AB crossover
Amp Classes Defined
Amp Classes Explained
Amp Mods Harmful
Bass Cutoff Frequencies
Bias adjust safeguard
Bias Cathode Resistors
Bias Shift
Biasing methods
Channel Switching LDRs
Choke Input Filter
Circuit Memory
Drop B+
Eyelet board
Fender Response Curves
FET source follower
Filament Cathode Ground
Fixed to Cathode Bias
FM Transmitter Voltages
Grid Blocking
Identify Power Trans Leads
Load Impedance
LV No PC boards
Output impedances
PC Boards
PCB amp problems
Phase Inverter Resistors
Pilot Light Tone
Rectifier voltage drops
Resistor Design
Resistor Max Voltage
Resistor noise
Reverb Tank Types
Reverb tanks
Screen Grids
Standby Switch Ratings
Standby switches
TAME Digest
Tone Circuits
Transformer Design Book
Transformer Info
Transformer Placement
Zener Voltage Drop


Buy the Book!

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

I also write Science Fiction, so you can sample some of my best stories. Also available in Kindle format.

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 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