Jensen Speaker Date Codes

The Celestion register of speaker types – the “T” book – is printed in extenso insofar as it relates to 12″ speakers by Michael Doyle, “The History of Marshall” , appendix 1, pp. Info has also been usefully assembled on the Bygone Tones site. There seem to be three basic types 1 small nuts on the cap, date code stamped on frame; 2 small nuts on cap, date code on gasket; 3 large screws on cap, date code on gasket. See the excellent comments on this Plexi Palace thread. The Rola G12 B – the 15 ohm version of the B above. The speaker below it on that page with code 04LL on gasket, but small screws on cap, is probably from November The Celestion 74 – 15 Watts – 15ohms An uncommon type of Celestion alnico. The lightweight version of this driver was the Celestion

Celestion Date Codes

Return to the Main Index. Sometimes there just isn’t enough information on electric instruments and amps to allow them to be properely dated. And many people ask me to try and determine the year of their old amplifier, or to help them with the year of their older off-brand electric guitar.

Dating speakers codes 7, a collection of the office of your event: jennifer pahlka jennifer is that reveals the front gasket, radios. Request a daunting task for

This list is circa , and some codes have been reassigned or added since that time. Code formats were not completely standardized, but a little deciphering will generally yield the info of interest. Note that many makers also stamped OEM Original Eqipment Manufacturer part numbers above or below the EIA code, in some cases parts makers or the customer elected not to include the EIA codes, so not all parts have them.

They generally follow the following format: One alternate scheme is: Usually single digit date codes are from the ‘s, but have on occasion shown up in later decades, even up to the ‘s. If one has a general idea of the age of the piece in question, usually the decade can be divined from that. Another alternate is in the format following: And another is like this: KE The reason was purportedly to allow factories to track the dates of manufacture of defective tubes especially important in the case of OEM customers that might send back entire batches of tubes , but avoid possible consumer complaints about “stale” tubes.

This sounds perhaps a little silly since the shelf life of tubes is decades, at least indefinite in practical terms , but some OEM’s might have beenn a bit irritated by occasional consumer complaints such as “my model TV has model tubes in it!

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PayPal How old is my Hammond? This is one of the most commonly asked questions, and unfortunately, due to the lack of available factory records on production dates, one of the most difficult to answer. There is some help available however:

In this case, “” is the Jensen manufacture code. “07” represents the year (), and “46” indicates that it was made in the 46th week of the year. Unfortunately on some older Jensen speakers, the year is only represented by a single digit (just “7” for example).

October 04, , There is presently a great deal of inconsistency across the collector community in doing this. Up until very recently I was quite content to date my consoles to the model year that they appeared in the Magnavox catalog. For instance my Provincial Cherry Concert Grand was introduced to the public in October The two brochures that introduced this model are available on this site.

I have thought of this console as a CG. If you look at the date codes on the components in my console they range from mid to early My console was obviously delivered to it’s first owner sometime in I was in a discussion that some of our members here may be aware of on ARF where a member contended that consoles were like cars, models were introduced in Fall of the previous year. It’s an interesting and compelling argument because it’s so normal with cars. Yet, I’ve never found any Magnavox literature that refers to their consoles as being made in a “model year”.

I would like to propose to this group that we debate the issue and reach a consensus on dating these consoles so that we can properly organize our information.

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What happened to II? There are some technical changes as well; the III uses varactor tuning compared to the II, which uses a conventional variable capacitor. Dave Markson has this to say about the II vs. As for MW, here are my findings:

code that reveals the manufacturer as Jensen and the production date as the 38th week of Speaker companies, along with other electrical manufacturers, were assigned EIA (Electronics Industry Alliance) codes which were used to identify their equipment. The *** portion of the rim code is the number assigned to Jensen.

Firstly, take note of the location of your date stamp – is it on the frame, on the gasket, or on a sticker? I have colour coded this information on the chart for reference. These stamp formats are also shown at the top of the chart for reference. However please be aware that not all Celestion speakers conform to them. If you are still struggling to date your speakers, I have included some example photos and extra pointers lower down the page that you can use for comparison.

If you are trying to date an old greenback speaker my blog post How To Date Vintage Greenback Speakers might also be helpful. See my article Celestion Speaker Models and my T number reference list for more info. The small circular stamp or “insp” text is a quality control stamp. This is an important stamp to look for on pre-rola speakers. Crooked vintage amp dealers would clean the original date stamps off and then print their own.

These are usually greenback speakers supposedly dated between to They are fairly easy to spot once you know what to look for. A fake pre-rola date stamp Example Date Codes Through The Years to Date stamps are usually printed on the outer rim of the speaker and consist of 4 digits only.


You may compare these with your own speakers to determine what you have. Speakers are like ice cream; we all have our favorite taste. Some like strawberry while others like chocolate. What someone finds harsh can be beautiful sparkle to others. Speakers can have different frequency response depending on materials and construction design, like cone shape, magnet weight and coil size.

This page is a collection of odds and ends information relating to speakers and speaker implementation. You might find some of the information useful in determining which speaker would be best suited to your application. Speaker Codes And What They Mean. The picture is a section of the basket rim of a speaker.

Last updated December 14, Note: The numbers below are for Hylight and Biacrown Hiwatt amplifiers only! Any serial number that begins with one or more letters was made in the 90s or later, and is not included in this list. Please note also that the speaker cabinet serial numbers used a different progression. Please browse the Registry page for more specific data relating serial numbers to dates. I have not yet managed to collect enough information on the later models carrying the Hiwatt brand and manufactured by Turntone or Sterling, e.

The serial numbers of these newer models often fall within the ranges listed below, but these were manufactured in the mid s and later. Turntone started the “L” series of amps in or so, and these have no manufacturers brand on the serial plate, but say “Made in England. All units manufactured by Hylight Electronics from to had a serial number plate like the ones in the pictures below attached to the metal chassis of the amplifier.


