On 3 digit date codes, you have to "guess" the decade of the pot or speaker. Usually this isn't too difficult. Pots used by Fender.
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- Re: How to Tell '50s Jensen Speaker From '60s?.
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The pots on the left and right are Stackpole pots manufacture Note the different position of the markings, even on pots from the same maker. The source-date code on a speaker. In this case, the speaker is made by Rola in the 9th week of The decade, though not directly shown by the source-date code, was easily determined because this particular amp was only made during the s. Note the font style of the source-date code number always seems to be the same, for all speaker manufacturers. Jensen speaker made in the 41st week of Here are the most common pot manufacturers the first 3 digits of the source-date code: During the 's, Fender used mostly Stackpole pots.
Then in roughly early , they changed to CTS pots. This supply lasted for over five years. So guitars and amps made as late as can still have date codes from this huge stocking.
Dating jensen speakers
Till about , Jensen was the only Fender speaker supplier. Then from and later you see Fender using speakers from all the above mentioned makers. National, Valco, Supro Amplifier Products. Note the use of "" as a source code on these products. Actually, it's not a source code but is a manufacturers code for all National, Valco, Supro products. 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.
Below are many manufacturer source codes which are the first 2,3, or 4 digits of the source-date code. Common Guitar Speaker Manufacturers: Prior to the re-structuring of Jensen in ''72, Jensen quality had suffered terribly. When Rola started to make speaker for Jensen in , Rola initially used the Jensen manufacturer code, but by the end of changed to the Rola code. Other Speaker Manufacturers thanks to P. With all this information in mind, can you identify the following manufacturer and date of these source-date codes?
Can you see why? If you can't, read the above information again! Jensen was a very popular maker of guitar amplifier speakers during the s and s.
Help dating a Jensen speaker
Fender and Gibson used them, and did many other makers. There are some other codes used on Jensen speakers, as shown below.
The first set of codes shows the type of magnet, size and quality of the speaker. The "P12R" identifies the type of magnet, the size, and the quality of the speaker. The prefix code letter identifies the type of magnet used in the speaker. Prior to the s, Field or ElectroMagnetic magnets were used.
Date and characteristics of some old Jensen Speakers
Instead of a permanently magnetic magnet, electricity was used to make the magnetic field. These became obsolete with good Alnico magnets and weren't used much past the s. For the best guitar tone, it is generally agreed "permanenent" Alnico V was the magnet of choice. AlNiCo was the mainstay for decades because it produced a strong magnet which worked great in speakers.
It was largely discontinued because of higher cost compared to newer materials there are other rare earth metals now, such as samarium-cobalt and neodymium-iron-boron aka NIB that are now often used. Also Ceramic magnets were cheaper to make than Alnico, hence their usage in the s instead of Alnico. Here are some of the Jensen prefix codes: At some point in the s Jensen stopped using Alnico V magnets and used ceramic magnets instead , but kept the "P" prefix!
Jensen made speakers from 4" to 18" sizes.
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The suffix code letter identifies the quality of the speaker. Jensen speakers came in varying quality levels. They had a Professional series, a Concert series, and a Standard series. The closer the suffix code letter is to "A", the higher the quality of speaker. For guitar amplifiers, the Concert series is considered the best the professional series is too efficient and doesn't "break up", the Standard series is too whimpy and can't handle any power.
Here are the series code letters: Best for guitar amps. Gibson used some pots with strange codes during the s that were confusing. Utah loudspeakers a recent remark by message board poster indicating that many speakers sold under the trusonic label were jensen was the only other major raw. It is fairly easy to date the speakers themselves what speakers do you recommend jensen mod 12 speakers for fender and marshall jpmac top: The fender '65 deluxe reverb combo amp has a sound big enough to cut through the muddiest mix, but it's small enough to turn up make the most of natural tube distortion in small clubs.
Blues junior revision history fender adopted a two-letter dating code in i have the tweed with a jensen speaker and an eminence driver.
How to Tell '50s Jensen Speaker From '60s?
Shop speakers for vintage and modern fender amps and audio products, including celestion, eminence and jensen brands browse our collection now. What are the specs on this vintage jensen as were almost all jensen speakers this was part of an article in 20th century guitar about dating. 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.
A loudspeaker or loud-speaker or speaker jensen was, for years after the this design was the original loudspeaker design, dating back to the early telephone.