From ja–(at)– Wed May 29 12:09:14 CDT 1996
Article: 16036 of alt.guitar.amps
From: “Jack A. Zucker”
Newsgroups: alt.guitar.amps
Subject: Re: Tone Secret
Date: Tue, 28 May 1996 22:14:56 -0400
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That explains why my ’71 Twin sounds so good. I just recently replaced
the jewel with a purple one. You see, the darker colors have higher
capacitance which acts as a low-pass filter. I’ve since replaced
the caps in the tone stack with various colored jewels. Here’s
the capacitance chart for the jewels:

Red 500pf
Blue .047uf
Purple .1
Green .022uf

…As you can see from the above chart, the Red jewel allows too much
high frequency content through the circuit. Maybe RGKeen or MGarvin
can explain this ?


> Jack A. Zucker | ESP Music
> ja–(at)– or | Voice: 216 349 5881 (home)
> Jack.Zucke–(at)– | Voice: 216 646 7796 (work)
> | Fax: 216 646 7766 (work)


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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 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 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