This is probably a question that Ron could answer before I trouble Sott or Brian.
The one 20pF capacitor supplied with my T1 kit is a small NPO (black edge) device with no voltage marking, it looks like a 50V item to me but maybe the're getting smaller.
This part is for C2 which is spec'd at 500V --- should this part carry a voltage rating?
TIA
Bill / VK4SQ