They are nice sets when restored. Very straight forward. You can get a reproduction rubber face mask from this guy:
http://www.renovatedradios.com/productlist.php
Sweep coupling capacitors can be purchased from:
https://www.justradios.com/
Don't use disc capacitors to couple the sweep to the deflection plates in the CRT. They don't work as well.
Of course, if the CRT, 7JP4 is a dud, that can be a problem!
Please, keep us informed.