The name is really bad. It’s not no-tune because you need to get the length of wire correct or “tuned” as we say.
You need to measure just what you are seeing or you’ll never know what’s needed to make it better.
Mine used the same ratio (3T : 24T 1 : 8 = 64x impedance transform) and a Polyvaricon on the secondary. I followed AA5TB’s design and tuned mine the same… against a fixed resistor to get the tune point then replace with the radiator wire and trim get lowest SWR without adjusting the capcitor. 5m of radiator worked a dream(*) in that I could have 5m of vertical radiator, matchbox on the ground and a 1m counterpoise wire + 2m of RG58 to the 817. For whatever efficiency it had, I could work most of what I heard on 10/12m with it. Most failures were the problem of busting a pileup with 5W when people were running, shall we say, a bit more power
(*) for whatever definition of dream you want SWR 1blob or less on 10/12/15m and plenty of decent contacts worked (W, VE, PY, etc.). Efficiency? Who knows. There didn’t seem to be RF all over the 817 or mic or key and I could move them about and the SWR was constant.