by Eric Barbour The BASICS Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current. The “Fleming diode” was based on an effect that Thomas Edison had first discovered in 1880, and had not put to useful work at the time. This diode essentially … Continue reading All About Vacuum Tubes →

A small collection of schematics. Since these are easily found almost everywhere on the net, I’ve included copies here for both posterity and completeness.

Regular maintenance on Digital Pianos and Electronic Organs is essential to keep them in proper working order. While not all organs of a given make will need all these maintenance items performed (example, late model organ often CANNOT go out of tune) the following list will act as a guideline for how often a technician … Continue reading Recommended Maintenance Schedule →

Collection of Instruction sheets for various connector kits; may with schematics, and related materials.

This page is intended to be used with the “Leslie Pin-out Data” page to help you connect your Leslie cabinet to your organ. Connecting to a late model Hammond™ Tonewheel Console (Models: B2 / C2 / RT2 / B3 / C3 / RT3 / A100 / D100) Connecting a 122 type cabinet to a B-3 … Continue reading Hookup Tutorial →

Hookup Diagrams and Guide for various common Leslie interface schemes.

Collected guide to Hammond and Leslie Tone Cabinets, providing images, hookup information, and technical specs about various vintage speaker cabinets.

A mini-dictionary of special terms used here.