Philips bypass capacitors in 203U - Specifications? (Techniek Radio/TV)

door Laurens , Zaandam, 02.03.2023, 21:25 (631 dagen geleden) @ Robert Lozier

The pitch coated capacitors aren't specifically meant for tropicalized radios - they were just 'the' standard Philips paper capacitor.

Out of all paper capacitors, it's one of the least bad types. But they're now well past their 'sell by' date. If you're only gonna turn on the radio for 15 minutes every month, you can leave most (but not all) of them in place. For a reliable set that you can turn on for hours at a time, all have to be replaced.

They're better than Wima Tropydur capacitors (the taffy or candy-shaped, often shiny capacitors).

There are vendors that sell unused pitch-coated capacitors - don't buy them. Even when you don't use them, the chemical process that degrades the paper continues.

There's one exception: using them in low voltage applications (12v max). The leakage of these caps varies with the applied voltage, and the 400v capacitors can be completely acceptable in circuits where they only see 12v. Like in DIY radios with battery tubes.

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