Characteristics of HP-IL Transformers?

[Hans Brueggemann]

seems that my MK.1 eyeball needs some serious re-adjustment, as the best toroid core i could find wrt AL-factor is a TDK B64290P0037X038 at just AL=2530 nH, material grade T38 (there is another one with AL = 3600 nH, but basically unobtainable in single-digit figures).
the core can be ordered at digikey for a whopping 0.43€/ea.. three cores are required to make an HPIL transformer assembly.

for the given inductances from my previous post and the turns ratios laid out in the HP journal january 1983, p. 14, the number of turns would be as follows, where the first (pin-)number of the winding indicates the start of the winding, indicated by a small dot in the diagram:

core 1
winding 02-01: 48
winding 16-15: 12
winding 15-14: 12

core 2
winding 05-04: 103
winding 06-04: 103
winding 13-12: 24

core 3
winding 08-07: 99
winding 10-09: 33

for the windings, enamelled copper wire of 0.11 mm - 0.20 mm dia. (AWG38 - AWG32) should fit. AWG32 is already a tad on the "dense" side @ about 0.76 packing factor, which means that windings 05 and 06 should be done with extra care.