[jwidner]

Hi and welcome to the Phorum!
Your .5 @600v is the cathode bypass cap for the IF amp. Value is not real critical but should be .1 or bigger. Voltage wise  600 is way overkill as there is probalby less than 5-10vdc there. Would just rebuild block cap w/original values.

Terry

Thanks to both of you for the response.  I just want to make sure I made myself clear by double-checking the responses. I am aware of the bakelite, which contains the two .1 mf and .01 mf, but what is not in the schematic is the .5 mf 600 v DYRT paper capacitor enclosed in the silver box in the original photo.  I don't see it in the schematic at all. See attached to this reply how the .5 was added to the circuit at the point where I have the blue lined jumping off point drawn.  Is that what you referred to in your response, Terry?  I have already rebuilt the bakelites, Bob, as I have done that before.  I circled the .1 and .01 and marked it bakelite to let you know that is what it was.  I wasn't actually referring to it as much as that DYRT .5 addition.  Terry, if it is an IF cathode bypass, is this something that might have been added later by Philco on later versions of the 610?

   

Thanks for all patience and advice!

Jim