Left RCA out on DAC not working

The AECO plugs have no metal on the plug shrouds inside, apart from the pin, whatsoever.

@painter24,,

Is this what the plug looks like? I can see the signal ground contact on the bottom of the inside of the plug "shroud". Look at the bottom of the inside of the "shroud" in the photo.

Look at the photo of the cable connection plug. Note there is a center contact terminal solder connection as well as a signal ground contact terminal solder connection.

The signal ground is required. It is part of the signal circuit. Often called the signal return.

The right channel works fine no matter which ICs I use. Checked and double checked with 3 different ICs, all fully inserted.

It has to be the center pin of the plug is not making contact to the center contact in the left channel jack. It sure looks from the photo I provided the center pin on the AECO plugs have what looks like a longer center pin than normally found on RCA plugs. Is that the case or is it just the photo that makes it look that way?

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@jea48  thanks for taking the time with this; I'll take another closer look.

If I'm wrong about the AECO, any idea why the left channel would only work with these plugs, but no others? Seems a bit odd, even to my ignorant brain (in these matters) 🤔🙂

@painter24,

I edited my post and added more info to it.

@painter24,

Just to narrow the problem down to the DAC left channel RCA analog out jack did you try another set of Line inputs on the preamp to make sure it's not that left channel input that causing the problem.

Or even try swapping the right and left ICs plugs at the preamp and see if the problem follows the DAC left channel IC to the right channel of the preamp.

@jea48 thanks again; I've tried different inputs on my integrated, no problems there, and also what you described lastly. I'm kind of resigned myself with it as I am getting a replacement, but it's just the wait.