02-05-2017, 09:59 AM
You can't go wrong if you choose a working voltage higher than the HT voltage for polypropylene and similar types.
Electrolytics should be chosen to have a working voltage higher than the maximum they are likely to encounter. This will be easy to determine for cathode bypass and similar applications but for HT smoothing it is important to realise that the HT voltage can rise considerably above its working voltage during the warm-up period. This is particularly important as you are using solid state rectifiers that have no warm-up period of their own. (Valve rectifiers can have similar warm-up periods to the output valves so there can be no appreciable rise in the HT voltage at switch on.)
Electrolytics should be chosen to have a working voltage higher than the maximum they are likely to encounter. This will be easy to determine for cathode bypass and similar applications but for HT smoothing it is important to realise that the HT voltage can rise considerably above its working voltage during the warm-up period. This is particularly important as you are using solid state rectifiers that have no warm-up period of their own. (Valve rectifiers can have similar warm-up periods to the output valves so there can be no appreciable rise in the HT voltage at switch on.)