Update: Thank you, Jim. The mystery site is KFIG (formerly KFRE) in Fresno, CA. This is what the transmitter building looks like from the outside today:
In the previously mentioned rescued file cabinet and along with the WFLY transmitter site construction information, I also found these interesting photographs:
I do not know what transmitter site this is. From the photo, it has a two-tower (guyed) directional antenna. It looks to me to be somewhere out west. The transmitter is a General Electric BTA-25 or BT-25, the same as the former WPTR and WCKY transmitter. I know this back hallway well:
This is the transformer vault:
Modulation transformer and three-pot plate transformer:
I would say that these may be promotional photos, because of the spotlessly clean installation and the plate numbers on each print. Unfortunately, there are no pictures of the front of the transmitter, including the operator console.
Does anybody know where this is?