A: This is a tough one, and short of various inspection stickers, and reliable transformer codes and pot codes, there is currently no definitively reliable way to determine an accurate date based on serial numbers alone, with the possible exceptions of the DMI-era products and beyond. The serial numbers during this era appeared as or , as just two examples. Here’s an example of a speaker cab’s ID plate. The two-digit prefix in these serial numbers seems to indicate the year made, and in the latter example, which was seen on a DMI-Sound City F bass cabinet, it appears the model number might have been included in the serial number as well. For the earlier Dallas Arbiter-era Sound City products, however, the best you can legitimately determine is a range of years during which an amp or cabinet was made based on the eras in which these products appeared. See also “Q3” below.
Speaker Codes & Applications
The first three digits indicate the jbl for the speakers. The date indicates Altec Lansing and represents Harman Kardon. Look at the remaining digits. The first two horn after the manufacturer three digit code indicate the year. Speakers made for the s only have one digit representing the year which is misleading.
I have a set of 12″ speaker that look to be alnico CTS from the 60’s, but need a Join Date: Dec ; Location: Sunny California; Posts: 1,
I pulled this information from Google’s cache of the site. If anyone feels this page should be taken down, please feel free to contact me. Ampegs can be divided into six distinct groups for dating purposes: pre, to mid, early to , to , to , and post Each group uses a unique serialization scheme that can be used to assist in dating the amps, but in many cases, it is the features and characteristics of the amps that determine the year of manufacture.
Electronic Industries Association EIA codes can also be very useful for giving clues as to an amp’s age. These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic “can” caps. Of course, these codes are only applicable to original components, not replacement parts. Shortly after World War II, American electronic component manufacturers began to stamp a semi-standardized code into the parts they produced.
The code contained information regarding the manufacture and date of production. These codes have been used on components including potentiometers pots , transformers, capacitors, tubes, and speakers. The code usually consists of 6 or 7 digits such as where the first two or three digits is the EIA code for the manufacturer denotes CTS , the fourth digit and sometimes fifth digit denotes the year in this case it could be , 66, or 76 , and the last two digits denote the week of the year.
It is important to note that parts do not always contain EIA codes, especially those parts from the late s and early s. The Ampegs made between and did not have serial numbers and must be dated in the same way as the Michael-Hull models, specifically, by finding the EIA date codes on pots, transformers, multi-section “can” capacitors, and speakers.
1969 AMPEG SVT
However we’ve seen early year SVT’s without any hand numbering. Both versions have been seen throughout In Ampeg manufactured three different types of removable back panels for the SVT.
Jenson speakers are from the s, and CTS and Centralab speakers were used from the s onward. This is good to know if you have a.
I know, I know. For those readers who may have joined us recently, I am doing some Fender amp research along with Devin Riebe and Greg Huntington. Our research efforts are now in their fourth year will it ever end? Again, I would like to thank everyone who responded to our request for data as outlined in Parts 1 and 2. Early silver face amps: Part 2 went into this topic in some detail, but since that article was printed, I have been asked a lot of questions about this subject.
Part of the confusion stems from the lack of any AB or AC tube charts. Fender never printed any since there were plenty of leftover AB tube charts available and these were used well into Although the cosmetics changed, the circuits remained unaltered from the blackface circuits on the earliest silverface amps. The date of the change from the blackface circuit to the CBS silverface circuit was dependent on the model, but most of the amps that were modified received the circuit change by mid-year of The cosmetics of the silverface amps during the transition between circuits was also in transition making it difficult to determine circuit type on cosmetics alone.
The amps during this period could have the earliest style silverface grill cloth or the more familiar silverface grill cloth. All of the amps would have the aluminum grill trim and they may or may not have the thin black vertical lines on the control panel. One clue that can be used is the ink stamped chassis date code that is usually located in the chassis, but is sometimes found on the underside of the chassis behind the tubes.
These read something like T or F where the “66” and “67” denote the year and the “03” and “42” denote week of the year.
CTS Speaker ID help
The Twin was introduced in , two years before Fender began selling Stratocaster electric guitars. The amps are known for their characteristically clean tone. The Twin has seen a number of revisions since its introduction, both internal and external, with its designs sometimes varying greatly from one year to the next.
