{"product_id":"all-original-1966-marshall-jtm45-mkii-plexi-50w-head-serviced-kt66-power-tubes-original-tolex-pots-knobs-very-good-condition-at-maharsvintageguitars-com","title":"Marshall JTM45 MKII 1966 Plexi 50 Watt Head Serviced","description":"\u003cp\u003e\u003cstrong\u003eNo sales tax for US customers outside California.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1966 Marshall JTM45 MKII Plexi 50-watt head is one of the most historically significant amplifiers ever built. This is the amp that defined British rock tone, the one Clapton, Townshend, and Page plugged into before the world knew what a Marshall even was.\u003c\/p\u003e\n\u003cp\u003eThe JTM45 began as Jim Marshall's interpretation of the 1959 Fender Bassman circuit, but the substitution of ECC83 preamp tubes and KT66 output valves gave it a character distinctly its own: thicker in the midrange, more compressed at the top end, with a harmonic richness that the original Bassman never quite achieved. By 1966, the final year of JTM45 production, Marshall had refined the design to what many consider its peak form — the transition to aluminum-faced Plexiglas panels was underway, and this amp sits right at that historically loaded moment. At 50 watts through a pair of KT66s, it has considerably more headroom than its name implies, but push it into breakup and you get that unmistakable bloom and sag that no modern amplifier has fully replicated.\u003c\/p\u003e\n\u003cp\u003eThis example presents in Very Good condition — cosmetically solid with original tolex, original knobs, handle, and pots intact. The amp has been professionally serviced, with filter caps replaced as part of that work, and it runs a grounded power cord for safe modern use. Tube complement currently installed includes a Mesa 5U4GB rectifier, a pair of Marshall-branded KT66 power tubes, and a mixed preamp set of Sylvania, unknown, and JJ ECC83\/12AX7 types.\u003c\/p\u003e\n\u003cp\u003eDating is confirmed through internal codes rather than a visible label — consistent with how Marshall documented production in this period. Transformer details are documented in the photographs. The cabinet measures 25.76\" wide by 9\" tall by 8.25\" deep and weighs in at 32 lbs 14 oz — compact by modern standards, substantial in hand. Extension speaker outputs are present. \u003c\/p\u003e\n\u003cp\u003eThis amp is built for the player or collector - roll back the volume and it delivers a warm, touch-sensitive clean that responds to pick attack in a way that modern circuits simply don't. Open it up and it does blues, rock, and everything in between with a directness and physicality that is deeply addictive. If you've been chasing this sound through pedals and modern clones, this is the source material.\u003c\/p\u003e\n\u003cp\u003eThe output transformer is replaced, a pretty common change on these older Marshalls.  The back panel is missing.  \u003c\/p\u003e\n\u003cp\u003eA genuine 1966 JTM45 MKII in this condition is not something that comes through often. These amps shaped the sound of rock music more than almost any other single piece of equipment, and the window to own one at anything resembling a reasonable price continues to narrow. If this is the amp you've been looking for, act accordingly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBrand: Marshall\u003cbr\u003eModel: JTM45 MKII Plexi 50-Watt Head\u003cbr\u003eYear: 1966\u003cbr\u003eDate Noted: Internal codes\u003cbr\u003eWatts: 50\u003cbr\u003eColor: Black\u003cbr\u003eDimensions: W 25.76\" x H 9\" x D 8.25\"\u003cbr\u003eWeight: 32 lbs 14 oz\u003cbr\u003eRectifier Tube: 5U4GB (Mesa)\u003cbr\u003ePower Tubes: 2 x KT66 (Marshall-branded)\u003cbr\u003ePreamp Tubes: 12AX7 (Sylvania), 12AX7 (?), ECC83 (JJ)\u003cbr\u003ePower Transformer: See photos\u003cbr\u003eChoke Transformer: See photos\u003cbr\u003eOutput Transformer: See photos\u003cbr\u003eFilter Caps: Replaced (serviced)\u003cbr\u003ePots\/Codes: Original\u003cbr\u003eTolex: Original\u003cbr\u003eKnobs: Original\u003cbr\u003eHandle: Original\u003cbr\u003ePower Cord: Grounded\u003cbr\u003eExtension Speaker Out: Yes\u003cbr\u003eReverb\/Effects: No\u003cbr\u003ePedal: No\u003cbr\u003eCase\/Cover: No\u003cbr\u003eCondition: Very Good\u003cbr\u003eServiced: Yes\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExcerpts from real online end-user reviews:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\"Electronically, these early Marshalls are basically clones of the 1959 Fender Bassman amp, but the use of different preamp (ECC83) and power amp (KT66) tubes in the JTM45 gave them a raucous character all their own.