{"product_id":"marshall-jmp-2204-master-model-mk2-lead-50-watt-guitar-head-1978-black","title":"Marshall JMP 2204 Master Model Mk2 Lead 50-Watt Guitar Head 1978 Black","description":"\u003cp\u003e\n The Marshall JMP 2204 Master Model Mk2 Lead is one of the most iconic high-gain amplifiers ever produced, serving as the direct predecessor to the legendary JCM800 2204. Introduced in the mid-1970s, the 2204 brought Marshall's \"Master Volume\" circuit to players who wanted saturated British crunch at more manageable volumes than the non-master Plexi models. Its cascading preamp architecture delivers the aggressive upper-mid bite, tight low end, and harmonic-rich overdrive that helped define late ‘70s hard rock and early metal tones.\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n This 1978 example is housed in a black tolex enclosure and has been tastefully modified for increased flexibility. Additions include a voicing toggle switch, an effects loop, and a rear-mounted Density control which adjusts low-end tightness and saturation response. The amp is in very good condition with cosmetic wear consistent with age and use, mainly some discolored spots and lifting tolex. (See Pics)\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cb\u003e\n  \u003cstrong\u003e\n   Specifications\n  \u003c\/strong\u003e\n \u003c\/b\u003e\n\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n  Make: Marshall\n \u003c\/li\u003e\n \u003cli\u003e\n  Model: JMP 2204 Master Model Mk2 Lead\n \u003c\/li\u003e\n \u003cli\u003e\n  Serial #: 06756K\n \u003c\/li\u003e\n \u003cli\u003e\n  Year: 1978\n \u003c\/li\u003e\n \u003cli\u003e\n  Country: England\n \u003c\/li\u003e\n \u003cli\u003e\n  Condition: Very Good\n \u003c\/li\u003e\n \u003cli\u003e\n  Power Output: 50 Watts\n \u003c\/li\u003e\n \u003cli\u003e\n  Power Tubes: 2 x EL34\n \u003c\/li\u003e\n \u003cli\u003e\n  Preamp Tubes: 4 x 12AX7 + 1 x 12AX7 Loop Buffer\n \u003c\/li\u003e\n \u003cli\u003e\n  Channels: 1\n \u003c\/li\u003e\n \u003cli\u003e\n  Inputs: High Sensitivity, Low Sensitivity\n \u003c\/li\u003e\n \u003cli\u003e\n  Controls: Presence, Bass, Middle, Treble, Master Volume, Pre-Amp Volume\n \u003c\/li\u003e\n \u003cli\u003e\n  Circuit Type: Cascaded Master Volume Lead Circuit\n \u003c\/li\u003e\n \u003cli\u003e\n  Impedance Selector: 4Ω \/ 8Ω \/ 16Ω\n \u003c\/li\u003e\n \u003cli\u003e\n  Speaker Outputs: Parallel Outputs\n \u003c\/li\u003e\n \u003cli\u003e\n  Construction: PCB with Handwired Flying Leads\n \u003c\/li\u003e\n \u003cli\u003e\n  Transformers: Drake\n \u003c\/li\u003e\n \u003cli\u003e\n  Enclosure: Black Tolex Head Cabinet\n \u003c\/li\u003e\n \u003cli\u003e\n  Front Panel: Gold Brushed Aluminum JMP Panel\n \u003c\/li\u003e\n \u003cli\u003e\n  Piping: Gold\n \u003c\/li\u003e\n \u003cli\u003e\n  Knobs: Gold Marshall Pointer Knobs\n \u003c\/li\u003e\n \u003cli\u003e\n  Handle: Black Strap Handle with Metal Caps\n \u003c\/li\u003e\n \u003cli\u003e\n  Modifications: Voicing Toggle Switch, Additional Gain Stage, Effects Loop, Rear-Mounted Density Control\n \u003c\/li\u003e\n \u003cli\u003e\n  Density Control Function: Adjusts low-end response and saturation tightness\n \u003c\/li\u003e\n \u003cli\u003e\n  Special Features: Classic JMP Master Volume Circuit, Cascading Gain Stages, Modified for Expanded Tonal Flexibility\n \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\n \u003cbr\u003e\n\u003c\/p\u003e\n\u003cp\u003e\n \u003cb\u003e\n  \u003cstrong\u003e\n   What's Included\n  \u003c\/strong\u003e\n \u003c\/b\u003e\n\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n  Marshall JMP 2204 Master Model Mk2 Lead 50-Watt Head\n \u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Marshall","offers":[{"title":"Default Title","offer_id":66875428995376,"sku":null,"price":2499.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0755\/9800\/4528\/files\/f3f58485-8d53-44b2-9f5e-975b54f8bb38.jpg?v=1779925366","url":"https:\/\/diabloguitars.com\/products\/marshall-jmp-2204-master-model-mk2-lead-50-watt-guitar-head-1978-black","provider":"Diablo Guitars","version":"1.0","type":"link"}