The capacitor is VAOS p/n ZA2060, X.5 5KV MK II. It was used with the British 19 set HP, the WS22 and the WS11.
These sets had no blocking capacitor in the aerial tuning system so an external one was supplied. I think Chris mentioned in another post that the regular 19 set variometer had the cap built in so you won't see it listed in a parts list.
The capacitor introduces a higher reactance (AC form of resistance) to the lower frequency ac supply. Capacitive reactance is the inverse of the frequency. In the radio freq range aerial current passes no problem but 50 or 60 Hz is greatly attenuated reducing risk of shock.
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19-10-14, 09:53
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