[Chas]

1. Yes, the correct 3 contact loop ant is present but it needs new wire. 
2. I have a nice 100 speaker to go with the radio. 
3. A quick check shows continuity through all tube sockets. 
4. I have a Jefferson Tube Charger that I’ve used with’01A tubes. 
5. The Radio Receptor 28 that came with the set seems an odd choice for the radio, no high voltage, no C battery hookup, mismatched battery harness. 

1. You can get a very close replica of the Radiola loop antenna wire from Micheal Conrad here:

https://www.ebay.com/itm/333181108573

He & I collaborated many years ago I having braiders at the time, he also as well as having correct textiles.

Make the replacement wire as near exact to the existing length on the loop frame.

2. Be sure the internal coupler inside the 100 can pass the plate current for the 120 tube.

3. O.K. on filament connections but go through the complete list. Remember take the readings but the resistor strip is part of those readings, so a winding external can be open. The strip is going away be sure any no-go is internal to the cat.

4. Be sure the Jefferson tube rejuvenator can do UX-99's, FWIR it can do UV-99's but a V to UX adapter in the socket will allow U-99's. Do not plug a X-99 into the 201a socket, the higher voltages will blow the 99... That is possible to do with an adapter too.

5. The Radio Receptor would have been used with a "C" battery, there is no current taken from a "C" battery in "most" 20's radios, it will last for years. No high voltage meaning no 135 volts for the 120 tube. Well, use a 99 in the last audio and the 90 volts w/4-1/2 volts "C" works.

None the less any restoration of the RR supply will be a challenge too. The ARBE-III does it all.

Chas