Dating jensen speakers code
Again, I would like to thank everyone who responded to our request for data as outlined in Parts 1 and 2.The main focus of this article will be speakers found in Fender amps, but before we get into that topic let’s go over a few other areas first.Jeff Bober is one of the godfathers of the low-wattage amp revolution.He co-founded and was originally the principal designer for Budda Amplification, though he launched EAST Amplification (eastamplification.com) in 2010.If you want the least volume from your amp, search for a speaker in the style you like with the lowest SPL rating.Another option you might consider: Eminence (eminence.com) makes a speaker called the FDM, which stands for “flux density modulation.” (Yeah, it sounds a little Back to the Future.) It comes in both American- and British-voiced versions and has a very unique feature: a large knob on the rear of the speaker that allows you to adjust the strength of the speaker’s magnetic field, effectively changing its sensitivity. Let’s move on to your Pro Reverb and Twin Reverb amps with hum issues.
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 1950s.
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 220325 on a speaker, you can tell that it's a Jensen speaker, but the year is either 1973, 1963, or 1953 from the '3', and the '25' is the week of production.