JT30VC

A superb omnidirectional crystal microphone used by discriminating Harmonica musicians. The JT 30VC’s high output crystal element has been factory tuned to provide just the right presence or “bite” to create the ideal sound for blues and many other styles of play.

The rugged JT 30VC has a die-cast zinc housing which is “cup shaped” for a comfortable fit in the palm of the hand, and the JT 30VC includes an easy to operate volume control. It is elegantly finished in a non-reflecting black urethane paint with a brass plated grille.

 


Frequency Response

Specifications
Generating Element:
Crystal
Polar Pattern:
Omnidirectional
Frequency Response:
30 Hz - 8 kHz
Open Circuit Voltage:
-49 dB (0 dB = 1 volt per microbar) @ max. gain
35 mV/Pascal
Impedance:
High (Recommended load is 250K ohms minimum)
Phasing
Positive Pressure on Diaphragm generates a positive voltage on pin 3 relative to pin 1
Case:
Die Cast Zinc Alloy
Finish:
Body - Black urethane paint
Grille - Chrome Plated
NET Weight:
241 grams (8.5 oz.)
285 grams (10 oz.)

 

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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


1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003

Harp Frequently Asked Questions