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Discussion in ' Amps and Cabs ' started by soundcurrent , Jan 29, Log in or Sign up. The Gear Page. Jan 29, 1. Messages: Hey guys! Quick question you will probably know or not know.

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Jan 29, 2. Messages: 2, OatieJan 29, Jan 29, 3. Oxford Speaker codes have a prefix number. The number after the is the year could be one or two digits and the next number is the week of the year.

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Jan 29, 4. Messages: 8, Jan 29, 5. I did not mean a real Bass amp, they are less efficient and darker sounding, not a good modern day guitar speaker. Many amp geeks don't like Oxford speakers found in Fender amps from through the s.

Oxford 8EV-40 speaker from 1958.

The gap distance was increased in the Oxfords that Fender used later in the decade and this reduced their efficiency and they were cheaper to make this way. Again, I say let your ears be your guide. I've heard many great sounding Fender amps with Oxfords. I will admit that I prefer Jensens, but I've never let an Oxford speaker sway my decision from owning a Fender amp.

Additionally, the Oxfords from early '60s generally sound very good.

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According to noted vintage amp specialist Gregg Hopkins, these early Oxfords were constructed similarly to Jensens from that period with respect to materials and voice coil gap. That could explain why they sound good.

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HotBluePlates and Khromo like this. Apr 8, 5.

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Big and bold. They have been favorites of mine in many amps before we all started changing everything in amps Porschefender and HotBluePlates like this. Apr 8, 6.

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Good posts swiveling - yes, I too am pretty sure the dash numbers indicate a subsequent version of the same speaker. BTW, I am pretty sure that while the coil gap was increased for the 12" speakers post, I think the 10" speakers were left alone.

Oxford speaker letter codes denote power handling. The higher the letter, the higher the power rating. I found an Oxford ad in a s trade magazine with the peak power ratings of some speakers: K = 25 watts, L = 30 watts, M = 40 watts, and T = 45 watts (12" speaker) or 60 watts (15" speaker). It is important to note that these are peakFile Size: 45KB. Oxford: Oxford speakers codes work in a similar fashion, but it is the letter that denotes power handling. The higher the letter, the higher the power rating. I found an Oxford ad in a s trade magazine with the peak power ratings of some speakers: K = 25 watts, L = 30 watts, M = 40 watts, and T = 45 watts (12" speaker) or 60 watts ( Make Offer - Vox 's Oxford Speakers 12T, 45W, Work Great $ Vintage Oxford 7 inch (see small print below) Speaker #P $ 4d 1h +$ shipping. Make Offer - Vintage Oxford 7 inch (see small print below) Speaker #P Vintage 12" Coaxial Speaker Alnico Driver 8 ohm Tested Working Wel OXFORDl.

Apr 8, 7. One thing about many Oxfords, they are not real efficient HotBluePlates likes this. Our research efforts are now in their fourth year will it ever end? Again, I would like to thank everyone who responded to our request for data as outlined in Parts 1 and 2.

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Early silver face amps: Part 2 went into this topic in some detail, but since that article was printed, I have been asked a lot of questions about this subject. Part of the confusion stems from the lack of any AB or AC tube charts. Fender never printed any since there were plenty of leftover AB tube charts available and these were used well into Although the cosmetics changed, the circuits remained unaltered from the blackface circuits on the earliest silverface amps.

The date of the change from the blackface circuit to the CBS silverface circuit was dependent on the model, but most of the amps that were modified received the circuit change by mid-year of The cosmetics of the silverface amps during the transition between circuits was also in transition making it difficult to determine circuit type on cosmetics alone. The amps during this period could have the earliest style silverface grill cloth or the more familiar silverface grill cloth. All of the amps would have the aluminum grill trim and they may or may not have the thin black vertical lines on the control panel.

One clue that can be used is the ink stamped chassis date code that is usually located in the chassis, but is sometimes found on the underside of the chassis behind the tubes.

Amp Model: Amp Config: Speaker Configuration: Replacement Speakers: Vibrolux Rev, Sil ' L6 Fixed Bias 40W: ", 8 Ohm CTS AlNiCo, Oxford 10L5, Rola. Oxford Speakers Dating A 50 ans et plus, vous etes encore loin d'etre un senior, votre vie sentimentale et amoureuse est loin d'etre terminee! Au contraire, un divorce, une separation ou un deuil est souvent synonyme de renouveau. Nouveaux amis, amants ou rencontres amoureuses, rencontres seniors: . = Oxford = Bogen = Electro-Voice Some tidbits on Jensen: Fender used Jensen speakers until when all Jensen production (and one engineer) was switched to The Rola Company in Cleveland OH (Rola was a division of Jensen). Prior to the re-structuring of Jensen in ''72, Jensen quality had suffered terribly.

