[Johnson] Odd electrolytic value in Ranger

[patrick at ae1pt.com]

I was minding my own business in an antiques mall, and what did I see?  Why,
a Viking Ranger for $50.  I certainly could not leave it there, looking so
forlorn-and it followed me home.
 
It uses a 10mf @ 700V axial electrolytic in the HV supply.  The manual says
that things are in the 500VDC range for CW and Phone-but rises to 600VDC in
Standby.  
 
I found one option with Mouser, but they want $36 for a Vishay-nearly what I
paid for the rig.  Having looked elsewhere, what I found was an MEIC brand
rated at 600WVDC, with a surge factor of 650VDC.  It's a smaller package
than the Vishay.
 
Does the latter have enough latitude to run the HV rail?  Or is there some
other alternative or cap that I might have missed that someone knows?
 
Any suggestions are appreciated!

PT