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Take a look at the Philco service info. You can see there is 3.2 VDC and a 60 Vp-p signal on that 2200 pF cap. 630 volt is more than enough. 150 would even be fine. I did the same analysis on all the couplate caps and determined that 250 was fine for almost all. 500 covered the rest. Use 630 if you really want to play it safe.
I also use C0G ceramic caps. That's the type thats the most stable type of ceramic. Mica is fine too, but rather pricey for the larger sizes. I've dissected some couplates and they appear to be tubular ceramic caps except for the vertical integrator. That's some type of thick film hybrid module bult on a ceramic substrate.
I use the Vishay VR01, VR02 and VR03 series of 1, 2,and 3 watt resistors. I get them mail order from any of the major vendors. Dirt cheap, great quality and look sort of like the old carbon comps.
Yes, I use 1N5408 diodes exclusively for all my projects now. Rated for 3A and 1,000 PIV.
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