I came across a 49:1 UNUN design by OMØET which was very appealing. I decided to go to the nearest DIY shop and buy me some materials to build one myself. The priciest part was the toroid which I bought at Ferrite-shop.nl for still a reasonable price. Altogether the transformer costed about € 15,00. Not bad compared to prices in various webshops. Next on will be a 9:1 UNUN for EFLW. Same design will apply. A big thank you to Pavol, OMØET.