Turntable help. Phonos work independently but not together

[Farmerjake]

Hi All,

I have a very strange issue that I noticed the other night. Whilst listening to a new record I noticed some of the vocals missing. I tried the record on another system & the vocals were there.

After going through all my other cables, Listening on headphones & swapping the cartridge I decided it must be a problem with the phono's on the turntable so I replaced them with better quality plugs but....still the same issue.

The strange thing is that if you plug in the channels independently they each sound as they should but when both are plugged in the right channel takes over.

Any ideas or help greatly appreciated.

 

[JonSnell Electronic]

There is a phase shift error here. Reverse one of the head shell leads. What is happening is the left and right cancel each other out in the centre, because one channel is out of phase with each other.

 

[kevinkr]

If the bass is also missing one relative to the other it is indeed likely that the connections are incorrect (swapped) on one channel. You need to identify which channel is swapped rather than randomly reverse one versus the other, this is because on many magnetic cartridges there is a shield that is connected to one or the other channel's ground return at the cartridge, and reversing that connection might result in hum problems.

 

[Farmerjake]

Hi, thanks for all responses. I tried reversing one of the headshell leads but it's still producing the same issue.

The bass actually sounds ok it's more some of the top end stereo vocals that are missing.

 

[Farmerjake]

I've now switched the turntable itself out but still using the same cartridge & stylus & the sound Is back to full so it's an issue with the turntable itself?

Any ideas?

 

[audiofan]

It must be some wiring problem ... so you have to find diagram and then with a multimerter check to find where is the problem ..

you will probably find a pair of wire inverted ...

 

[audiofan]

I found color code

RED should connect with tip of RCA connector for right chanel

WHITE should connect with tip of RCA connector for left chanel

GREEN should connect with shell of RCA connector for right chanel

BLUE should connect with shell of RCA connector for left chanel

Then each color must be connected to corresponding pin on cartrige

 

[MAAC0]

Disconnect the shell wires and test cables for shorts with a multimeter