[Test-Equipment] Singer Panoramic MF-5 Info Please

[AB3L1 at aol.com]

Hello,
 
I would like to find some manuals with schematics for the MF-5. 
 
I also would like to find the same for the VR-4, AL-2 and the UR-3 plug in  
units. The VR-4 would be the main interest of the last three mentioned. 
 
I did exchange emails with a fellow on this list about four years ago but  
lost the info due to a computer crash. I believe he was employed with Singer at  
one time.
 
Can someone tell me what the difference is between the MF-5 and the  RTA-5?
 
Thank you for the help,
 
Bob         AB3L