From My first post, an IF of 38.9 Fv IF, is related to the image rejection when the RF input is in the range 450 -860 MHZ. So if you get hold of a TV, it will have the IF transformers and filters already fitted and tuned, though they will be set wideband to encompass 32 - 41 MHZ so the sound carrier can get through it.
I worked at a place where they designed and built the highest quality receivers for broadcast use (re-broadcast receivers and monitoring receivers), they actually chose an IF of 22.5 MHZ, giving easier filters BUT reduced image frequency rejection. This was because they were fixed tuned receivers, so the RF stages were operated with better filtering.
Frank