Capacitors + teaching

[flyturner]

Hi, another newbie here! A couple of questions as I work through past threads:
-Is there a good learning resource that someone can recommend for radio refurb.
-I'm looking to replace capacitors marked Static 0.1MFD 1000VDC Working type BTT. Looking at RS there is not an exact match - what spec should I go for. Is there a general guideline?
Thanks
Paul

[Station X]

Hello and welcome to the forums.

This is as good a place as any to start:-

https://www.vintage-radio.com/repair...ion/index.html

Info on capacitor replacement here:-

https://www.vintage-radio.net/forum/...ad.php?t=88767

[evingar]

Originally Posted by flyturner

Hi, another newbie here! A couple of questions as I work through past threads:
-Is there a good learning resource that someone can recommend for radio refurb.
-I'm looking to replace capacitors marked Static 0.1MFD 1000VDC Working type BTT. Looking at RS there is not an exact match - what spec should I go for. Is there a general guideline?
Thanks
Paul

The working voltage needs to be at least 1000V DC but can be above it (i.e 1500V DC is OK, but would be more expensive).
0.1 MFD may be marked as 0.1 uF or 100nF. 1000V may be marked 1kV

If they are axial old waxed paper type or paper types encapsulated with black "tar" then yellow polypropylene types are a good modern sub.

https://uk.farnell.com/lcr-component...20polyproplyne

[G8HQP Dave]

An unusually high DC voltage capacitor in an ordinary valve radio may be connected across the mains. If you are replacing it you should use an X-rated AC capacitor.