[Hallicrafters] SX-62 tuning

[radio]

Good chance you have the string improperly run - OR, as one said - 
insufficient turns on the torque wheels - that will DEFINATELY do it.  
The SX-62s I've redone (3) all experienced some manner of "tin pest" on 
the variable cap plates.  Small "bumps" of aluminum oxide that are still 
"mostly" conductive, and when they touch, the often short OR simply 
cause just enough friction to disallow the continued turning of the cap 
shaft.
Tom - W0EAJ