xref colors not updating - Dating mullard valves


All these individual elements take their place in the overall history of the thermionic valve or vacuum tube.During its history the vacuum tube or thermionic valve has played a pivotal role in many historical events and its invention has changed the way of everyday life.

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Shorn of the mains power supply components it even appeared in a battery portable set! It originally belonged to the Gaumont-British Film Co.

and later passed into the hands of the Rank Organisation.

A recent message in the forum requested information about reproducing the Bush logo. Despite the use of series-heater valves, the AC11 is an AC only set.

Peter Hughes kindly scanned a page from a book showing the dimensions etc., and emailed it to me. The heaters are connected in series and operated from a suitable tapping on the secondary of the mains transformer.

As the need to valves / tubes grew, so did the requirements for their performance.

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