I found the guide to dismantling the phones very usefull, thank you.   I would add that you should shield at least one channel in the cable as the amount of crosstalk between the wires in this cables would be significant, the CMR would negate the crosstalk, however, it would be best if it...

I use stripped solid core ethernet cable with lose PTFE insulator as hookup  and it is as good as anything else in IMHO. interesting to hear its 99.99% pure OFC, is this true?  

I built a Bijou recently using ecc99 and a Hammond 370DAX transformer, I am very pleased with the result although the transfomer does run warm.   I stumbled accross this Lundahl ll1683 Mains Transformer recenly and looking at the specs I thought it would be good for regions that use 240/120v...