[MadMan]

40-10-80 sounds like a can capacitor to me. 6AV6 and 6AU6 are tubes, 05- might be a .05uf cap?

Also, yeah the filters don't matter too much, but the next closest value to 40 would be 47uf. 80 would be 82. When I'm shopping on digikey, I just select the 4 or 5 closest values from the list (ie, 80, 82, 85, 88), sort by price and buy the cheapest one. Often, at least one of the values is not available anyway.

If the 5U4's are good, I don't see any reason to replace them with silicon diodes. If they're bad, I've seen shango use two pairs of two diodes in series, to drop the voltage a bit. The two 5U4's are in parallel anyway, so you'd only need to 'replace' one of them with diodes.