Quote:
Originally Posted by ChristianFletcher
I am kind of at the stage of thinking I will just have ago and do my best I cannot make it any worse as the set doesn’t work. Valves are amazing tolerant devices.
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That's the spirit!
A couple of bits of advice: don't forget that as an auto-transformer the two windings are 2:1 in turns ratio, so that when in series you get your 3:1 step up. You might as well wind turns on until the bobbin is 1/3 full, make a tap, and then continue winding till full. That way you get maximum inductance with the wire you have.
When you bring out your terminations, leave a loop of slack as strain-relief. A break at the end is a minor inconvenience. A break at the tap or at the beginning is a disaster. If you can, double back the wire on itself a couple of times and twist, forming a cord of 3 strands or 5 strands, just for the first turn, a turn either side of the tap, and the last turn, as reinforcement.
Have fun, and put up photos!