There is no reliable way to date amps other than to ask Fender customer support to look up the date from the serial number, although you may find a date code on the speaker. Early Tweeds The early green board tweed-covered amps were not lacquered. Once again, only the speaker is different. It is not old stock. It has the same cream board inside with the same components as every other current-production Blues Junior.

Since , all Celestion chassis drivers have been stamped with a date code (2 numbers and 2 letters), denoting the exact date of manufacture. The codes are added on the production line and are placed on the speaker’s housing leg or the magnet edge.

Anyone got an intuitive chart for Oxford speakers that went into fender cabs circa s. I have run into an anomaly, fender was screwy in the. I’ve got a Princeton, and it’s got a CTS speaker in it. Those numbers don’t look familiar but the frame looks like it’s a Utah or Oxford. I think many of us know about the jensen codes, but there is much less out there on the oxford codes. Its well-known that the code indicates.

This data base is for use for dating and verifying your amp

Pioneer Serial Number Date Codes

The purpose of this guide is to help you recognize a good Fender amp by reading about it and looking at pictures. It will allow you to make safer purchases on a global market without having to physically play an amp before acquiring one. There are many facts to consider when determining the condition and originality of a vintage amp. While the collectors are primarily interested in originality, the musicians see the amp as an instrument.

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).

Yes, you can use the power transformer as another option for dating your Music Man Amp if the original Eminence speaker has been replaced. You also don’t have to remove or get into the chassis to find the transformer, and as mentioned earlier with speakers, this needs to be the original transformer and not a replacement.

There should be a code stamped into the metal case on the transformer that looks something like this: Apparently Music Man used the same source for it’s power transformers as did Fender back in the 70’s, because my MM also has the source code. Now, we come to the last three digits of the code with the 8 being the last digit of the year, and in the case of Music Man Amps this would have to be , as the amps were only built from thru Finally, the last two digits of the code 13 would stand for the 13th week of the year.

If your amp is all original, you might find that the dates on the speaker and transformer can vary by several months, so I would probably be inclined to use the later date when trying to date the amplifier since the later dated parts were probably installed last in the manufacturing process.

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That amp worked pretty well with my Rick string. That amp turned out to be an early-production Pro-Amp. I started to investigate the world of pre-CBS Fender amplifiers. During that era Fender blackface amps, covered in black tolex with silver grilles, were everywhere.

How can I tell how old my speaker is? We attach a small label to either the side of the magnet or on the inside arm of the basket with our spec number and manufacturing/date code on it. The spec number will begin with the size of the speaker (i.e. for a 10″ it would be ).

Step 2 — Decipher The Date Code All Celestion date codes contain a pair of letters representing the month and year the speaker was made. In most cases the first letter represents the month, and the second letter represents the year. To date your speaker, simply find the pair of letters in your date code and use the chart at the top of the page to decipher them. Use the stamp location colour codes to guide you. Be careful of date stamps printed in reverse year then month.

A number directly next to the pair of letters, if present, is the day of the month. More example date stamps are shown further down the page. What About The Stamp Format? You might have read on older websites to use the stamp format to date your speakers. Although the stamp formats can be useful for verification, I do not recommend using them as the main basis for dating your speakers.

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Speaker company EIA codes There are several ways of identifying a manufacturer, or particular part number of a component in most audio gear that’s been manufactured since the mid s. There’s an EIA Electronic Industries Association code that identifies the manufacturer, or company, sometimes stamped either in ink, or metal embossing, or ID tag on the particular component – in this case the speaker. Sometimes there is also another series of numbers stamped on the piece, this is the OEM Original Equipment Manufacturer part numbers above or below the EIA code, and in some cases parts makers elected not to include the EIA codes, so not all parts have them.

These “Code” formats were not completely standardized, but a little deciphering will generally yield the info that’s needed to identify the speaker in question. For example if you have on a speaker, you can tell that it’s a Jensen speaker, but the year is either , , or from the ‘3’, and the ’25’ is the week of production. The model type, or number, is sometimes stamped on the speaker frame as well; for example P10R, or C10Q.

To date your speaker, simply find the pair of letters in your date code and use the chart at the top of the page to decipher them. Use the stamp location colour codes to guide you. Note: Be careful of date stamps printed in reverse (year then month).

A recent remark by message board poster indicating that many speakers sold under the Trusonic label were actually made by Utah got me to digging for evidence in support of this claim. In the process, I not only found evidence to support this contention, but I also came up with a family tree of sorts for Utah and Trusonic speakers circa Utah was primarily a raw driver manufacturer with a single plant located in Huntington Indiana.

It flourished in the s and 70s, as it undoubtedly made drivers for a large share of the one-piece console stereos that were proving increasingly popular by the mass market during the 60s and the 70s. In addition, I believe that they were a major supplier of drivers for many Allied house brand Knight speakers in the s.

In my Allied Radio catalog, they were selling complete Utah speaker systems as well as two and three-way single raw drivers right along those labeled as Knight. I suspect Utah also supplied Allied and later Radio Shack with raw replacement drivers for low-fi and mid-fi applications during the period as well as drivers for many Radio Shack systems. Utah loved Alnico magnets and used them even in inexpensive replacement speakers, and perhaps the declining availability of cobalt was also a factor.

Ever since I was a little child I was fascinated with the idea that a magnet attached to a piece of paper could produce sound. To further complicate matters there seemed to be little ordering to their numbering systems for the various models. As a starting point, lets begin with their basic model. This speaker was always in a 14 x 23 x 10 inch box, in oiled walnut veneer. At the time I considered that to be quite a deal given the size of the speaker and drivers and the cabinet work.

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