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Fender Tube amp codes: - look for a 2 letter code stamped on the tube chart inside the back of the amp - the first letter is the year, and the second letter is the month. An amp stamped NA would have been made in Jan. Here is a list of the first letter showing the year of manufacture. These codes have nothing to do with the serial number that is stamped on the right rear of the chassis - Those numbers are posted below. These codes are for amps with the serial number beginning with a letter:. EIA numbers taken from the transformers may help you to determine the date of production on amps that fall between the different dating schemes.

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This code can be found on the power transformer, output transformer, choke, and reverb transformer. They are all usually within a few months of each other.

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Use the latest one to give you a good idea of when it was made. For example, if your silverface super reverb has transformer codes all fromit was made in ! Many silverface and some blackface amps have the exact week, month and year stamped insie the chassis.

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Cart 0. The faint ink can sometimes make them difficult to read.

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Occasionally they might be printed on the outer rim. Date codes are printed vertically on the frame. An additional inspection letter is usually included except Aug 73 to Jun 74these can be ignored for dating purposes.

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From about mid to the T model number is rarely stamped on the frame leg because it is shown on the speaker label. These inspection numbers can be ignored for dating purposes. From around Dec to April - the date code, speaker model, and inspection number are joined together in one continuous line.

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Due to the black coloured frame, the date stamp is printed on the magnet instead of the chassis leg. Date codes are printed on the front gasket and may include the model number and inspection number.

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Does the code N 9BK make any sense? My amp guru says they must have transposed the B and the K at the factory but that seems a bit farfetched. It has the cone code of 23 and is a T with no magnet cover. Two of the speakers in the cabinet have this date code. The other two are JB.

Speaker Codes And What They Mean. The picture is a section of the basket rim of a speaker. The 6 digit code indicates what manufacturer made the speaker and when it was made. It is called the 'Manufacture Date Code'. Here is a list of some of the speaker manufacturers and their EIA codes. TRANSFORMER DATE CODES: Another way to get a close estimate of when your amp was made is to read the codes on the transformers. Most post tweed Fenders had trannys manufactured by Schumacher. They used a code like this: - The date is in the last three digits, after the -. More Speaker Manufacturer Codes. General Electric Quincy Atlas Harman Kardon Radio Speaker Automatic Manufacturing Heath Raytheon 24 Becker Heppner RCA Bendix Hitachi ROLA Best Jensen JW Davis Ross Bogen Magnavox Russell Carbonneau Matsushita Solar.

Celestion printed them back to front sometimes by mistake. The BK should be KB. The 9BK date stamp does seem to turn up quite a lot, there is another one shown here:. Hey there, thanks for such a fantastic and informative site!

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It is a T G12H. The first thing that is unusual is it happens to have the exact same date GB17Y of the one above that you have on your site showing what the date code means!

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Have you ever seen this situation where a T has a cone? Another strange thing is the original pre-Rola solder tabs are gone although this may have just been a repair that somebody put more modern tabs on it.

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Best, Ed. Hi Ed, good to hear from you. Yes it is definitely unusual to find a speaker with the wrong cone fitted like that.

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It is unusual, but does seem some left the factory with the wrong cones. Repairing them is difficult when they have broken off.

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There are some good and bad amateur repairs out there! I got 4x greenbacks g12m25 with basscones, and the seller told me they were made So it seems its backwards? Hi Nikolaj, thanks, yes that sounds like a stamp to me, and correct cone code for the period.

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. In a BF Vibrolux Reverbs you could have either Jensen, CTS or Oxford, the BF Super Reverbs had Jensen, CTS, Oxford or. Apr 04,   The codes are added on the production line and are stamped on the speaker's chassis leg, on the front gasket or for later speakers, printed onto an id label stuck onto the magnet's edge. If you can track down the datecode, simply refer to the following set of tables, which provide an accurate record of the date codes used throughout the years. Serial Number, Date - Dating, Speaker code & Tube Information by; Chuck Kotlaris This data base is for use for dating and verifying your amp. This information is not for commercial use, and cannot be copied, posted, pasted or otherwise used in any publication or web site.

It is fairly common to find them printed back to front in late This page explains further. Those should be very nice sounding speakers too!

Date Code Information. There is an easy way to determine the date of your vintage Jensen speaker. On the edge of the speaker where the mounting holes are there will be a six digit number. The first three numbers will be which denotes the manufacturer as Jensen. The next number is the year of manufacture and the last two numbers will be the. Aug 24,   Step 1 - Check The Stamp Location (12? speakers only) The location of the date code tells us the most likely date range the speaker was made: On a magnet sticker = early to present. Note - if the date code is printed directly onto the magnet without a sticker, it is likely a chassis leg period stamp on a black speaker. Mar 02,   Found as second stamping on speakers as a date code XXX from through the 50's and 60's (all the 's amps are generally field coil Rola spkrs). Manufacturer Source Codes. Below are many manufacturer source codes (which are the first 2,3, or 4 digits of the source-date code).

Hi Lachlan, good question! So we both learned something! Your email address will not be published.

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Website URL. Celestion date codes are located on the front gasket, the chassis, or a magnet sticker.

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To date your speaker, simply find the pair of letters within the date code - these represent the month and year of manufacture: Then use the reference table below to decipher them. If you need more help, scroll further down the page for a more detailed explanation. That is incorrect, as is evident here.

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You may also enjoy:. The History Of Celestion.

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