[Tucker]

I’m recapping a Stromberg Carlson model 400h and I noticed that the wax/paper cap that connects the tone control to the chassis is rated at 1200 volts. It appears to be the original cap but the list of parts doesn’t show the voltage ratings. The other wax/paper caps are rated 600 volts or less.  
Can this cap be replaced with a 1k rated ceramic disc or a 630 v yellow cap?  I’m not sure why this cap would need to be rated for 1200 volts.  Here’s the schematic,  

http://www.nostalgiaair.org/PagesByModel...021498.pdf