Transformer success on 474.2kHz

This afternoon I inserted a small 3C90 cored transformer between the transverter and loading coil on the 15m earth-electrode antenna. Much to my surprise the best performance (25% increase in antenna current was with a step-up from 4t to 14t implying the earth electrodes look  like several hundred ohms. Success was immediate with a first spot from M0JXM (93km) and report from G3WCB (101km) some 3dB stronger at -18dB S/N. The loading coil today (soil less damp outside?) is around 50-100uH only. The transverter runs cool implying a good match.