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They were initially broken down into three parts: the model code, the serial production number and the date code.
Marshall used letters as a date code to represent year of production.
Marshall amps had such precedent-setting wattage and tone that their history can hardly be separated from the history of rock itself.
From January 1965 to June 1969, model codes were used but no known serial numbers accompanied them.*) AC/DC version was available, sometimes known as EH-110. **) AC/DC version was available, sometimes known as EH-160 (one sample can be found in Aspen Pittman's book, 3-6C5, 4-26B6, 4-25Z5). ***) AC/DC version, known as EH-195 was also available GA-77 Vanguard: 12AY7, 12AX7, 12AU7, 2-6L6, 5V4 GA-70: 12AX7, 12AY7, 12AU7, 2-6L6, 5V4 GA-55: 2-12AY7, 6SC7, 2-6L6, 5V4 GA-45 Maestro: 2-5879, 6SQ7, 12AX7, 2-6V6, 5Y3 (essentially a GA-40 with bass & treble tone controls and different speaker configuration)GA-40 Les Paul: 2-5879, 12AX7, 6SQ7, 2-6V6, 5Y3 GA-30 Invader: 2-12AX7, 12AU7, 2-6V6, 5Y3 GA-20: 4-12AX7, 2-6V6, 5Y3 (correspond to Epiphone EA-25 Century) GA-20T: 5879, 12AY7, 12AX7, 6SQ7, 2-6V6, 5Y3 (correspond to Epiphone EA-25T Century) GA-15: 12AX7, 6SL7, 2-6V6, 5Y3GA-9: 6SJ7, 2-6V6, 5Y3 GA-8 Gibsonette: 12AX7, 2-6V6, 5Y3 GA-8T Gibsonette/Discoverer: 12AX7, 2-6BM8, 5Y3 GA-6: 12AY7, 6SL7, 2-6V6, 5Y3 GA-6 Lancer: 2-12AX7, 2-6V6, 5Y3 (identical to GA-14 Titan except for 12" speaker) GA-5 Skylark: 12AX7, 6V6, 5Y3GA-400 Super-400: 3-12AX7, 12AY7, 2-6BJ8, 2-6SK7, 6V6, 2-6550, GZ34 GA-200 Rhythm King: 2-12AX7, 12AY7, 2-6BJ8, 2-6SK7, 6V6, 2-6550, GZ34 GA-46T: 3-12AX7, 2-5879, 6SN7, 6V6, 2-6550, 5AR4 GA-85: 2-12AX7, 2-5881, 5V6, 5V4GA-100 Bass: 6EU7, 2-6BD6, 2-6FM8, 2-6L6, GZ34, 0A2 (correspond to Epiphone EA-70 Bass-Amp) GA-86 Ensemble: 2-12AX7, 2-5881, 6V6, GZ34 GA-80 Vari-Tone: 2-12AX7, 2-5879, 2-6L6, GZ34 GA-16T Viscount: 2-12AX7, 2-6V6, 5Y3 GA-14 Titan: 2-12AX7, 2-6V6, 5Y3 (identical to GA-6 Lancer except for 10" speaker, and Epiphone EA-30 Triumph)GA-83S Stereo-Vib: 4-12AX7, 12AU7, 3-6CG7, 4-6BQ5, GZ34 GA-88S Stereo-Twin: 3-12AX7, 4-6BQ5, GZ34 GA-87 Maestro Stereo: 3-12AX7, 4-6BQ5, GZ34 GA-78 & 79: 4-6EU7, 4-6BQ6 GA-79RVT Multi-Purpose: 3-6EU7, 7199, 12AU7, 4-6BQ5 GA-78RV Maestro 30: 3-6EU7, 7199, 12AU7, 4-6BQ5GA-1RT: 12AX7, 6BM8, 5Y3 GA-1RVT: 6EU7, 7199, 6BM8, 5Y3 (Aka Maestro M-1RVT) GA-2RT: 4-6EU7, 12AU7, 2-6V6, 5Y3 GA-77RV Vanguard: 3-6EU7, 1-12AU7, 2-6L6GC, 1-GZ34 (5AR4) GA-30RV Invader: 3-6EU7, 12AU7A, 2-6V6, 5Y3 GA-15RV: 3-6EU7, 12AU7, 2-6V6, 5Y3 GA-19RVT: 3-6EU7, 7199, 2-6V6, 5Y3GA-40T Les Paul: 3-6EU7, 12AU7, 2-7591, 5AR4 GA-60 Hercules: 2-6EU7, 2-7591, 5AR4 (correspond to Epiphone EA-65 Rivoli) GA-18T Explorer: 2-6EU7, 2-6BQ5, 6CA4 GA-8 Discoverer: 6EU7, 6C4, 2-6BQ5, 6CA4 (correspond to Epiphone EA-35 Devon) GA-8T Discoverer: 2-6EU7, 2-6BQ5, 6CA4 (correspond to Epiphone EA-35T Devon) GA-5 Skylark: 6EU7, 6C4, 2-6AQ5, 6X4 (correspond to Epiphone EA-50 Pacemaker) GA-5T Skylark: 2-6EU7, 2-6AQ5, 6X4 (correspond to Epiphone EA-50T Pacemaker) Courtesy of Allan Fredrickson.GA-77RVT Vanguard: 4-6EU7, 12AU7, 7199, 2-6L6 GA-30RVT Invader: 4-6EU7, 12AU7, 2-7591, 5AR4 (most likely corresponding to Epiphone EA-12RVT Futura) GA-30RVT Invader: 4-6EU7, 2-12AU7, 2-7591, 0A2 GA-19RVT Falcon: 3-6EU7, 6C4, 2-6V6, 5Y3 (both brown and late black models correspond to Maestro M-216RVT and Epiphone EA-28RVT Pathfinder) Courtesy of Matt Lafferty and Jonathan Horne.Production has continued there uninterrupted through today, though some lower-priced models are now made in China, India or Korea, depending on the series.JTM-45 Models: 1962 - 1966 Bluesbreaker Combos: 1964 - 1972 Four-Digit Models (no series): 1965 - 1981 JCM 600 Series: 1997 - 1999 JCM 800 Series: 1981 - 1991 JCM 900 Series: 1990 - 19 Series: 1998 - 2008 Silver Jubilee Series: 1987 - 1989 30th Anniversary Series: 1992 - 1999 JTM Series: 1995 - 1998 35th Anniversary Series: 1997 only Solid State 5000 Series: 1984 - 1991 Valvestate Series: 1991 - 2000 AVT Series: 2000 - 2007 Mode Four Series: 2003 - 2008 MB Series: 2006 - 2012 Hand-Wired Reissue Series: 2004 - present JVM Series: 2007 - present Vintage Modern Series: 2007 - present Haze Series: 2009 - present MA Series: 2009 - present MG Series: 1999 - present JDM:1 Series: 2010 - present Some amps won't fit into these series (like the recent Class 5 Combo or various signature and limited edition models), so using the serial number will be your best bet to hone in on a specific date of manufacture.