What's that Date?

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Fender Amp Date Codes

Fender amps can be dated by a rubber stamp on the Tube chart. Some Speakers have a similar rubber stamp. What you are looking for is 2 letters which indicate the month and the year that the amp was manufactured.

Enter the number and then press the Set button to see the month and year
Tube Chart Stamp:
Year Month:

Jenson Speaker Date Codes

Early Fender amps up to the 60's had "Blue-Cap" Jenson Speakers. There is often a 6 digit code code stamped on the edge of the speaker which will help identify the age of the speaker and the age of the amp. Since Speakers are often replaced as the old ones are blown out by Harmonica players and Jimmy Hendrix fans there is no way of being sure that the date on the speaker is the date of the amp. It is, however, a good indication. Since the decade is not indicated in the number it can be 1940, 1950 or 1960. You have to guess by using the date of the amp or by the condition of the speaker.
If you find a number that starts with 2 letters on your speaker use the Fender Amp dating form.

Enter the number and then press the Set button to see maker and date
Speaker number:
Make, Date:


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I cleaned up my tab for Sonny Boy's Help Me and made it into a short book. There's a Kindle version for 99 cents, and if you buy the paperback you get the Kindle free.

Playing "Help-Me" In the Style of Sonny Boy Williamson II: A step by step, note for note analysis of some of Sonny Boy's Signature Riffs

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Error Message Eyes: A Programmer's Guide to the Digital Soul

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The JT30 Page Popular links

I began collecting data about the microphones used by blue harp players before there was an internet. I began organizing it into JT30.com in the late 1990s. I accumulated more stuff than I remember. This is some of it.

Street Theory

A Harp Player’s Guide to Music Theory

Learning Harp

Picking Up Blues Harp

A guide to learning to play Blues Harp

Microphone Information

Usenet Articles

Harp Amps

I've been collecting Harp Amps for a while. This is the old Harpamps.com website. There is lots of information here. Here a coupld of links.

Harp Tab

A collection of songs and riffs that I’ve worked out over the years, plus some libraries of stuff I’ve converted to tablature. I’ve included most of the notes and instructions that helped me when I was learning to play blues harmonica.

Basic Riffs Simple harp tabs for songs Blues riffs and phrases.

Harp-L Archives 1992 to 2002


Harp Frequently Asked Questions