Hi Michael I made a new toroid - exactly according the manual - with good solderpoints - all exact - but no success - frustration becomes larger!! What's the problem?? I can't see a problem at t5. Putting a finger between 2 and 4 (at t5) the frequency moves to 8.6 MHz (it takes about some seconds) but I can't see changing in resistance at t5. 73 de David