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Supro amp serial number dating

Welcome to Amp Archives, a photographic archive of audio amplifiers for reference.

You can search as well as browse the archives using the main navigation menu.

Photos and history courtesy of Mike & Mike’s Guitar Bar, Seattle, Washington.

This 1950’s Fender Champion belonged to the late Kim Sherman, lead guitarist for the Frantics.

While the singular CTS pot in the circuit dates to the 46th week of 1956, the mint tube chart has a “GD” date code which translates to April of 1957, and the Oxford 8″ speaker dates to the 15th week of 1957 as well.

The Gospel Machine’s matching Tweed Champ is now included in the Amp Archives here.

In 2011 the Dumble Overdrive Special was assessed as the most valuable guitar amplifier on the market, with used amplifiers fetching on average between $70,000 and $150,000 each.

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With a scant 300 Dumble amps estimated to exist, the myth, the demand and the history of each amplifier continues to grow.Examples: S/A 4779 G 1975 Model #1987 JMP Lead S/A 4279 H 1976 Model #1987 JMP Lead S/A 08840 H 1976 Model #2204 JMP Master Volume More Examples Letters were used as date codes to represent the year of production and this letter followed the serial production number.Letters B, I, O and Q were not used to avoid confusing letters with numbers.These were comprised of nine digits in the format of xx-xxxxx-xx (though not always).These serial numbers can be decoded as follows: Examples: 93-10232-12 1993 Model #9100 Valve Amp for JMP-1 RI 95-94082-45 1995 Model #2245 JTM 45 Reissue S/A 95-54517-05 1995 Model #2203 JCM 800 Master Volume RI/ 969096734 1996 Model #1987X Reissue More Examples In August of 1997 Marshall switched to their current serial number format which contains more information and is easily decoded.The story of the Gospel Machine and it’s matching Fender Champ begins in a little town in Minnesota named Karlstad, where Christian and Ester Pedersen were farmers on a tract of land acquired through the U. In early 1957 Ester and Christian decided to purchase a new guitar and corresponding amp, and this Tele and Champ traveled all around Minnesota and the adjoining states.Christened the “Gospel Machine” by the Pedersen family, the guitar was passed down from Ester to her daughter Adeline.The model numbers can be somewhat confusing because model numbers such as 1987 or 1959 can be mistakenly interpreted as the production year of the amplifier.Amplifiers from this era must be dated within this time span based on their features, or component manufacturers and codes, including speakers, potentiometers and transformers.The guitar and amplifier remained in the family until 2001, at which point they were sold to one of the owners of Mike & Mike’s Guitar Bar where they are now offered up for sale.The original yellow Astron caps are present in the preamp, the original transformers are intact, and the chassis itself has a nearly flawless chrome faceplate with all of its stock white silkscreen lettering.

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