12-13-2005, 12:22 PM
Hi Derek
You could use 450V electrolytics, but what you specified is just fine. Taking into consideration today's higher line voltage, the unfiltered DC from the rectifier tube will be around 350-375V.
Most of us use 600 or 630V metalized film capacitors, not only for the safety factor but for ease of stocking parts; you know, why bother with 200 or 400V units when 630V units will do, and are small enough to fit inside old cardboard tubular shells (if you restuff your caps)?
As for mica caps. For a long time, the universal school of thought was that micas were very stable and not prone to breakdown. This is no longer the case; as the original micas continue to age, even they are beginning to break down and require replacement. So, if you don't want to have to go back into your radio later on, you might wish to consider replacing the micas now, and be done with it.
You could use 450V electrolytics, but what you specified is just fine. Taking into consideration today's higher line voltage, the unfiltered DC from the rectifier tube will be around 350-375V.
Most of us use 600 or 630V metalized film capacitors, not only for the safety factor but for ease of stocking parts; you know, why bother with 200 or 400V units when 630V units will do, and are small enough to fit inside old cardboard tubular shells (if you restuff your caps)?
As for mica caps. For a long time, the universal school of thought was that micas were very stable and not prone to breakdown. This is no longer the case; as the original micas continue to age, even they are beginning to break down and require replacement. So, if you don't want to have to go back into your radio later on, you might wish to consider replacing the micas now, and be done with it.
--
Ron Ramirez
Ferdinand IN
