red White
Green Blue


Black should be tonearm/chassis ground only and not connected to the cartridge.
 
Guess what? It sounds a whole lot better now, but the hum is still there. My other TT also has a hum problem.

Which leads me to believe it's not the turntables.:scratch2:

So, my attention now turns to my amp.:dammit:

I've only had it for 4 years. It's an expensive amp that has had issues.
I am beginning to get a little disillusioned with the prestigious name. (Hint.)
That's an issue for another thread.

First I'll try them through another amp.

Dave
 
I'm not familiar with Luxman, but if it's a direct drive you may be experiencing the "Grado hum". Just a thought.
Is the ground wire from TT connected to the amp?
 
I guess Grado hum could be the culprit on this TT. But the other table has a ClearAudio on it. Of course it could be that the Pro-ject table has a different issue.

Also, I've experienced "Grado hum" before. And it seemed to get worse the closer the cartridge got to the motor. This is constant.

Dave
 
dread31 said:
I guess Grado hum could be the culprit on this TT. But the other table has a ClearAudio on it. Of course it could be that the Pro-ject table has a different issue.

Also, I've experienced "Grado hum" before. And it seemed to get worse the closer the cartridge got to the motor. This is constant.

Dave
Click to expand...

Dave, I don't know if this helps but, I bought a Signature model Grado MCZ when I lived in NYC. I believe Bronc told me that it was equal to the green or was it the black? anyway, I only had the hum when my finger got near the headshell. I don't use the cueing lever on the SME arm. This is on the Thorens belt drive too, no hum near the motor ever. When I moved to AZ it went away and never came back:dunno:

Craig
 
I have the Luxman, with Grado cart, hooked up to my Sansui receiver and playing as I type. Not a hint of hum. So, I believe the hum is coming from somewhere else.

(For pics, see my new thread in the "Vintage Solid State" forum.)

Dave
 
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