Dating fender tube amps by serial number part 1

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Jeff Bober is one of the godfathers of the low-wattage amp revolution.

He co-founded and was originally the principal designer for Budda Amplification, though he launched EAST Amplification (eastamplification.com) in 2010.

(I’ve also included a few others brands you might encounter as aftermarket installations.) This should help you identify your speaker.

The format may look like this: 220 637 Here the number 220 designates the speaker as a Jensen, and 637 indicates a production date of the 37th week of 1956 or 1966.Fender has used only a handful of different speaker types over the years.Here’s a list of brands along with their EIA codes.That’s probably a moot point, though—experience tells me that most original speakers in amps of that age are substantially fatigued and generally sound very weak. It's a great-sounding speaker, but with a sensitivity rating of 100 d B, it’s relatively efficient and would probably be pretty loud in that amp.Let’s take a look at a couple speakers from Warehouse Guitar Speakers (wgs4.com) so I can better explain this.

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