{"product_id":"copy-of-1920s-mullard-pm3-radio-triode-valve-in-its-original-box","title":"1920s Mullard PM3 Radio Triode Valve In Its Original Box","description":"\u003ch1\u003e1920s Mullard PM3 Radio Triode Valve In Its Original Box\u003c\/h1\u003e\n\u003cp\u003eThis amazing collectible is a late 1920s Mullard PM3 Radio Triode Valve In Its Original Box; where PM stands for Philips-Mullard. A nice display item for the office or radio shack!\u003c\/p\u003e\n\u003cp\u003eIt is over 90 years old, has never been used and hasn't been tested. As a piece of radio history made by Mullard Radio Valve Co. Ltd, Nightingale Lane, Balham, London, \u003cspan style=\"color: rgb(255, 42, 0);\"\u003eit is being sold as a collectible for display only.\u003c\/span\u003e According to \u003cem\u003eThe\u003c\/em\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003e History of the British Radio Valve to 1940, \u003c\/em\u003ethe valve was introduced in 1926.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eThis is a late 1920s version of both valve and box. It has its original paper label with the warning \"\u003cspan class=\"c8\"\u003eTHERE IS PRACTICALLY NO GLOW FROM THIS FILAMENT\u003c\/span\u003e\" and information about the filament voltage and current, and maximum anode voltage. An early owner has handwritten some test data on the paper label in 1931 and 1933. It also comes with its technical leaflet.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe cardboard box, without the cut out in the lid for the valve pins, is intact with scuffs and blemishes commensurate with age and storage. The colours have faded but are still legible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOriginal Specification:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Mullard Radio Valve Co.Ltd etched on the side in white with the series no. D218\u003c\/li\u003e\n\u003cli\u003eType: Universal Vacuum Triode\u003c\/li\u003e\n\u003cli\u003eMarked with the BBC logo on the side\u003c\/li\u003e\n\u003cli\u003eBase: 4-Pin B4 with tubular pins with two slots\u003c\/li\u003e\n\u003cli\u003eFilament: \u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eMaximum Voltage 4 Volts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eCurrent ~0.075 amps (\u003cspan style=\"color: #2b00ff;\"\u003eNB: The current was reduced to from 0.1 to 0.075 amps in the late 1920s versions) \u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003eAnode Voltage 150 Volts\u003c\/li\u003e\n\u003cli\u003eFor Detection, High or Low Frequency Amplification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease click on the following links for more \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/thermionic-valves-tubes\" target=\"_blank\"\u003evintage valves\u003c\/a\u003e and \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/amateur-radio-equipment\" target=\"_blank\"\u003eradio ephemera\u003c\/a\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"Default Title","offer_id":43946276389121,"sku":"","price":40.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/1920s_Mullard_PM3_Radio_Triode_Valve_In_Its_Original_Box.jpg?v=1761571773","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/copy-of-1920s-mullard-pm3-radio-triode-valve-in-its-original-box","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}