Welcome Konrad. I believe the readings are near correct. The 100 ohms should be 105, and the 38 ohm should be 36 (?)
Frankly, the ballast tubes are not all that reliable. If you have a heater in any of the tubes fail, then change in current draw can destory the part of the ballast. All the tube consists of are some thin wires between mica plates.
If you have the time and money, i would consider replacing it with some surface mount 25watt resistors. Phil Nelson ( a member here) has a great article on the restoration of a TS-18 channsis in a moto MV-73
here scroll down a bit to see how he replaced the ballast tube.