the FT101 and the TS520's are great very nice radio's to operate on HF the only thing is with them being vac tube you do need to know how to tune them with the float and plate voltages. and bottles are getting harder to find.....
from memory the last of the 101'S the E was a solid state back end and did away with the bottles so they were alot more user freindly especially with people who were not used to the tuning of bottles......
lucky for me my father was a tech he repaired radio's but was not a ham and useing his occiloscope and wave gens and sig gens we where able to do alot of the work our selves...... i miss doing DX used to chase it all the time...
oh one thing the TS was ssb fm and CW no am the FT had all modes