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 Some clarification on ecap P.V marking
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 Return to top of page · Post #: 1 · Written at 8:26:44 PM on 30 May 2017.
Olivert's Gravatar
 Location: Melbourne, VIC
 Member since 30 May 2017
 Member #: 2120
 Postcount: 2

Hello all. First time newbie radio enthusiast and poster here.

Hoping someone can educate me on re capping my second radio. I have a paper electrolytic capacitor with a P.V of 600 I'm assuming that means peak voltage? Other capacitors have the DCVW marked so I then replace the cap with an equivalent rating.

My question is, what is the method for replacing a paper Ducon electrolytic capacitor with only a P.V marking. The cap is an 8 μF with a P.V of 600 Ducon type ET 10554. 2 of these guys across the audio path maybe filter capacitors. I'm confused to why it wouldn't tell me the working voltage.

Pretty sure the radio is a Metropolis 4. But it's completely un marked. Any help appreciated!

 Return to top of page · Post #: 2 · Written at 8:57:01 PM on 30 May 2017.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1133

G'day & welcome to the Forums.

The working voltage for a 600 PV Ducon electrolytic capacitor is 500 volts. The peak or surge voltage is the maximum the capacitor will momentarily withstand before it will let go of its guts.

 Return to top of page · Post #: 3 · Written at 12:44:44 PM on 31 May 2017.
Robbbert's avatar
 Location: Sydney, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1380

The reason for the peak voltage is that on a radio with a filament rectifier (such as 5Y3GT), it heats up much faster than the others, so for a few seconds there is a very high voltage on the capacitor. When the output valve warms up it drains some voltage thus bringing it down to the working voltage. If you're buying a replacement make sure that it will survive the peak voltage (in other words get a 600 volt capacitor).

 Return to top of page · Post #: 4 · Written at 3:18:52 PM on 31 May 2017.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1574

Olivert I sell the appropriate capacitors

 Return to top of page · Post #: 5 · Written at 4:50:15 PM on 31 May 2017.
Olivert's Gravatar
 Location: Melbourne, VIC
 Member since 30 May 2017
 Member #: 2120
 Postcount: 2

Thanks for the help! I'm really looking forward to getting started.

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