vair68robert - Adding a few 2.4 images for reference....hope they work and not too obnoxious.
16 ohm 10w resistor on 2.4 coax crossover:

Mills MRA12 8 ohm purchased for 2.4 upgrade. Also have the 2, 3, 4 and 30 ohm resistors.

What my production coax crossover looked like before installing SE upgrade kit from Rob G.

Didn't find much more constructive information on the GR Electra tube connectors beyond a few reviews and GR literature. Ran across a Smiths Connector with "Hyperboloid Contact Technology" that has similarities to the Electra tube. Just had a quick glance and didn't know whether it would be even close to applicable here. Female side was gold plated brass and male side Tellurium copper with crimp.

