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Jan 5, 1. May 3, Orangevale, CA If anybody is interested, I dug out the Ampeg serial number dating code for Ampeg and Crate gear manufactured during the Saint Louis Music years. Jun 16, 2. Does anybody have anything new to add to this old thread?

May 3, Orangevale, CA If anybody is interested, I dug out the Ampeg serial number dating code for Ampeg and Crate gear manufactured during the Saint Louis Music years. Jun 16, 2.

Sep 16,   Dating Ampeg Amplifiers 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. Oct 06,   The Jet has limited room so large alnicos like the celestion blue and P12N are out. Smaller alnico's without the bell covers do fit i.e. p12r p12q and their Weber equivalents 12a and 12a If you want the most flexibility with higher power ratings while still fitting in the Jet's cabinet then ceramic is the way to go. May 17,   I've got an old Ampeg "J" Jet I can't positively ID. Researching the forums, there's one thing that seems different about this one: The models that I see discussed with power tubes seem to always have 2 of them, but mine has three. (The other two tubes are .

Does anybody have anything new to add to this old thread? Jerrold Tiers or?

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Jun 16, 3. Dec 20, Phoenix.

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The book contains, in addition to an in-depth history of the Ampeg company, more useful technical information on the variations in Ampeg amplifiers, including color depictions of the various cabinet coverings and grill cloths. Click here for information on ordering this book directly from the authors. Dating Ampeg Amplifiers Ampegs can be divided into six distinct groups for dating purposes: pre, to mid, early tototoand 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.

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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. Therefore, do not poke around in your old Ampeg if you are unfamiliar with amplifier electronics or their operation.

A brief summary of the EIA system follows.

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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 potstransformers, capacitors, tubes, and speakers.

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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 CTSthe fourth digit and sometimes fifth digit denotes the year in this case it could be66, or 76and 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. These amps used a serial number system that was not used by any Ampegs.

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Unfortunately, the serial numbers are of little help for dating one of these pre-Ampeg models and EIA date codes on components were used sporadically during the early post WW-II years. The only date codes that seems to be readily available is found on the speaker magnet located under the bell cover. 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.

The Nth unit, however, may not have started with Ampeg may very well have used or as the starting point during slow production periods.

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Nevertheless, for dating purposes, the serial number provides adequate information during this period. For example, a Duette with serial number was made in 7during October 10and was possibly the st amp made that month.

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A Super Echo Twin with serial number was made in 4during April 04 and may have been the th amp made that month Caution is needed for dating amps from,and The serial numbers from these years were duplicated in,an respectively. Taking the example Super Echo Twin above, its serial number alone could denote April or April A Mercury with serial number could be from September or it could be from the second serial number system implemented in Luckily, it is very easy to determine which year the first digit denotes.

The key is the model and the cosmetics. For instance, the Super Echo Twin was made inbut not in Likewise, an Ampeg from would not be covered in blue check vinyl whereas an amp from would have this covering. An Ampeg from would be covered in navy random flair vinyl whereas an amp from would be covered in blue check vinyl.

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Another check for a versus a or later serial number i. Therefore, a serial number where these two digits are greater than 12 must be from the second serial number system - A final cross check with EIA dated components should remove any doubt about an made during the - 65 period. This system overlapped with the previous serialization scheme for a period of about 6 months.

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These are also 6-digit numbers, which appear to have been applied sequentially, but they are not date encoded. Enough information serial numbers, model, date codes has been gathered to prepare the following guide for dating by serial number.

Like other Ampeg amps of this era, the Jet 12 experienced some variation both in its enclosure style as well as in its electronic configuration. In this era, the model was also designated as the JD Jet and used a solid-state rectifier. Years of Production: - /5(3). Dating your Ampeg Question: When was my Ampeg built? Answer: In dating Ampeg Amplifiers, there are several different schemes to be used. The good thing about Ampeg is that when they changed their models, they all changed at the same time. This means that it is fairly easy to determine the range of year by just looking at the outside of the amp. The amp I'm talking about today is the Ampeg Jet II J12R (12T, for those who prefer the tremolo instead of reverb). It is a wonderful amplifier able to play a luxurious clean. Whether you connect a Stratocaster or a Les Paul the result is always the same: a legendary tone that only a Fender worth $ .

Note that the year associated with a range of serial numbers is very rough and will likely change as more information is gathered for refining the estimates.

The EIA date codes of original components should be used to confirm an approximate date of manufacture.

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Serial Number Range Year to to to to to through The third serial number system was implemented in Not enough information was available to the authors to determine year of manufacture by serial number. An added variable is that during the Magnavox years, Ampeg may have used separate serial number systems for each model or for models that shared the same chassis like the VT and V Until such time that enough information is available to date s Ampegs by serial number, the features of the amps from this period can be used and compared to the following table.

Feature Years Used Blue control panel graphics - Black control panel graphics with square corners - Black control panel graphics, horizontally split with rounded corners solid state amps - Black control panel graphics, horizontally split with rounded corners tube amps - Distortion control knob - White rocker switches solid state amps - White rocker switches tube amps - Black rocker switches - Metal "a" logo - Plastic "a" logo - - The MTI-era amplifiers cannot be dated by serial number.

However, all MTI-era Ampegs were made in the relatively short time period between late and Louis Music era were all made after The amps made since have a digit serial number which is encoded for model, country, date, and year. Jan 28, 4. Mar 30, 5.

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Dec 4, Seattle. Don't know what the X is but if it's a '92 then it's a US made cab. Apr 28, 6. Apr 28, Winfield, Pa. Apr 28, 7.

Apr 1, 6. Messages: 8, It could be a very early transition JD. The chassis was probably already stamped for the rectifier.

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Apr 1, 7. Ampeg did indeed use various tubes,without always keeping the schematics up-to-date.

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Apr 1, 8. So since mine as 3 x s no S. Apr 1, 9. Got a pic handy, or can you take one and post it? Apr 1, Oops, I was wrong.

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It has only 2 x s, the last tube is a 5Y3 rectifier! There is a paper tube list inside the amp, and for the pre-amp stage it lists: 6BK11 or 6C10 6C10 Mine has 2 x 6C10s, 2 x s, and 1 x 5Y3. The "blue check" Tolex is more dark grey but you can see just a hint of blue in it. May 17, Messages: 1.

So what year is my Ampeg Jet J? EL84sterMay 17, You must log in or sign up to reply here.

Ampeg jet dating

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Dating Ampeg Amplifiers. Mercury and Jet. They were tan colored amps. In the '60s and '70s Ampeg developed the Portaflex Amp, the B, the SVT, the V4 and the Gemini series. Locate the EIA (Electronic Industries Association) code on the the pots of the amp. This is usually a 6 or 7 digit code that is a very accurate way to date the Ampeg amp.

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