Hickok Model 540 Dynamic Mutual Conductance Tube Tester Manual $8.99 Category: Hickok Description Description For sale is reprint of Hickok 540 Tube Tester manual. Manual 7 pages long and includes Circuit Diagram. Manual comes with 4 pages of Ballast Tube Data, Part list and Operating Instructions. Manual is dated 1944. Related products Hickok 660 Color Bar Generator Operating Manual $8.99 Read more Hickok KS-5727 Bell System Practices Tube Tester Manual $8.99 Read more Hickok 203 Volt Ohm Capacity Multimeter Manual $8.99 Read more Hickok 532 Dynamic Mutual Conductance Tube Tester Manual $9.99 Read more