Dating vintage jensen speakers
You may compare these with your own speakers to determine what you have.Dating Fender Tube Amps by Serial Number, Part I by Greg Gagliano Copyright 1997, 20th Century Guitar Magazine. Well, we'll get to good parts, but first a little background information is in order.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.GA-19RVT Falcon: 3-6EU7, 7199, 2-6V6, 5Y3GA-77RET/RETL Vanguard: 3-6EU7, 2-12AU7, 6CG7 (6FQ7), 2-6L6, 0A2 GA-75 Recording: 2-6EU7, 6CG7 (6FQ7), 6C4, 2-6L6 GA-25RVT Hawk (Dated Oct '63 - only one tone-control): 4-6EU7, 12AU7, 2-6V6, 5Y3 GA-25RVT Hawk: 2-6EU7, 3-12AU7 (5814), 2-7591 GA-17RVT Scout: 2-6EU7, 12AX7, 2-6AQ5, 6CA4 (correspond to Epiphone EA-33RVT Galaxie)Titan: 3-6EU7, 2-12AU7, 6FQ7, 4-6L6, 0A2 (12AU7 splitter, 6FQ7 driver) Mercury: 6EU7 splitter, 6FQ7 driver and 2-6L6 output Titan I, III, V and Medalist: 3-6EU7, 2-12AU7, 6FQ7, 4-6L6, 0A2 (correspond to Epiphone EA-500T) Mercury I, II and Medalist (sloping sides): 2-6EU7, 6C4 and 1/2-6EU7 tremolo, 1/2-6EU7 splitter, 6FQ7 driver and 2-6L6 output, 0A2 Courtesy of James Black.In a BF Vibrolux Reverbs you could have either Jensen, CTS or Oxford, the BF Super Reverbs had Jensen, CTS, Oxford or sometimes JBL, the BF Pro Reverb had Jensen, Oxford or Utah, .In the silverface era Eminence, Oxford, Utah and Rola were more often used and Jensen was phased out.Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.
*) 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.This tells us that this is an Oxford speaker (465 is the number for Oxford, 137 is CTS, 220 is Jensen and 328 is Utah).The forth digit is 9, which tells us it was made in 1959 and 09 tells us that it was the ninth week of the year.Our Buyer’s guide to vintage Fender amps explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc.Lots of different speakers were used in the blackface and silverface era Fender amps.
Devin runs Doc's Music in Springfield, Missouri and his interest lies in the woodie and tweed Fender amps made from 1946 through 1960.