UTC Z-2961 input transformer

[mltube]

Any good use for these? These were given to me by a good friend, but I cannot find any data on this model.
It came out of a RCA Video reel to reel machine that was parted out at a local TV station. The machine was from the sixties and all solid state.
Thank you in advance for any information you may have.
Cheers
mltube

[mltube]

Here is another, but much larger. I measured the DCR on all legs, very low resistance here.
Unsure what this one was used for in the video machine, any ideas?...
Thank you

[mltube]

Here is the las one. Unknown, from the same RCA video machine.
I hope that I can find a use for these, (Did I say they were FREE!!)
Just hoping someone may have an idea or two.
I'm almost sure the smaller UTC's in the first post can be arranged for input, but I have never had the money to do transformer input yet.
This may be a first...
Once again thank you for any input you may have (good or bad).
mltube