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EL34, MULLARD, BROWN BASE , TWIN D, DD, DOUBLE D GETTER , xF1 B0H4, BLACKBURN AUGUST 1960 PRODUCTION, 6CA7
EL34, MULLARD, BROWN BASE , TWIN D, DD, DOUBLE D GETTER , xF1 B0H4, BLACKBURN AUGUST 1960 PRODUCTION, 6CA7
Although not in the first flush of youth showing a Gm of 6.7mA/V, this valve still shows useful emission the limit of which would be 5mA/V (AVO test scale). This represents a cheap way to ensure an xF1 for stock
