{"product_id":"marshall-jmp-1987-hand-wired-50-watt-guitar-amp-head-1973-serviced-rev-103068841","title":"Marshall JMP 1987 Hand wired 50-Watt Guitar Amp Head 1973 - Serviced","description":"\u003cp\u003e\u003cb\u003e\u003cstrong\u003eMarshall \u003c\/strong\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003eJMP 1987 – 50W Hand Wired Head – 1973\u003c\/strong\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003eSerial Number:\u003c\/strong\u003e\u003c\/b\u003e S\/A 4140E\u003cbr\u003e\u003cb\u003e\u003cstrong\u003eInspection Sticker Date:\u003c\/strong\u003e\u003c\/b\u003e 29\/05\/1973 – 29th May 1973\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eA superb example of a \u003cb\u003e\u003cstrong\u003e1973 Marshall JMP 50 Lead Model 1987\u003c\/strong\u003e\u003c\/b\u003e, presented in very good condition and retaining an impressive amount of its original components and cosmetics.\u003c\/p\u003e\u003cp\u003eHand wired and dating from Marshall's highly regarded early-'70s period, this 50-watt non-master-volume head delivers everything you'd expect from a great vintage JMP — rich, harmonically complex mids, aggressive British crunch and exceptional dynamic response.\u003c\/p\u003e\u003cp\u003eThe amplifier retains its \u003cb\u003e\u003cstrong\u003eoriginal transformers and choke\u003c\/strong\u003e\u003c\/b\u003e, along with original Mullard mustard capacitors dating from 1972 and early 1973. Most of the original solder joints also retain their factory-applied red shellac coating, a particularly desirable detail for collectors and enthusiasts.\u003c\/p\u003e\u003cp\u003eA wonderfully original example that's recently been professionally serviced and is ready to be enjoyed.\u003c\/p\u003e\u003cp\u003eChassis \u0026amp; Originality\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cb\u003e\u003cstrong\u003eOriginal Drake 1202-118 laydown mains transformer\u003c\/strong\u003e\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003e\u003cstrong\u003eOriginal Drake 784-139 output transformer\u003c\/strong\u003e\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003e\u003cstrong\u003eOriginal choke\u003c\/strong\u003e\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eOriginal Mullard mustard capacitors, dated 1972 and early 1973\u003c\/li\u003e\n\u003cli\u003eMajority of original solder joints retain their red shellac coating\u003c\/li\u003e\n\u003cli\u003eOriginal handwired turret-board construction\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eProfessionally Serviced\u003c\/p\u003e\u003cp\u003eFreshly serviced in September 2026 by \u003cb\u003e\u003cstrong\u003eDave Wittering of Prestige Amp Servicing\u003c\/strong\u003e\u003c\/b\u003e, former Marshall senior service engineer.\u003c\/p\u003e\u003cp\u003eThe following work was carried out:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCorrect screen resistors fitted – 199-1697\u003c\/li\u003e\n\u003cli\u003eBias circuit smoothing capacitors replaced\u003c\/li\u003e\n\u003cli\u003eV1 and phase inverter anode load resistors replaced\u003c\/li\u003e\n\u003cli\u003eDedicated chassis earth fitted for electrical safety\u003c\/li\u003e\n\u003cli\u003eBoth mains voltage and impedance selectors stripped, cleaned and re-tensioned\u003c\/li\u003e\n\u003cli\u003eBoth speaker output sockets replaced\u003c\/li\u003e\n\u003cli\u003eFull professional inspection and testing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe amplifier has been carefully maintained while preserving as much of its original circuitry and character as possible.\u003c\/p\u003e\u003cp\u003eValves\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003ePower Valves:\u003c\/strong\u003e\u003c\/b\u003e Marshall-branded EL34s\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003ePreamp Valves:\u003c\/strong\u003e\u003c\/b\u003e Mixed vintage ECC83 \/ 12AX7 valves, including Mazda and HRS.\u003c\/p\u003e\u003cp\u003eCosmetic Condition\u003c\/p\u003e\u003cp\u003eThe amplifier is in \u003cb\u003e\u003cstrong\u003every good cosmetic condition for its age\u003c\/strong\u003e\u003c\/b\u003e, retaining an impressive amount of its original appearance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOriginal headshell and tolex\u003c\/li\u003e\n\u003cli\u003eOriginal handle\u003c\/li\u003e\n\u003cli\u003eOriginal Marshall logo, with some minor damage\u003c\/li\u003e\n\u003cli\u003eOriginal feet\u003c\/li\u003e\n\u003cli\u003eMinor wear to one corner\u003c\/li\u003e\n\u003cli\u003eLight age-related marks consistent with a 1973 amplifier\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAside from the corner wear and slight damage to the logo, the amplifier has survived exceptionally well for a head now over 50 years old.\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003eWorldwide Shipping Available\u003c\/strong\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eAll of our amplifier heads are shipped in \u003cb\u003e\u003cstrong\u003ecustom-made Overdrive Guitars boxes\u003c\/strong\u003e\u003c\/b\u003e, with additional internal protection to ensure they arrive safely.\u003c\/p\u003e\u003cp\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\/p\u003e\u003cp\u003eWe are proud to be an \u003cb\u003e\u003cstrong\u003eAuthorised Marshall Retailer\u003c\/strong\u003e\u003c\/b\u003e, offering new Marshall equipment alongside our carefully selected collection of vintage and pre-owned amplifiers.\u003c\/p\u003e\u003cp\u003eOur dedicated West London showroom is also available by appointment, where customers are welcome to view, test and experience our amplifiers in person.\u003c\/p\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":53855350686032,"sku":"0509","price":4250.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/0919\/5856\/files\/13f7b050-b1bc-4693-85fa-c856a20c0e7d.jpg?v=1792787616","url":"https:\/\/overdriveguitars.com\/products\/marshall-jmp-1987-hand-wired-50-watt-guitar-amp-head-1973-serviced-rev-103068841","provider":"Overdrive Guitars","version":"1.0","type":"link"}