Interesting question.
I have several B&K 1077B's - functionally the same as your 1076. One of mine came with some probes but they were pretty cruddy and I just assumed they were straight through.
I ordered a few of these:
http://www.ebay.com/itm/320848757247...84.m1439.l2649
I have only used my 1077B's to put up a test image. Have not injected signals to debug a circuit yet. But, looking forward to using the 1077B when I get my next TV.
I think other than the Flyback testing that the probes are basically straight through. You *might* need a capacitor between the TV and the B&K test probe for certain uses.
I have the B&K 1076 manual in PDF format if you need it.
There is a book that shows how to use the B&K 1076:
Television Analyzing Simplified - by Milton S. Kiver
I really like this book.
Don't recall anything in the book about the probes. So, your question has piqued my interest too.
Now the "sister" device to these is the B&K 415 Sweep/Marker generator. It has a few probes that are definitely not straight through.
Carl