Heathkit Model RS-1 Resistance Substitution Box - Untested

Heathkit Resistance and Capacitance Substitution Boxes RS-1 and CS-1

EICO Capacitor Substitution Box Model 1120 Vintage Micro-Farads - untested

Vintage EICO Model 1120 Test Equipment⭐️Capacitor Substitution⭐️Untested⭐️

Vintage Heathkit Model RS-1 Resistance Substitution Box Works Great )See Descr)

Resistance Substitution Box Model: RSU-280 *UNTESTED*

Elenco Resistance Substitution Box Model RS-500

🍊Vintage 1960s Heathkit Resistance Substitution Box | Model IN-37