{"product_id":"marshall-jmp50-small-box-1987-lead-model-1973-fully-serviced","title":"Marshall JMP50 Small Box - 1987 Lead Model - 1973 - Fully Serviced","description":"\u003ch1 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eMarshall \u003c\/span\u003e\u003c\/h1\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eJMP 1987 \u003c\/span\u003e\u003c\/h2\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003e50W Handwired Small Box Head – 1973\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSerial Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e S\/A 1769E\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eInspection Sticker Date:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 06\/02\/1973 – 6th February 1973\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA superb example of a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1973 Marshall JMP 50 Lead Model 1987 Small Box head\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, presented in very good original cosmetic condition and retaining its desirable original Drake transformers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDating from Marshall's highly regarded early-'70s period, this handwired 50-watt amplifier delivers everything you'd expect from a great vintage JMP — rich harmonics, aggressive British crunch, warm midrange and exceptional dynamic response.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esmall box headshell\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a particularly attractive feature of these earlier 50-watt Marshalls, offering the classic proportions and styling associated with some of the most sought-after amplifiers of the era.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis example retains much of its original circuitry, including period components and solder joints, while benefiting from a recent comprehensive professional service.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eChassis \u0026amp; Originality\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOriginal Drake 1202-118 laydown mains transformer\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOriginal Drake 784-139 output transformer\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eHandwired turret-board construction\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOriginal factory inspection sticker dated 6th February 1973\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOriginal Bulgin mains connection upgraded to a modern IEC input\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe amplifier has been carefully maintained with attention to preserving its vintage character while addressing necessary electrical and reliability considerations.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eProfessionally Serviced\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eFreshly serviced on \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e15th October 2026\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDave Wittering of Prestige Amp Servicing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, former Marshall senior service engineer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWork carried out includes:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eV1 and phase inverter anode load resistors replaced\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDedicated chassis earth fitted for electrical safety\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAll six potentiometers replaced\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAll six input and output sockets replaced\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eNew OEM Marshall ECC83 fitted in V1\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFull professional inspection and operational testing\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe amplifier is in excellent working order, fully serviced and ready to use.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eValves\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePreamp:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ECC83 \/ 12AX7, including a new OEM Marshall ECC83 in V1.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePower Valves:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Matched pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRussian-made Tung-Sol EL34B\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e output valves.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe classic EL34 output stage gives the Model 1987 its unmistakable response, combining a powerful midrange with wonderfully musical compression as the amplifier is pushed.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCosmetic Condition\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe amplifier is in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every good condition for its age\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, retaining its original:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSmall box headshell\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBlack tolex covering\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMarshall script logo\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCarrying handle\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThere are some minor signs of age and use, but overall this is a very well-preserved example of an early-'70s Marshall.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eClassic JMP 50 Tone\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eModel 1987 is one of Marshall's most celebrated amplifier circuits\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, offering much of the authority and punch of the 100-watt Super Lead but with a slightly sweeter response and earlier power-stage breakup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts traditional four-input, two-channel arrangement allows the brighter Lead channel to be combined with the warmer Normal channel, providing a surprisingly broad range of tones.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom bold, articulate cleans through to thick, harmonically rich overdrive, the JMP 50 remains exceptionally responsive to playing dynamics and guitar volume changes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA fantastic vintage Marshall for anyone looking for the authentic sound and feel of a handwired, non-master-volume amplifier from the early 1970s.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWorldwide Shipping Available\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAll of our amplifier heads are shipped in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecustom-made Overdrive Guitars boxes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with additional internal protection to ensure they arrive safely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe generally use UPS for international shipments and have extensive experience shipping vintage Marshall amplifiers worldwide, with regular deliveries to North America and Europe.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe are proud to be an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAuthorised Marshall Retailer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, offering new Marshall equipment alongside our carefully selected collection of vintage and pre-owned amplifiers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOur dedicated West London showroom is available by appointment, where customers are welcome to view, test and experience our amplifiers in person.\u003c\/span\u003e\u003c\/p\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":53978919403856,"sku":"0499","price":4499.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/0919\/5856\/files\/Classic_Marshall_Amplifier_Head.png?v=1794430846","url":"https:\/\/overdriveguitars.com\/products\/marshall-jmp50-small-box-1987-lead-model-1973-fully-serviced","provider":"Overdrive Guitars","version":"1.0","type":"link"}