Mercury Model 501 Component Substitutor Manual Sorry, this product cannot be purchased. $8.50 Category: Mercury Description Description For sale is reprint of Mercury 501 Component Substitutor Manual. Manual is 11 pages long, include part list and Circuit Diagram . Related products Mercury 2000 Tube Tester Updated Tube Chart $11.99 Read more Mercury 1400 In-Circuit Capacitor Tester Manual $7.99 Read more MERCURY 1101 Tube Tester Manual and Tube Charts $8.49 Read more Mercury 1100 1100A 1100B Tube Chart 1978 $9.99 Read more