I've only worked on FT-101, B and E.
Never worked on an EE EX or an F.
These radios came at a critical time in American amateur radio. Companies like Swan, Drake Heath and National, to name a few were resting on their laurels, they had gear that worked and a price point they wanted to keep...
Yaesu and Trio (Kenwood among others like JRC) wanted to get into the American amateur radio market, many of their offerings were marginal, but today are sought after by collectors.
Yaesu in cooperation with Henry Radio made inroads into the American amateur radio market. The first FT-101s came over with 11 meters pre-installed this made for lots of sales to CB'ers (mainly the SSB types) soon the American CB market was flooded with FT-101s. This started something that couldn't be stopped in the very early seventies.
After Yaesu made their splash with the FT-101 (no A E etc) Swan jumped on the band wagon and offered up the Swan 1011 today it is a very rare radio it was like someone at swan arranged a collision between a 270 and a 500C The radio looks like a Swan 500 series radio but has the guts of a Cygnet 270. Swan caught a lot of heat for this move from the ARRL there was a rather nasty editorial in QST, and because of this Swan formed a new company just for it's illegal CB products called Siltronix. Swan said they would no longer produce the 1011 under the Swan name. You are not likely to ever find a swan 1011 they made less than a hundred. Siltronix 1011Bs are rare for some reason and they made hundreds of those. (they were the best of the 1011 series)
Yaesu wasn't the only manufacturer from Japan who made 11 meter capable radios. Kenwood did also My R-599A came with 11 meters and all you had to do was cut a wire in the T-599A to make it transmit on 11 meters. Heathkit in a backhanded sort of way was already on the bandwagon If you had any HW or SB series radio all you needed to do was order up a 404-313 crystal this was used in the SB-310 short wave receiver, that rock would put any piece of HW or SB series ham gear on 11 meters.
Henry radio was also on the CB bandwagon; The Tempo-0ne could be converted to CB and all you had to do was ask the guy at Henry Radio to install the CB crystal.
I bought two T/O parts radios to make a good one, the second one came with not just one but the whole set of 26-28MHZ crystals.
As the seventies progressed you couldn't find a piece of ham gear that wasn't modifiable for 11 meters, many of the manufacturers depended on this to sell radios.
There are three things that seemed to kill the market.
1. the sun spot cycle
2. cheap imports like the Palomar 2400, Cobra DX, Superstar 360 and many more.
3. The No Code License.
All those people who were buying modified ham gear just went and got their ham licenses. In spite of how easy it was to modify a more modern Icom or Kenwood radio.
There is one thing I have noticed you don't have from that day Radio Tech...
A Jonson Messenger 350.
There is a radio that makes the best 10 meter QRP radio with only a little help
If you have them go to Sams Photofact CB series #14.
I have one in that garage that is stock, untouched (except for the coax that went to an HP 8640 sig gen to be used as a VFO.).