Philco Test Panels What Do I Have Here?

[AB3L]

Maybe someone here can tell me what these are?
I got these two years ago at a local estate sale. I don't know what they were for, maybe for the telco industry. The guy worked for Western Electric judging by the boxes stacked in the basement. The transformers were the attraction at the time.
It has UTC transformers that I can't find in the BAMA UTC pdfs. F8256 and F8255. Chicaco low pass filter and output matching xfmrs 10,000 to 600. The face plate has various test points on it. The Philco name plates are stamped 756-6484 and 756-6496. I've Googled and can't find anything there. Maybe a military item?

[Opcom]

maybe part of a frequency multiplexer for audio? Philco was a contractor for the military. The pulse balance technique basically makes a common mode pulse at one end of a balanced line, and the imbalance is measured at the other end, the the differential gain can be adjusted to null it. I can't say if that is what that means on that chassis or if that is what you have. I like those panels though.. The transformers might actually be bandpass filters?

[AB3L]

Thanks for the reply. I'm not going to try and pretend that I understand what use the pulse balance technique is used for. I'll guess for signal scrambling...?? Anyway, he had a multitude of electronics in that small house. Couldn't get a hint as to what he might have been doing for a living that would help figure out the story on this. A local ham ended up buying the whole mess and took it to his garage.

[Opcom]

well you have several channels of "something".. Looks good!