TV colors and bars generators

Hello, I’m tired of lurking around, dreaming about a little lab and I finally decided to dig one offer I’ve found to kickstart the video production.
I’ve found two machines for TV testing at a really good price, they’re both Italian (I’m from there) and I haven’t found much English documentation about them.
They’re

  1. Nuova Elettronica LX 539
    for which you can find the blueprints at page 102 of this magazine
    https://www.robertobizzarri.net/download/download.php?file=NuovaElettronica/Fascicoli/086-087_Nuova_Elettronica.pdf

  2. UNAOHM EP 686B
    that does the same thing but better
    https://img.clasf.it/2019/09/18/Generatore-PAL-Barre-a-colori-UNAOHM-686B-20190918050619.2383580015.jpg

Basically, from what I’ve got, they’re able to print to screen color bars, grid, chessboard; the 2. lets you vary the brightness and it has other video inputs. Thir output goes directly in the CRTV antenna input. For the 1. I know that there’s a UHF module at the end.
Do you think they’re worth the coin? I’m wondering about how I can manipulate those sources and mix them with other signals: thiking about amplification (?). At the moment I just have two CRTVs, but after this deal I’d make a trip at the local electric junk deposit and find some things.

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