@TubularCorporation delays produced by EL9115 sounds a bit small: looks like its typical application is compensating for delays induced by long CAT-5 cables. Though the 3 delays inside the chip can probably be chained to achieve longer delays (and even more with multiple chips). Then, chroma subcarrier frequency have a period of around 220/280ns depending on the standard, so chaining the delays inside EL9115 (180ns) would give for a bit more than 180° hue shift on composite video signals.
@VisibleSignals CBV002 uses TDA4565, which has around 1000ns/1us max delay, and a line of video in composite is 63.5/64us, so it results in a small horizontal displacement, combined with “hue shift” as the chroma subcarrier is also delayed with luma.
As for audio, analog delays made out of passive components can’t “hold” the signal for very long, and also introduce some loss/noise to the signal. Else, there is not many other ways than going digital as the Synkie does (ADC, FPGA, RAM, DAC), though not especially easy to implement, so that’s also a good reason to “misuse” analog delay chips
Interesting thread about video delays Video Delay Lines