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Post subject: Dating a Deluxe Reverb
Posted: Sun Jul 17, 2011 11:12 pm
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I have a Deluxe Reverb amp but don't really have an idea how old it is. I'm just pretty sure it was made before 1980. I was researching about using the EIA codes to date the amp, but was unsure about how to interpret my codes. The code on the big transformer was EIA-606-730. The code on both of the smaller transformers was EIA-606725. I understand that the transformers were made by Schumacher, but the final three digits confuse me. Do the digits 730 mean the transformer was made in 1967, 1972, or 1977? I figured it was 1977 because it's a silverface, and also because the last digit is a 0, and there is no 0 week. But if someone could confirm this, that would be great.


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Post subject: Re: Dating a Deluxe Reverb
Posted: Mon Jul 18, 2011 12:03 am
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Use the data here to determine what year your amp's serial number correlates to......

http://www.superiormusic.com/page195.htm

EIA manufacturing codes are relatively easy to decipher once you understand the format. In the case of a Schumacher tranny, that company was assigned the "606" prefix. The subsequent digits indicate the year and the week within that year in which a particular component was made. In your case the codes are somewhat ambiguous in that the "606-730" and "606725" could either refer to 1967 OR 1977. If your amp is a blackface then the trannies are likely from '67. However, silverfaces also appeared in the spring of '67 and were sold up until around 1980. Then it's imperative to cross-reference the EIA codes to the chassis's serial number and other visual cues. There may be an ink-stamped build date on the inside of the chassis, adjacent to the location of the power tranny. These markings began to disappear around 1970.

Best of luck, HTH

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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