Back on top with the access cover removed you can see the trimmer caps used to set the high end of each band.
Removal of the other access cover on top and the coils used to set the low end each band are seen here.
The bottom cover also is ribbed to stiffen it up.
This VFO is a solid design in spite of being band switched.
The conbination make for a reasonably good radio back in the day, It's still is a good radio for rag chewing, while not a high preformance radio one would use for DX'ing it is pleasent to listen to and for being over 50 years old quite stable. I haven't ran the radio across my bench yet to see how well the receiver preforms, I'll do that after I finish the 8569B project.
At 220W out it is very capable for daytime 40 meter use.
Using the Swan-400 to drive my SB-220 I have to keep the drive around 125W, much more and there is too much grid current and I would be in danger of damaging the tubes in my SB-220. I don't have the VOX unit for this radio, I had one that came with my Swan-350 but it needed to find a new home with a friend.
Herb Johnson was good at designing ham gear to a cost.
So I now have three Swan radios in my modest collection, a 350, 500CX, and my Swan-400.
I also have two Atlas radios, Johnson went on to form Atlas Radio in the early seventies.
I have an Atlas 215, and a 350 with a power supply.
Fun stuff....