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If you can track down the date code, simply refer to the following set of tables, which provide an accurate record of the date codes used throughout the years.
I just got what appears to be a 2x12 Fender cabinet with 2 Utah speakers init.
" And if your speaker is in reasonably good condition, then it is straightforward to find this out for yourself.
Since 1956, all Celestion chassis drivers have been stamped with a date code (two numbers and two letters), denoting exact date of manufacture.
That’s probably a moot point, though—experience tells me that most original speakers in amps of that age are substantially fatigued and generally sound very weak. It's a great-sounding speaker, but with a sensitivity rating of 100 d B, it’s relatively efficient and would probably be pretty loud in that amp.
Let’s take a look at a couple speakers from Warehouse Guitar Speakers (wgs4.com) so I can better explain this.
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.
The other writing says MH12PXC - The second letter looks like an 'H', but,the top is light, it could be an 'A'. Not only does it say Utah on the back of the speaker, but the full numberis 328 (the correct Utah code) 547.
You should be able to find a number stamped somewhere on the speaker’s frame.
The format may look like this: 220 637 Here the number 220 designates the speaker as a Jensen, and 637 indicates a production date of the 37th week of 1956 or 1966.
There are quite a few potential causes of this symptom, and it’s impossible to diagnose your amps without having them on the bench.
I’ll list a few possible causes, but be aware that the cause of the hum in one amp isn’t necessarily the cause in another one. I hope these tips help get your Fenders into phenomenal form!