"Tube Tidbits" are articles written by Jim Cross on a variety of tube and related topics. Just click on the title to read the article. Enjoy!

Substituting for the 7591

Wunderlich Tubes (who made them and how they work)

Octal Tubes and Their Predecessors (cross reference)

RCA Receiving Tube Manuals (pictures)

Antique Tube Equivalents (cross reference)

Two Digit Types from 1 to 100 (descriptions)

The Amazing Crosley Autoexpressionator

An FM Crystal Set

A Note on Bernie Magers

The Founding of RCA and the Relationship between RCA and Cunningham

Gold Seal Metal-Glass Tubes