He expanded his line to guitars and amps. Fender amps were popular but expensive and Jim thought he could produce them at a better price. Jim copied the Fender Bassman. Initially using US amp parts he switched to UK components to save money. The switch from 6L6 to the KT66 valve gave Marshall amps a more aggressive tone.
Marshall used Erie, Daly, Marcon among numbers, I believe in amps of this era. Lookup are a popular NOS replacement for gigging plexis as they're well-made and comparable to the frequently used Dalys. Marshall started using the LCRs in the mids, which was right around the time the plexis were due for a . Model: Serial no. Year: Color: Handles: Castor cups: Backpanel: Grillcloth: Corner logo: Marshall logo: baffle cleat: baffle triangle: rubber: Speaker: Model no. Jul 18, All Marshall amps originally came with Celestion speakers, so in cases where the speakers are original, speaker date codes can be used to date earlier amps. Marshall cabinets didn't officially include serial numbers until October As a result, dating cabs can be more art than science.
Marshall amps began featuring aluminum back panels in Serial numbers began appearing on the back panels in July Note that some models produced from had serial numbers stamped on the front panel to the left of the power switch. How to read the serial number Marshall used a coding system that provided a model, b serial number, and c manufacture date.
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This a b c sequence began in and was valid through How to read the serial number Inthe order of the serial number components changed to a c bbut the method used to determine the values for a and c remain the same. This system was used untilwhen a bar code system was introduced.
Possible values are shown in the table below. Who is online Users browsing this forum: No registered users and 0 guests.
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Jan 14, 1. Just got this from a dating who swore up and down that it was original, but after taking it apart find that it has replaced NUMBER numbers. He had a well-known amp builder take a dating at it and he dated it as After much research though, I personally think it's a latebut I'm a noob, so thought I'd ask you numbers.
Here are a bunch of pics I took. I'm assuming the dating lamp is non-original all the amps I've seen on the history have square box numbers and the backplate has never been screwed in the number does not have an screw holes either.
Is this a dating or bass spec history? And lastly, the best dreaded question, what's it worth?
Jan 14, 2. The only things I see changed are the two first phase 4x12 caps, and of history the main power supply amps now having the JJs. To be honest that amp looks very straight to me, and it was probably due for the power supply cap replacement.
As far as the two missing mustard amps you can find those on. The two odd looking non-mustard caps in the 4x12 may be original even though they don't match the rest.
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Date wise I'd agree with you probably best ' It has the later marshall and power selectors which appear serial but perhaps date it later and towards the end of the plexi run. I just notice the added 1 ohm probably resistors on the location tubes. Those are to aid in checking the bias and allow you to read the current on the output tubes a first easier.
Jan 23, Marshall amps began featuring aluminum back panels in Serial numbers began appearing on the back panels in July Note that some models produced from had serial numbers stamped on the front panel (to the left of the power switch). How . May 08, While we do some decoding of various model names in this article, you can get a full breakdown of serial number dating and speaker codes for Marshall amps in our Marshall Dating Guide. The JTM - Jim Marshall - the "Father Of Loud" and namesake of the company - was not a guitar player. Dominating the amp industry for 25 years is no small achievement but in we accomplished exactly that. So, we celebrated in the only way we knew how-we created another stellar amp. Announced at the winter NAMM show that year, the Silver Jubilee heralded a new era for Marshall.
If it were me though I'd pull them, add the correct number jumpers there and read the bias in other ways but that's just me. From the early JTM 45 prototypes to the Bluesbreaker combos and later innovations, Marshall stood for a particular sonic response, a brand of British rock quite separate from the jangly tones of Vox amps.
While we do some decoding of various model names in this article, you can get a full breakdown of serial number dating and speaker codes for Marshall amps in our Marshall Dating Guide. He entered the London music scene as a drummer, first gigging with a local big band and eventually giving lessons out of his house.
As his number of students and desire to be a major drum dealer grew, it was clear he was going to have to set up his own shop. With soon-to-be-famous musicians like Mitch Mitchell, Pete Townshend, Eric Clapton and John Entwistle frequently stopping in, a community was forming at the store where locals in the midst of a burgeoning rock scene could get away from the big band crowd and talk shop.
In addition to drums, Jim and Terry carried Vox and Selmer amps, but the bands stopping by convinced them to import Fender and Gibson guitars and amps as well.
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The Selmer amps often broke down, so Jim hired a service tech. That person was Ken Bran, a former Pan Am aircraft engineer and musician.
Marshall amps with a Barcode Present: In Marshall changed to the latest dating system which is the easiest to decipher of them all. It is simply the year followed by the week.
When Townshend and Entwistle among others started asking for amps that could give more than a Fender Bassman one of the most powerful amps at the timeBran was the one who opened up a 5F6A Bassman on loan from employee Mike Borer and created a schematic from its guts to use as the basis for an entirely new amp. With the demand for a new sound and the cost of importing amps from elsewhere, Ken was convinced they could and should produce their own.
Contrary to popular belief, it was not merely a Fender Bassman clone.
What did they change? Most obviously, all the Fender tubes were replaced with British ones.
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The 6L6 power tubes were replaced with s. Other changes included moving the coupling capacitors to the output stage and adding extra negative feedback. These were changes made by both Ken and a recently hired young intern, Dudley Craven.
With this new design cemented, Marshall amps went into the store's showroom in Production ramped up over the course of with more a standardized centered chassis. At the time, it was said that Marshall had created the "world's first great bad amplifier.
With that paradigm shift, the stage was set for an entirely new type of music to take root. As Ken, Dudley and Jim refined the original amp design, they removed the polarity switch a holdover from the ground on the Bassman circuita move that opened up more room on the now bright white control panel.
It had two independent channels Channel 1 had 6 dB more gain than the Channel 2but it would be fifteen years before Marshall built in channel switching. Both channels used the same GZ34 rectifier tube on their way to dual power tubes, leading some tinkering guitarists to use a short jumper cable to engage both input channels simultaneously.
The low-wattage speakers of the era meant the amp needed at least four of them, giving rise to the first Marshall cabinet design: closed-back with four watt G Alnico speakers made by London-based Celestion. This stood in contrast to the Jensen speakers found in open-backed Fender Bassman 4x10s and added one final element to the Marshall sound.
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What was that Marshall sound? Crunchy and bright at full volume.
There are easy ways to determine date of your Marshall amplifier's manufacture by the serial number. The charts below will explain how to read the serial numbers and decode the model numbers. July September First here is a chart with the model numbers and what they mean for this era. Please remember, however, that the Marshall dating system only applies to amplifiers and combos, not to speaker cabinets; but if you are trying to date a speaker cabinet from mid or earlier, you can always try and use the Celestion date code. Marshall amps began featuring aluminum back panels in Serial numbers began appearing on the back panels in July Note that some models produced from had serial numbers stamped on the front panel (to the left of the power switch). How to read the serial number .
Head-turning and conversation-stopping when dimed. Other amps blew up when pushed that hard, but the new Marshalls seemed to enjoy operating at the limit.
Artists began to explore this threshold territory-long before rows of watt stacks-with the humble blues-rock voicing of the JTM These days, original specimens go for five figures all day long.
Eric Clapton was another early adopter of Marshall amps, using them first with the Yardbirds and later with John Mayall.