[crooner]

Those are relatively low voltage caps so it is possible they are still good. In case of the filter caps at 300 ~ 400V, reversing polarity can cause a nasty explosion!

Check them with an analog ohmmeter in the x1 range. They should give you a kick in the needle following a bigger one with the probes reversed. Of course, if you see a short when testing, do not re-use them.


As for the tube substitutions, yes, you can use the american equivalents to setup your tester.

Remember to always power the unit up slowly using a light bulb wired in series with the AC mains, or if you are fancy, a dedicated VARIAC. This should prevent major damage to your equipment in case of a wiring error or sudden shorting of a power supply cap.

Good luck!