\" - Reverb.com\u003cbr\u003e\"Roll off the volume and you get a pretty nice clean out of it. Add just a touch more volume and it will do blues all day. They take OD pedals great.\" - Reddit, r\/GuitarAmps\u003cbr\u003e\"Soon you could hear Marshalls on nearly every record coming from England, and subsequently in the recordings of generations of guitarists around the world that they inspired.\" - Premier Guitar\u003c\/p\u003e\n\u003cp\u003eWe buy, sell, and take trades.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBe sure to check out the other cool guitar related stuff on our site!\u003c\/strong\u003e\u003cbr\u003eThe largest \u003ca href=\"https:\/\/www.maharsvintageguitars.com\/collections\/amps\" title=\"Vintage and used guitar amplifiers at Mahar's Vintage Guitars\"\u003e\u003cstrong\u003evintage \u0026amp; used guitar amplifier selection\u003c\/strong\u003e\u003c\/a\u003e in Northern California\u003cbr\u003e\u003ca href=\"https:\/\/www.maharsvintageguitars.com\/collections\/vintage-fender-guitars\" title=\"Vintage and used Fender guitars at Mahar's Vintage Guitars\"\u003e\u003cstrong\u003eFender electric guitars\u003c\/strong\u003e\u003c\/a\u003e - vintage \u0026amp; used\u003cbr\u003e\u003ca href=\"https:\/\/www.maharsvintageguitars.com\/collections\/gibson-guitars\" title=\"Vintage and used Gibson guitars at Mahar's Vintage Guitars\"\u003e\u003cstrong\u003eGibson electric guitars\u003c\/strong\u003e\u003c\/a\u003e - vintage \u0026amp; used\u003cbr\u003e\u003ca href=\"https:\/\/www.maharsvintageguitars.com\/collections\/effect-pedals\" title=\"Vintage and used effects pedals at Mahar's Vintage Guitars\"\u003e\u003cstrong\u003eVintage \u0026amp; Used Effects Pedals\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cb\u003eShipping Policy\u003c\/b\u003e\u003cbr\u003e\u003c\/strong\u003eBy completing your purchase you are agreeing to this shipping policy. Shipments require signature on delivery, no exceptions. Less than 1% of our shipments are damaged in transit, and we are committed to making sure your item arrives safely. If there is damage, retain all packing materials intact, photograph them immediately, and send the photos to \u003ca href=\"mailto:sales@maharsvintageguitars.com\"\u003esales@maharsvintageguitars.com\u003c\/a\u003e.\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAmplifiers\u003c\/b\u003e: \u003c\/strong\u003eWe take additional precautions to prevent common shipping damage. Depending on the amp, this may include removing tubes, pulling the chassis from the cabinet if heavy transformers present a drop risk, or removing heavy speakers that could crack baffles in transit. Reassembly is required on delivery — we label everything clearly. These measures add to shipping costs but reflect hard-won experience. All amps are tested in our shop upon intake and again before shipping. We cover shipping damage but cannot be responsible for the failure of vintage components in instruments that are 20 to 50-plus years old.\u003c\/p\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":56348666495142,"sku":"AMP-0948","price":9499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0455\/7527\/4662\/files\/marshall-jtm45-mkii-1966-plexi-50-watt-head-serviced-7768583.jpg?v=1779625818","url":"https:\/\/www.maharsvintageguitars.com\/products\/all-original-1966-marshall-jtm45-mkii-plexi-50w-head-serviced-kt66-power-tubes-original-tolex-pots-knobs-very-good-condition-at-maharsvintageguitars-com","provider":"Mahar's Vintage Guitars","version":"1.0","type":"link"}