Dating marshall amps by serial number
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These serial numbers can be decoded as follows:. In August of Marshall switched to their current serial number format which contains more information and is easily decoded. These are printed on a sticker and affixed to the back of the amplifier and are comprised of a letter followed by ten numbers followed by another letter: Checking against other amps from the era as well as component markings speakers, potentiometers, transformers can help to confirm a year of production. You must be logged in to post a comment. Marshall amplifier serial numbers made simple Posted on April 25, April 27, by Phil by Phil.
JTM block logos changed to gold-plated plastic script, these are fragile and many have been replaced.
Cabinet feet are small round and gray. Handles changed to plastic with larger end cap. Power tubes are KT66, 6L6 and Single W Drake transformer, rated at ohms, part number , for W models. Single 50W Drake output transformers rated at 3, ohms, part number , for 50W models. GZ34 rectifier no longer used.
Cabinets have corner-lock joints with a quality control signature inside. Gold Plexigas back panel, changed from cream-colored. Dagnall transformers used in the JTM, changed from Drake.
4 Comments
Chassis construction transitions from aluminum to steel in late First Watt Majors appeared, with treble, bass and volume controls, active tone circuitry and KT88 tubes. The watt Major was modified to match the normal panel layout and the active electronics where dropped. I understand how to with vintage Fenders using EIA codes for pots, tranny,s etc. Is there a similar system for vinatage Marshall components?
These serial numbers can be decoded as follows:. I've seen the same on other vintage Marshalls - this one doesn't have those. No, create an account now. What is he asking if you don't mind me asking. As to the cuts in the tolex on top, this isn't actually damage.
Thanks for any assistance. I really don't know if that is good or not but am trying to educate myself. Sep 21, 5. Looks too clean to me for an amp that old, but I'm generally skeptical about such things. Any shots of the insides you can post? Gnarlly , Sep 21, Sep 21, 6. That chassis is way too clean - No rust or anything - Did the seller state anything about it being rehoused or redone? Sep 21, 7. I'm no vintage Marshall guy by any stretch of the imagination, but I do own a '69 small box 50 watt head. Mine has the lay down transformer I think it's the power transformer that was characteristic of the time, not sure if that was a 50 watt thing only or not.
Mine also has tube retainers for the el34s that look kinda like the asbestos pads we used to use in middle school science class. I've seen the same on other vintage Marshalls - this one doesn't have those. What's that extra hole over on the right?
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It looks like it had an extra pre-amp tube at one point, or was set up to. Notice the lay down transformer on this watter: Those tube retainers aren't the same as mine - in fact they look kinda home made. This is supposedly a '67 watter - note the lay down transformer.
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I'm not sure when they stopped that, but my '69 has it: Ok, this one has a plate covering the extra hole, but note the lay down transformer: I'd post this over at the Plexi Palace forum. The guys there could let you know for sure. Trebor Renkluaf , Sep 21, Sep 21, 8. Sep 21, 9.
Using the serial number to find amp year
Sep 21, There should also be a date on the sticker on the top of the chassis. You can see the sticker in the pic next to the choke. My old Marshall has the year written in pen on the QC sticker The current owner sent pics to Marshall who replied back that the "configuration was consistent with a build". Other Marshall guys think it has a repro rear plexi panel.
The corner of the QA sticker that would have the production date is ripped off. Some "experts" say this happened to many of the just-barely post plexi units so as to trick the next buyer into thinking it was a true plexi As most know the value of a true plexi vs an identical aluminum panel model is significant. This buyer is being VERY open and sharing all he knows.
He states that no mods have been done. My Marshall amp book states that the trannies post are, for the most part, NOT lay down. Anyone know how to date one of these Marshall trannys? Here are some more pictures Sep 22, Space Hammer , Sep 22, Head cab looks repro too, but I am by no means an expert.
Could always be a transplant. How does it sound?