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Older Test Equipment

This site is under VERY heavy construction.

page in progress .... check back often!

General Radio - obsolete, ancient, out-of-date, old tech. I love 'em. (Click on the images for larger view):

GR 1161-A Capacitance Checker - view 1

GR 1161-A Capacitance Checker - view 2

GR 1161-A Capacitance Checker - view 3

G/R 650A Impedance Bridge and Type 219-K

Signal Corps - Impedance Measuring Box (RF)

Signal Corps - Model 470-ZA Impedance Measuring Box (RF)

This instrument is housed in a steel box with cover. Obviously designed to be portable. (smiley)

470-ZA Schematic and Detail

470-ZA Front Panel Layout (Front View)

470-ZA Panel Layout (Rear View)

General Radio Impedance Measuring Bridge

This unit was built for the U.S. Signal Corp. The Measuring Bridge is in the upper right corner, and does not carry a GR logo. The section below it is the large GR tuning capacitor, and the left section is a standard GR Resistance Substitution Box.

Signal Corp Impedance Measuring Bridge

Power Supplies and Chargers
Timers and Drivers