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Content. File:McKinney Valco guitar amp (c.1940s).jpg. Dating gretsch amps. Airline (brand). Dating Gretsch and other Valco-made amps. File:McKinney Valco guitar amp (c.1940s).jpg.
Buy for othersWe use cookies to provide you with a better experience. By continuing to browse the site you are agreeing to our use of cookies in accordance with our Cookie Policy. This same McKinney amp can also be found in the National catalog as model What makes this amp interesting and probably historically important is that it was one of the first Valco guitar amps to use 6L6 power tubes. These two models were certainly the top-of-the-line guitar amps in their day. There are many, many great sounding Valco amps spanning about three decades, but these early amps offer a unique sonic experience. File:McKinney Valco guitar amp (c.1940s).jpgThere seems to be a problem serving the request at this time.
Gretsch is a music brand that has made basses, drums, guitars, and guitar accessories for more than a century. Many Gretsch vintage guitar amplifiers are still available for collection and use. Gretsch is a brand that was first established in but didn’t begin manufacturing amps until the s.
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Pot codes and source codes information below:The following information is taken from excerpts from www.guitarHQ.com. As well as other reference material both in my personal vintage guitar library and the internet, Please enjoy this information and use it as a guide to helping date your vintage guitar or vintage amp. These codes often overlap within a few months to as much as a few years when used to determine the originality of a particular vintage guitar or amp. The best way to date your vintage guitar or amp is from the manufacturers serial number and then use this guide as a reference to date the parts that make up said guitar or amp.Dates and source codes to help aid and determine the age or year of production of your vintage guitar,amp or other electronic instrument.
Below are Vintage Guitar Codes to help you.Source-Date CodesOn American made vintage guitars and gear, the pots and speakers provide an excellent opportunity to date a piece of equipment by referencing their 'source-date code'.The source-date code found on pots and speakers gives the manufacturer and date (roughly) when the components were made. 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. This is especially helpful on (less popular) gear that doesn`t have reliable serial#`s or other information to date them.The source-date code will signify the earliest possible date that the instrument or amp could have been made. This isn't going to be exact, but it will give you a 'ball-park' age. And remember, even the dates indicated by the pots aren't that exact.
For example, if you buy a brand new CTS pot today, they are dated a month or two in advance! I don't know the reason for this, but it's worth mentioning.The source-date codes are under the framework of the 'Electronic Industries Association', which is a non-profit organization representing the manufacturers of electronic parts.
The EIA source-date code is a numeric code, assigned and registered by the EIA. It can be stamped or marked on any product to identify the production source (vendor) and date of manufacturer. Source-date codes have been published by the EIA since 1924. The EIA can be contacted via mail: Electronics Industries Association, 2001 Pennsylvania Ave NW, Washington, D.C.
20006.Consideration and exceptions:Source-date codes weren't an industry standard until after WWII. But I have seen them used on Stackpole pots on electric National guitars as early as 1935. The first time date-source codes were published was 1924, so I guess you could see them as early as the late 1920's.Most Fenders from 1966 to 1969 have 1966 dated CTS pots. Apparently CBS/Fender bought a large stock of pots in 1966 that lasted till 1969.On popular Fender models, the pot date can be very close to the actual date of the instrument. On less popular Fender instruments, such as LapSteels, pots can be as much as two years earlier than the actual date of the instrument.Gibson didn't start using pots with source-date codes till 1953 or 1954.Originality.Of course this all assumes the pot or speaker is original. You have to make that call. I would suggest checking the solder joints - are they clean?
Are the wires of the right era (cloth insulation for older stuff)? If so, you can check the pot or speaker for the source-date code, and determine an approximate age from that.How the Source-Date Code Works. The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it's ink-stamped or paint-stamped on the 'bell housing' of the speaker.In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code.The remaining 3 or 4 digits are the date code.
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In 3 digit dates code, the 1st digit is the last digit of the year. On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year. In either case, the remaining 2 digits are the week of manufacture (01 to 52).
With this in mind, remember if the last two digits of the source-date code are greater than 52, you're not looking at the source-date code!Also it's worth mentioning:Sometimes there is a space or hyphen between the manuafacturer code and the year/week code.3 digit date codes were used in the 1940's and 1950's. Stackpole for example converted from three to four digit date codes in late 1959.4 digit date codes were used in the 1960's and later (this makes determining the year much simplier!)On 3 digit date codes, you have to 'guess' the decade of the pot or speaker. Usually this isn't too difficult.Pot Source Codes.Here are the most common pot manufacturers (the first 3 digits of the source-date code):106 = Allen-Bradley134 = CentraLab137 = CTS (Chicago Telephone Supply, pots and speakers)140 = Clarostat304 = Stackpole381 = Bourns Networks615 = IRC (International Resistive Company) - seeVintage Fender Products.During the 1950's, Fender used mostly Stackpole (#304) pots. Then in roughly early 1963, they changed to CTS (#137) pots. In 1967 (after CBS bought Fender), Fender bought a HUGE supply of pots from CTS. This supply lasted for over five years.
So guitars and amps made as late as 1973 can still have 1967 date codes from this huge 1967 stocking.All during Fender's life as an amplifier maker, then used speakers made by Jensen (#220), CTS (#137), Oxford (#465), Utah (#328) and Altec-Lansing (#391). Till about 1961, Jensen was the only Fender speaker supplier. Then from 1962 and later you see Fender using speakers from all the above mentioned makers.Vintage National, Valco and Vintage Supro Amplifier Products.Note the use of '550' as a source code on these products. Actually, it's not a source code but is a manufacturers code for all National, Valco, Supro products.