{"product_id":"quad-multiplex-decoder-mpx-for-use-with-a-quad-fm1-or-quad-fm2-tuner","title":"Quad Multiplex Decoder (MPX) For Use With A Quad FM1 Or Quad FM2 Tuner","description":"\u003ch1\u003eQuad Multiplex Decoder (MPX) For Use With A Quad FM1 Or Quad FM2 Tuner\u003c\/h1\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003eThis is a Vintage, 1960s, Quad Multiplex Decoder (MPX) For Use With A Quad FM1 Or Quad FM2 Tuner,  in conjunction with a Quad 22 Control Unit, made in Huntingdon, UK, by the Acoustical Manufacturing Co.Ltd (QUAD)- sold for spares\/ repairs.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eIt is a solid-state add-on unit which converts the mono valve \u003c\/span\u003e\u003cspan class=\"rQesXe MPyX\"\u003eQuad FM (FM1\/ FM2) tuner\u003c\/span\u003e\u003cspan\u003e for stereo FM multiplex (Zenith-GE pilot tone system) reception when used alongside the \u003c\/span\u003e\u003cspan class=\"rQesXe MPyX\"\u003eQuad 22 control unit.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApproximate Size (WHD)\u003c\/strong\u003e:- 8.5 x 5.2 x 18cm\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is sold without a box nor instructions, and is untested. It would probably require new internal componentry due to its \u003c\/span\u003eage and lack of use. The inside is also pretty dirty \/ dusty and needs a good clean. This has been in my hubby's collection but I've no idea where he stored it as my housekeeping skills are not that lacking as to create this level of dust! The price has been adjusted as a consequence.\u003c\/p\u003e\n\u003cp\u003eThis could be a nice restoration project for the vintage HiFi enthusiasts: see Keith Snook's excellent article on restoration \/ upgrading- https:\/\/keith-snook.info\/quad-fm1-stereo-mpx-decoder.html. \u003cmeta charset=\"UTF-8\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts internal mono-stereo electronic switching operates remotely from the QUAD 22 controls, so it may be placed within the equipment cabinet without need for access post- installation, or it can be attached directly to the rear cover\/chassis of the FM tuner-(see appended schematic).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSummary Specification For the Multiplex Decoder\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSerial No. 4579\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTransistors: 3\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eDe-emphasis: 50μS (European standards) \u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOutput voltage: 100mV (Nominal for 30% modulation) into 100K ohms \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCrosstalk: Better than 30 dB at 1 kc\/s \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuppression: 19 kc\/s \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePilot tone better than 36 dB 38 kc\/s \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSwitching tone better than 40 dB \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePower requirement: 330V DC, 8mA mono (from Yellow channel HT) plus 9mA stereo (from Blue channel HT\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease click on the following link for more \u003ca title=\"HiFi, Gramophones, Microphones\" href=\"https:\/\/mullard-antiques-and-collectibles.myshopify.com\/collections\/vintage-microphones-gramophone-hifi-musical-instruments\" target=\"_blank\"\u003evintage HiFi, Gramophone and Microphones.\u003c\/a\u003e\u003c\/p\u003e","brand":"QUAD: The Acoustical Manufacturing Co. Ltd","offers":[{"title":"Default Title","offer_id":57557995192695,"sku":null,"price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/Quad_Multiplex_Decoder_MPX_For_Use_With_A_Quad_FM1_Or_Quad_FM2_Tuner.jpg?v=1792072165","url":"https:\/\/mullardantiques.co.uk\/en-ca\/products\/quad-multiplex-decoder-mpx-for-use-with-a-quad-fm1-or-quad-fm2-tuner","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}