These read something like T or F where the "66" and "67" denote the year and the "03" and "42" denote week of the year. Of course, the most foolproof way is to pull the chassis and look at the layout.

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In fact, on the watt and watt amps you can simply pull the chassis out about 2 inches and look for the big honking ceramic power resistors that are connected to ground from the cathode pin 8 of the power tubes. If those resistors are there, the amp has the dreaded CBS silverface circuit.

I am also confident that the serial number can be used as a rough guide for determining the circuit, but again, pulling the chassis is the only way to confirm.

Leo Fender was notorious for tweaking circuits and the results of some of his tinkering can be found on late examples of an amp prior to the switch to a new circuit.

Femme 23 Dating Vintage Oxford Speakers ans. Hello, j'aimerais faire une belle rencontre vers Saint-Nazaire ou ces environs, j'ai 23 Dating Vintage Oxford Speakers ans et cherche a rencontrer un homme plus age, libre en ce moment pour une rencontre, Besos + de photos Contacter. Apr 08,   Oxford Speakers - A History Lesson *** Excerpt from an article written by Greg Gagliano for Vintage Guitar Magazine: Oxford speaker letter codes denote power handling. The higher the letter, the higher the power rating. I found an Oxford ad in a s trade magazine with the peak power ratings of some speakers: K = 25 watts, L = 30 watts. Jan 29,   Quick question you will probably know or not know. I am considering purchasing some Oxford 12L6N speakers from a guy, and I am unfamiliar with this certain type of speaker dating. He says they are from 73 or 63, but I cannot tell. Here is the main number on the back: 12L6NXN Would this mean they are from the 12th week of ? Thanks a bunch!

Also, the different component values could be due to a necessary substitution on the production line when a particular value was out of stock. Ran out of K ohm resistors?

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Stick a 90K in there no one will notice or care at least not until the mid to late s. Often the differences are minor such as small changes in resistor or capacitor values. Perhaps the most surprising transitional circuit that has been reported to me thanks Brian! Two examples are known to exist; one from the February-March period and one from the March-April period.

These amps have AB tube charts and normally any silverface amp made prior to May will have the AB a. After Aprilmost of the big Fender amps received the AC circuit, which is a semi-cathode biased design.

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However, these two Showman amps have a fully cathode biased design that is factory stock!!! There is also an unconfirmed report of an early '68 Twin Reverb with the cathode bias circuit.

If you see one of these cathode biased amps, please let me know! These amps do not have a bias trim pot. The wire from the two K ohm bias resistors is connected to the brass control panel ground plate. The cathodes are tied together and connected to a single ohm resistor and 80 mfd V bypass capacitor which are both grounded at the other end.

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This cathode set up is similar to, but simpler than, the AC circuit. Every other part of the circuit power and preamp is identical to the blackface AB schematic.

Perhaps these two Showman amps were field prototypes, experimental units, transitional between the AB and AC circuit, or just a plain bad idea. Bad because cathode biased amps run very hot especially those with four power tubes witness the Vox AC In addition, a cathode biased Showman would produce something around 50 watts of power instead of the plus watts from a fixed grid bias Showman. According to the owner of one of the cathode biased amps, it runs very hot so hot that the tolex melted under the chassis mounting strap near the power tubes!

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Also, the amp eats power tubes, does not have much headroom and breaks up early. Oddities: One of Leo's experiments or "one off" custom amps surfaced recently. It's a circa tweed Tremolux 5E9 that has two factory stock Jensen Hi-Frequency tweeters with a passive crossover between the Jensen P12R and the tweeters. I wonder if Leo was influenced by Magnatone's use of tweeters?

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This necessitates removing the chassis from the cab to change the voltage setting which would only be a problem if you hopping from country to country with the amp. Interestingly, these amps have Triad power transformers while concurrently produced domestic models had Schumacher units. These mistakes were merely cosmetic. There were quality lapses in the circuits themselves during the CBS years, some of which had serious consequences.

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Examples of these include ceramic caps used in parallel to achieve the correct value instead of a single cap, change to often inferior sounding "chocolate drop" caps, and incorrectly wired circuits.

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