Either could account for the difference in size of the dust cover and difference in surround. They had a Professional series, a Concert series, and a Standard series. Though they are one piece of the puzzle and something to consider, don't put too much faith into a pot date. They need to be the same for a proper match. With all this information in mind, can you identify the following manufacturer and date of these source-date codes? Similar to Jensen's departure from Magnavox in 1925, frequently when engineers parted company with speaker manufacturers they went on to found their own speaker companies. That's a combination almost designed to demolish vintage alnicos.
These codes don't make a lot of sense, so are noted below. 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. It wasn't for shielding, I suspect, because the housing itself was ferrous and passed on the magnetic field just as if it weren't there. We have good experience with vintage style Oxfords, Jensens in a Tweed Deluxe 5e3. Is this a cause for alarm? One cab was loaded with 7 originals and one modern 32 ohm replacement - and the other was loaded with eight Sammi sp? Clean and distorted tones come out very differently in different speakers. But, like I said, it sounds pretty darn good hooked up to the Bassman.
Variation is the key and therefore, my friend, you need several guitars, amps, pedals and different speakers. They are powerful and clean. As you have probably noticed, there is plenty of information here to help date the brands that I am interested in. I have a very old 408 but it has Altec's alnico's in it but I have used this driver in other cabs. Also Ceramic magnets were cheaper to make than Alnico, hence their usage in the 1960s instead of Alnico.
Be careful that the speakers you mix are not too different in terms of efficiency, frequency response and sensitivity. If so, there are many good speaker blends to consider. I've always favored the Alnico speakers for most of my applications, and I was under the impression the Alnico's were more sought after for original Super Reverbs than the Ceramic's. If they sound the same, I wouldn't worry. It's really hard to find cts ceramics or alnicos in Germany. Capt, I think you are seeing the natural life cycle of paper cones. And remember, even the dates indicated by the pots aren't that exact.
There's some old solder in the terminals so it may have been in a few different boxes but has been laying in some guys storage shed for 20 years or so. Circa 1966 Eminence built three speakers per day to supply Ampeg. However, it might do well in a properly designed cabinet, like those that used to be found at the bottom of old jukeboxes. After many years with vanilla ice cream, the taste of chocolate will be a tone explosion, not to mention a mix of the two. It is also more sparkling than older C12n models.
Jensen 220 speaker made in the 41st week of 1959 941. The new speakers from Eminence with 9dB attenuation is a ground breaking development in speakers. Not only do they sound excellent at full output, they also give you a attenuated and tamed tone when turning the wheel on the back of the speaker. It just takes longer depending on their environment. Not as much top end, but more bottom. Great Vintage character speakers from Eminence. Many are original, many are professionally reconed.
You may compare these with your own speakers to determine what you have. There was a link to one posted in the Portaflex thread. Logo was a red crown. If you pull the back off the speaker in question you should be able to tell more. By flat, round surround do you mean a foam or butyl rubber surround? Just play at higher volumes, some chorsds and so on. The tone comes out very clean in distorted amps with this speaker.
The 2008 acquisition of Tusonix, Inc. 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. Powerful ceramic speaker, bright and powerful with lots of headroom. The same goes for efficiency. So it is as Klipschguy is saying.
New speakers will therefore sound different from vintage speakers. Most often we use extension cabinets at big stages or at unmiked gigs to fill the room better without playing so terribly loud. There are of course exceptions to our preference of American speakers. Others prefer a firm and clean attack in the low end that comes with higher powered speakers, more in the style of the blackface amps. On less popular Fender instruments, such as LapSteels, pots can be as much as two years earlier than the actual date of the instrument.