In a BF Vibrolux Reverbs you could have either Jensen, CTS or Oxford, the BF Super Reverbs had Jensen, CTS, Oxford or sometimes JBL, the BF Pro Reverb had Jensen, Oxford or Utah, .In the silverface era Eminence, Oxford, Utah and Rola were more often used and Jensen was phased out.The first letter is the year and the second letter is the month. If the tube chart is not in the amp or has been torn or damaged and you cannot read the ink stamped letters you can date the amp by the codes on the potentiometers.

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The first three digits are the manufacturer’s code. The fourth digit is the year of manufacture and the last two numbers will be the week of manufacture.

So if the number on your potentiometer is 304728 it is decoded like this: 304 is the Stackpole manufacturer’s number, 7 means 1967 and 28 is the 28 week of 1967.

Look at the inside of the chassis, clean, caps are in great condition, tube sockets in great condition.

Listen to the you tube, reverb and tremolo work perfect.

Although the Cabinet letter code on the inside tubes specs QB is 1967 the Chassis code A 11464 is a 1968 chasis.

The speaker configuration is right on at two Altec Lansings parallel into 4 ohms output to the amp as specified. Also looks like the right conner metal where the light is bent probably from taking the chasis out to change tubes or inspect, it's not broke.

Our Buyer’s guide to vintage Fender amps explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc.

Lots of different speakers were used in the blackface and silverface era Fender amps.

If you are unsure if the digit denoting the year is in which decade (1957, 1967, etc.) then try to determine this by the amplifier it is in.

Tweed amps were made from the very early 1950’s through approximately 1960, blonde and brown amps were introduced around 1961 through 1965, blackface amps with black tolex started around 1964 through 1967 and silverface amps took over in 1968.

ampwares.com/amplifiers/fender-silverface-twin-reverb/ fender.com/support/articles/amplifier-product-dating/ Although the QB indicates 1967 the Silver Face Twin Reverb didn't come out until 1968, just another one of Fender's many dating flaws.. The chassis number on the back right engraved (hard to see) is A 11646. Many notable musicians have used Fender Twin amplifiers, including the Beatles,[2] (1968 Twin Reverb amps using the AC568 circuit),[3] Jimi Hendrix,[4] Eric Clapton,[4] Keith Richards from the Rolling Stones, Jerry Garcia and Eric Johns This amp is in excellent condition but there is some stain on the front grill I don't know what it is or from I'm suspecting the thick vinyl cover that comes with the amp. The name plate on the cover came off finally I'm surprised it lasted that long but I have it and will include it, should be on my work bench some where I hope, I hope.