Hickok Model 540 Dynamic Mutual Conductance Tube Tester Manual $8.99 Hickok Model 540 Dynamic Mutual Conductance Tube Tester Manual quantity Add to cart 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 656 XC Color Bar Generator Operating Manual $9.99 Add to cart Hickok 890 In-Circuit Transistor Tester Manual $10.99 Add to cart Hickok KS-5727 Bell System Practices Tube Tester Manual $8.99 Add to cart Hickok 690 VHF-UHF Crystal Controlled Marker Calibrator Operating Manual $9.99 Add to cart