Amp dating, marshall serial numbers
The best approach is to cross-reference the serial number with known features for the model during different eras and the personal account of previous owners. Marshall amps had such precedent-setting wattage and tone that their history can hardly be separated from the history of rock itself. Look for original black levant covering, a gray grille and the old block-style Marshall logo. The year codes started over, with beginning at B, oddly enough. Advances have been made with regards to the production of tolex amps and it appears that much of this information can be applied to late s tweed amps as well.
Greg kept his illness very private, even from this author. Since Fender used speakers from all the above companies. Second tube is a driver stage for both channels of preamp, specified. These current serial numbers are arranged in a letter-ten digits-letter format A-xxxx-xx-xxxx-A.
And now for an important update! These codes have nothing to do with the serial number that is stamped on the right rear of the chassis - Those numbers are posted below. The earliest Marshall amp models did not have model codes or any official serialization, though some models had a simple sequential four-digit numbering system inside the back panel. There have been three coding schemes used by Celestion since Marshall's birth as a company, each using some combination of day, month and year.
During this era, Celestion speaker codes followed a month-year-day format. All Fender amplifiers, manufactured after include a date code on the amplifier. Good luck reading some of the hand written ones. Solid-state rectifiers do not wear out as tubes do, nor can they be replaced by the user. These have not been observed or reported so the answer remains unknown.
Third tube is the driver and reverb recovery amplifier. This is severe duty and will use up the tube's cathode quickly. Amps from this era still have the block-style Marshall logo and a centered chassis. These were almost always at the extreme left of the chassis, when looking at the rear of the amp.
Marshall Serial Numbers
Second tube is the driver and tremolo modulator. If you really want to know the differences, we recommend you consult past issues of Vacuum Tube Valley magazine. Remember, your amp is newer than the newest component. They drive the output transformer, then the speakers. Oops, high class matchmaking looks like you forgot something.
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- Bias should be adjusted when tubes are replaced.
- Third tube is the tremolo.
- Fourth tube is the phase inverter.
- This is probably the biggest area of confusion when dating Marshall amps.
- Princeton and Princeton Reverb.
Marshall used letters as a date code to represent year of production. With all this information in mind, can you identify the following manufacturer and date of these source-date codes? It's also one more piece of evidence to pair with the serial number to corroborate the actual year. Often these specimens produced between October and December had an offset chassis.
If you're about to put down a hefty sum on a vintage Marshall, we strongly encourage you to consult multiple sources to determine the exact age and originality of the amp. This tube need not be low-noise or nonmicrophonic. Third tube is the Normal channel preamp. Many earlier Fender tube amps used rectifier tubes. For some reason, folks are willing to poke their head into tweed, blonde, brown and blackface amps, dating but not into silverface amps.
Production has continued there uninterrupted through today, though some lower-priced models are now made in China, India or Korea, depending on the series. The bottom line is to do your homework or enlist the aid of an expert. Andrew works in parallel with this research, but is specializing in the Rivera era blackface amps.
How can I find out how old my amplifier is
The best estimate is that about of these were made before the circuit was revised. Second tube is the reverb driver. Instead, there were approximately of these chasses produced, which then ended up as one of the three models in question. The letter B was skipped, as were the letters I, O and Q since they might be confused for numbers. Fifth tube is the phase inverter.
Here is another caveat about reading these tables. The First letter equates to the Year and the Second letter to the Month. There will be amps with serial numbers that lie outside of the listed ranges. The amps that received the stamped suffix must also be added to this sub-total.
The following charts are the revised dating tables for Fender tube amps. In addition, the dating-by-serial number tables have been revised and are more accurate. This is no different with published dating tables for vintage Fender guitars and basses. If three digits are present, the first digit would refer to the year i. Third tube is the driver and vibrato oscillator.
But other changes may be meant to deceive. Fender Transformer Wiring Diagrams. Check the era below that applies to your speaker. The first letter refers to the year, dating and the second letter refers to the month of manufacture.
This tube need not be low- noise or low-hum, nor does it need to be tested for microphony. Fourth tube is the driver. The guide below will help you quickly and clearly date Marshall amps and cabinets, without us waxing poetic about their influence. For better or worse, this concept is common to this endeavor.
These modifications are making this research more difficult for a couple of reasons. The year codes started over, with beginning at A. Very few of these were and those who own one of these oddballs can either be happy with the fact that it is a rare amp or be sad that the mismatched impedance means the amp is less efficient. Sixth tube is the phase inverter.
Getting the correct year is one thing, who is dating but getting the story behind an amp is the fun part. If it's a one-digit number you need to determine the correct decade of the amp some other way. These letters are the production date code for the amplifier.
This is the phase inverter. Using the month and year codes below, and knowing what order they are in for different eras, you can easily decode a Celestion speaker's age. Fourth tube is the driver and reverb recovery amplifier. This is the phase inverter tube. This tube need not be especially quiet, but its heater-cathode insulation must be very good.
How To Date A Marshall Amp
Paul Linden has volunteered to fill in for Greg. Vibrosonic Reverb silverface. In either case, the code works the same.
- So long as one tube from each pair is on one side of the transformer, and the other is on the other side, the amp will balance.
- The additional date codes for this era are below.
- Solid -state rectifiers do not wear out as tubes do, nor can they be replaced by the user.
Product Dating Fender
Therefore, if you have a push-pull pot, your amp is or newer. The progress of this type of work is slow, hence the long hiatus, however, a lot of new data have been collected regarding Fender amplifiers, including production numbers. Second tube is the driver and vibrato tremolo modulator. Fender phase inverters in later amps used a very crude circuit which also provided some voltage gain. Not too many people know more about the Bassman than Clarke.
How To Identify The Date And Value Of A Fender Amplifier
Common Fender Source Codes. In addition to A, it appears the stamping machine stuck on serial number A as four distinct amps with this number has been reported. Second tube is preamp, is specified. Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.