Did ANY tube (chassis) sets use flyback power for the CRT fil or some other low B+ so

[rca2000]

I am just curious..I was VERY surprised to find out that some early solid state BW sets have some B+ source derived from the flyback. I originally did not think this started till the early 1970's. Then...I saw the diagram for the 1968 model SS zenith 19" set--and SOME versions derive most of the low B+ sources from the fly. The fil comes from the Power tranny I believe though.

I was ALSO surprised to see that the 73 model Philco SS chassis --the one that had SCR deflection--used the fly to power the CRT fils. This IS a cold chassis--and DOES have an I-O tranny--so I expected it powered the fil. But No--it ONLY does so when the set is off. When ON--the fly takes that load. Same thing for the Motorola sets with the JA SMPS supply--in standby--a fil tranny powere the fils--BUT--when on--the SMPS does so.

BUT--does anyone out there know--did ANY tube chassis sets--have any fly derived sources(OTHER than the boost or video bias line, or "pulse" signals) for lower B+sources...like nearly ALL SS sets made after about 1978 or so? and did any of the power the CRT fils with the fly ?

Just curious...