Audio mixer headphone output problem

[Brian Reynolds]

What model of mixer?
Some old shure mixes had a MONO headphone output….
Is it the same on all headphones?

[Richard Crowley]

Please identify exactly WHICH Shure mixer you are talking about.
Please identify exactly what headphones you are talking about.
Do these headphones sound OK with other gear?

[Bob Mark]

Thanks for your replies guys. It’s an old FP42 stereo mixer that I use from time to time. The headphones are Sony MDR-7506 and they sound fine on other sources. The outputs sound fine, it’s just the headphone output that sounds thin on the right side.

Here is the headphone circuit:

Thanks!

Bob

[Richard Crowley]

My immediate guess would be that C908 and/or C913 has dried out and is no longer passing low frequencies because of diminished capacitance. Or perhaps even C911.

[Bob Mark]

I was kind of thinking it might be a cap problem.
Thank you!

Bob