Hi, picked up a Canadian radio and have a couple .047 caps in it. They are rated 1100 VRMS does that stand for 1100 DCWV? Dazed And Confussed, Thanks Again, George T.

Just means peak to peak ..

I haven't been able to find a free schematic on this radio. It is a Viking RM-290-RR. It has two 1100 - .047's in it, kinda wondering if it calls for that high of voltage or if a couple 630 will do. Any help would be GREAT. It looks like it has had several repairs over it's life. George T.

Geo,
Thats an AC rating not DCWV. The DCWV would be somewhat less. It is not the peak to peak as stated by Warren. A 1100 VRMS cap would withstand approx. 1550 V peak to peak. I've found these high voltage caps typically on vibrator supplies and on the audio output tube plates.

marv

:Hi, picked up a Canadian radio and have a couple .047 caps in it. They are rated 1100 VRMS does that stand for 1100 DCWV? Dazed And Confussed, Thanks Again, George T.

Should have stated that in this case VRMS means
Volts-Root-Means-Square .. This is an AC sign wave from top to bottom of wave . ( Peak To Peak ) Most cap values are under rated somewhat. Don't know what the application is in your radio for this cap. But if it's rated that high, there should be a reason for it.

:Should have stated that in this case VRMS means
:Volts-Root-Means-Square .. This is an AC sign wave from top to bottom of wave . ( Peak To Peak ) Most cap values are under rated somewhat. Don't know what the application is in your radio for this cap. But if it's rated that high, there should be a reason for it.

As I recall my AC theory, To calculate the RMS value of a sine wave, you multiply the peak value by 0.707. The peak value is, of course, one half the peak-to-peak value. To go the other way, reverse the order of operations. That is, if you're starting with an RMS value, divide by 0.707 and then multiply by two to get the p-p value. Another way to convert from RMS to p-p is to multiply the RMS value by two square roots of two: RMS x 2 x SQR(2). (compliments of WikiAnswers)