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THE GREAT MULLARD MAGIC BLOG — sarong

ALL ABOUT SYLVANIA SARONG CATHODE COATINGS

Posted by STEVE M on

ALL ABOUT SYLVANIA SARONG CATHODE COATINGS

In 1959, Sylvania made much of their new technology cathode coating process which they termed 'Sarong'.    The coating was characterised by an enhanced surface smoothness which to a certain extent was a 'Sword of Damocles' On the one hand, the smoothness of coating would lessen the effect of localised 'hot spots' - not much of a problem with the small signal valves shown in contemporary literature.  Conversely, there would be a reduction in surface area that could lower emission and cathode life.   As you can see, you pays your money and makes your choice. A sarong or sarung (/səˈrɒŋ/);...

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