Sorry if this is a duplicate post, I have submitted before and it did not appear to be successful.
I completed my kit earlier in the summer, all of my measurements (voltage and resistance) were correct after a little help from the forum, and then... I only get sound from the left channel. I found that if I partially backed the headphone plug out of the jack, I could hear in both the left and right headphone... but it became clear to me over time that this was simply the left channel sound coming into both headphones.
I retouched my solder joints, tried changing sources, cables, switching tubes, tried different headphones - all the same. I have not tried speakers, I do not have a pair in the office to trial.
Any recommendations? I am attaching photos of my build.