{"product_id":"marshall-jmp-1992-mk-ii-super-bass-100-watt-guitar-bass-amp-head-1978-serviced-rev-102971532","title":"Marshall JMP 1992 MK II Super Bass 100-Watt Guitar \/ Bass Amp Head 1978 - 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 Super Bass 100W Model 1992 – Original Dagnall Transformers – Fully Serviced\u003c\/strong\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eA fantastic example of a \u003cb\u003e\u003cstrong\u003e1978 Marshall JMP Super Bass 100\u003c\/strong\u003e\u003c\/b\u003e, presented in very good vintage condition and retaining its original Dagnall mains and output transformers, along with its original Drake choke.\u003c\/p\u003e\u003cp\u003eManufactured during Marshall's legendary JMP era, this is a great example of the iconic 100-watt Super Bass, renowned for its enormous headroom, thick low-end response and rich, dynamic valve tone.\u003c\/p\u003e\u003cp\u003eThis particular amplifier carries serial number \u003cb\u003e\u003cstrong\u003eSB\/A 05809K\u003c\/strong\u003e\u003c\/b\u003e, with its original inspection label dated \u003cb\u003e\u003cstrong\u003e28th June 1978\u003c\/strong\u003e\u003c\/b\u003e, confirming its year of manufacture.\u003c\/p\u003e\u003cp\u003eImportantly, the amplifier retains all three of its original transformers, including the desirable Dagnall T4074 mains transformer, Dagnall C2668 output transformer and Drake T100 choke.\u003c\/p\u003e\u003cp\u003eRecently serviced by \u003cb\u003e\u003cstrong\u003eDave Wittering of Prestige Amp Servicing\u003c\/strong\u003e\u003c\/b\u003e, a former senior Marshall service engineer with 15 years at the Marshall factory and over 35 years of experience, the amplifier has been carefully maintained with reliability and safety in mind, while preserving its vintage character.\u003c\/p\u003e\u003cp\u003eSpecifications\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e\u003c\/b\u003e Marshall Amplification\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e\u003c\/b\u003e JMP Super Bass 100 – Model 1992\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eYear:\u003c\/strong\u003e\u003c\/b\u003e 1978\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eSerial Number:\u003c\/strong\u003e\u003c\/b\u003e SB\/A 05809K\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eInspection Date:\u003c\/strong\u003e\u003c\/b\u003e 28th June 1978\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eCountry of Manufacture:\u003c\/strong\u003e\u003c\/b\u003e England\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eOutput:\u003c\/strong\u003e\u003c\/b\u003e 100 Watts\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eChannels:\u003c\/strong\u003e\u003c\/b\u003e Two channels, four inputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eCircuit:\u003c\/strong\u003e\u003c\/b\u003e All-valve, non-master-volume\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eMains Transformer:\u003c\/strong\u003e\u003c\/b\u003e Original Dagnall T4074\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eOutput Transformer:\u003c\/strong\u003e\u003c\/b\u003e Original Dagnall C2668\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eChoke:\u003c\/strong\u003e\u003c\/b\u003e Original Drake T100\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003ePower Valves:\u003c\/strong\u003e\u003c\/b\u003e Matched quad of JJ EL34L\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\u003cstrong\u003eRectification:\u003c\/strong\u003e\u003c\/b\u003e Solid-state\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRecent Service \u0026amp; Maintenance\u003c\/p\u003e\u003cp\u003eThe amplifier has recently undergone a comprehensive service by \u003cb\u003e\u003cstrong\u003eDave Wittering of Prestige Amp Servicing\u003c\/strong\u003e\u003c\/b\u003e, ensuring it is ready for regular use.\u003c\/p\u003e\u003cp\u003eWork carried out includes:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAll input and output sockets replaced with OEM Cliff jacks.\u003c\/li\u003e\n\u003cli\u003eAll potentiometers replaced.\u003c\/li\u003e\n\u003cli\u003eV1 cathode bypass capacitor replaced.\u003c\/li\u003e\n\u003cli\u003eBias circuit smoothing capacitors replaced.\u003c\/li\u003e\n\u003cli\u003eMains IEC socket replaced for improved electrical safety.\u003c\/li\u003e\n\u003cli\u003eDedicated chassis earth connection installed for improved safety.\u003c\/li\u003e\n\u003cli\u003eFitted with a matching quad of JJ EL34L output valves.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAll replacement components used during servicing are genuine Marshall OEM parts wherever possible, maintaining the amplifier's original specification and character.\u003c\/p\u003e\u003cp\u003eCrucially, the original Dagnall transformers and Drake choke remain in place.\u003c\/p\u003e\u003cp\u003eCondition\u003c\/p\u003e\u003cp\u003eThe amplifier is in \u003cb\u003e\u003cstrong\u003every good vintage condition\u003c\/strong\u003e\u003c\/b\u003e, particularly considering it is approaching 50 years old.\u003c\/p\u003e\u003cp\u003eThe original-style black covering displays some minor snags, scuffs and small dings consistent with age and use, but nothing that detracts significantly from its overall appearance.\u003c\/p\u003e\u003cp\u003eThe Marshall front logo has been replaced, and the amplifier presents very well overall.\u003c\/p\u003e\u003cp\u003eInternally, the amplifier has benefited from professional servicing, with sympathetic component replacements carried out where necessary to ensure continued reliability and safe operation.\u003c\/p\u003e\u003cp\u003eTone \u0026amp; Performance\u003c\/p\u003e\u003cp\u003eThe Marshall Super Bass is one of the great classic British valve amplifiers, sharing much of its DNA with the legendary 100-watt Super Lead but offering a slightly warmer, fuller and more rounded response.\u003c\/p\u003e\u003cp\u003eOriginally designed for bass guitar, the Super Bass quickly became a favourite among guitarists seeking enormous clean headroom, rich harmonic overdrive and a powerful, dynamic response.\u003c\/p\u003e\u003cp\u003eCompared with the Super Lead, the Super Bass typically offers a thicker low end, smoother high frequencies and a wonderfully open midrange.\u003c\/p\u003e\u003cp\u003eWhen pushed, the amplifier delivers a huge, organic overdrive with exceptional note definition, rich harmonics and the unmistakable character of a vintage Marshall JMP.\u003c\/p\u003e\u003cp\u003eAn outstanding choice for both guitar and bass players looking for authentic late-1970s Marshall tone.\u003c\/p\u003e\u003cp\u003eWorldwide Shipping\u003c\/p\u003e\u003cp\u003eWe offer worldwide shipping on all our amplifiers.\u003c\/p\u003e\u003cp\u003eEvery amplifier is carefully packaged using custom-made, heavy-duty shipping cartons, with particular attention paid to protecting delicate components during transit.\u003c\/p\u003e\u003cp\u003eWe regularly ship vintage amplifiers throughout the UK, Europe, North America and beyond.\u003c\/p\u003e\u003cp\u003eAll shipments are fully tracked and insured.\u003c\/p\u003e\u003cp\u003e\u003cb\u003e\u003cstrong\u003eOverdrive Guitars – Vintage \u0026amp; Modern Amplifier Specialists | Authorised Marshall Retailer\u003c\/strong\u003e\u003c\/b\u003e\u003c\/p\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":53855350718800,"sku":"0237","price":2299.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0944\/0919\/5856\/files\/26f93e82-dd13-4f51-a055-3349d3ad0490.jpg?v=1792787617","url":"https:\/\/overdriveguitars.com\/products\/marshall-jmp-1992-mk-ii-super-bass-100-watt-guitar-bass-amp-head-1978-serviced-rev-102971532","provider":"Overdrive Guitars","version":"1.0","type":"link"}