{"product_id":"1940-air-ministry-am-tester-microphone-type-1-10a-8243-made-by-ferranti","title":"1940 Air Ministry AM Tester Microphone Type 1 10A\/8243 Made By Ferranti","description":"\u003ch1\u003e1940 Air Ministry AM Tester Microphone Type 1 10A\/8243 Made By Ferranti\u003cbr\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThis strange looking device is a WW2 1940 Air Ministry AM Tester Microphone Type 1 10A\/8243 Made By Ferranti.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eA very nice RAF test set related to all the ~WT voice sets. The inbuilt Ferranti voltmeter (scale: 0-10 volts) has the RAF stores reference number 10\/8250 with a resolution of 1000 ohm\/volt. It was designed to test the sensitivity of carbon microphones and worked in conjunction with a noise generator (10A\/ 10154) which is not included.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eIn pretty good condition, there is damage on the left hand side of the top of the jointed mahogany case, which also has various scuffs and blemishes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eApproximate Size (WHD): 17 x 13.2 x 12.5 cm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSold as a collectible for display only, a nice piece of ephemera for the \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/militaria\" target=\"_blank\"\u003emilitaria\u003c\/a\u003e collector!\u003c\/p\u003e","brand":"Air Ministry","offers":[{"title":"Default Title","offer_id":43637958902017,"sku":"","price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/products\/1940_Air_Ministry_AM_Tester_Microphone_Type_1_10A_8243_Made_By_Ferranti.jpg?v=1733572999","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/1940-air-ministry-am-tester-microphone-type-1-10a-8243-made-by-ferranti","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}