I recently rescued this little set from a basement along with the Scott 6T11. I searched all over but just couldn't find the back for it. Even so, I saw a lot of potential and brought it home.
The replacement "ECHO Tube Co." 10ABP4 CRT tests like new

I think it's a rebuild.
Sure enough, it cleaned up nicely. I think Sandy might say it's "cute as a bug's ear"
For sure it's my new favorite portable.
I'd love to bring it back to life but can't a model # anywhere on it. I looked through all the Riders index but nothing matches. They were out of the TV business by 1960 so I figure it's gotta be around '57-'59.
Any ideas on the model ?
Also any thoughts about replacing that back ?
Maybe fabricate one from scratch or is there a similar model under another brand that might fit