I’ve aquired, (for the price of $15) a working CTS speaker, having trouble finding info. According to date code, these were made in ‘
The Code on the tube chart of your Fender Amp is made up of two letters. The First letter equates to the Year and the Second letter to the Month. Reissue amps also use stamped Date Codes. Examples of “Hand Stamped” Date Codes. The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it’s ink-stamped or paint-stamped on the “bell housing” of the speaker.
In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code. The remaining 3 or 4 digits are the date code. In 3 digit dates code, the 1st digit is the last digit of the year. On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year.
In either case, the remaining 2 digits are the week of manufacture 01 to
Identifying old CTS speaker
There has always been a considerable interest in the serial codes, options and the history of the true original Heritage series Klipschorn, LaScala, Belle, Cornwall and Heresy. The original “Codex” was published on the Forum several years ago, but times have changed, and with the Klipsch transition to the new forum, it appears that the document is either “lost”, or deleted, etc.
To that end, and as a reference source again
EIA (Electronics Industry Association) Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are.
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How to Date a Gibson Amplifier
May 18, 1. May 22, austin,tx. It’s an 8ohm, 15″ square magnet with the following numbers.
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.
This page contains details about the Magnatone Custom Series amps. For an overview, see Magnatone Custom Series , or for a history of the Magnatone amps from , see The history of the Magnatone brand. Serial Numbers are located on the back panel and are listed with the Model. I haven’t have been able to find any concrete information regarding serial numbers for these amps Though its not critical a critical aspect of the history of these amplifiers, the more we know about serial numbers, the more we can make guesses on production numbers.
Early Custom’s were build without the interlock switches, although the interlock was on the schematic inside the amp. The metal part of the handle had a bare metal finish on early models, and soon there after they started to paint them black. Also, the badge plates were different on the very early Customs, eventually they were produced with the large “M” below right. It is possible that the first models had yet a different plate than the style of the early M7 plate below. This rather cheesey acrylic badge was used on some Customs.
The Date of your Wurlitzer Electric Piano
He makes house calls. Model Serial Please note that this number is NOT a date stamp. Every instrument has a distinct number.
The task for the SRE19 CTS Challenge is speaker detection: given a Date. Evaluation plan published. July 15, Registration period.
Order by:. Available to:. These are from my Bassman Ten. I replaced them with Jensen Mod10s and have come to regret it. But I’ve now handed the amp to my kid and the speakers deserve a loving home. Full disclosure: Two speakers are great. Esp for being nearly forty years old. I mean, they sound fantastic. Yes, these aren’t the fabled U-magnet, but they sound beautiful. One speaker sounds a little weaker than the others.
But the cone looks fine. One speaker has a tear in the cone at the edge.
1963-1966 Magnatone Custom Series Dating
Possible culprits include the preamp tubes, the power tubes, the hum balance resistors, and the power supply caps. Thanks for your input. I have a Deluxe Reverb and am trying to figure out if it has a Utah or some other kind of speaker. Any speaker ideas on that front? I also have one of the newer Fender Pro Reverb amps with an effects loop and a silverface Twin Reverb with a volume control.
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.
Since I primarily collect amps by Fender, and guitars by Gibson, Fender, Martin, National, Epiphone, Gretsch and Rickenbacker, I really can’t help them with these other less popular brands. As you have probably noticed, there is plenty of information here to help date the brands that I am interested in. But where does that leave everyone else?
Well I’m not one to leave you out in the informational cold, so here’s something that I use quite often in dating amplifiers and electric guitars. It’s called the “source-date code”, and it can help determine the approximate age of an electric instrument by the date its components were manufactured. Source-Date Codes On American made vintage gear, the pots and speakers provide an excellent opportunity to date a piece of equipment by referencing their “source-date code”.
The source-date code found on pots and speakers gives the manufacturer and date roughly when the components were made. It may have been some time before the part was installed at the factory, but it still provides a good approximation of when the gear was made. The source-date code will signify the earliest possible date that the instrument or amp could have been made.
This isn’t going to be exact, but it will give you a “ball-park” age.