Hickok 539-A Tube Tester calibrated
This Tube tester was serviced with new resistors, caps and complete adjustments for correct signal levels and meter bridge setting etc. I also replaced the 83 Rectifier Tube with Solid state replacement to reduce the load on the transformer. 539 A is the earlier version of 539B/C and has almost the same features like Self bias terminals and Plate Current Measuring terminals etc. Also signal level can be switched unlike entry level 600 A or 800A versions. This model can be a versatile Hickok like 539B or C without fancy price.Plate Voltage, Screen, Grid Bias and Grid Signal levels were checked after adjustments. also the Meter bridge was adjusted for correct meter reading for Micromho based on Daniel Schoo 539 C calibration method on all ranges. I also checked a known calibration sample 6L6 for correct reading along with few 12AX7 tubes. All are showing correct reading. I also use Brent Jesse Recording Sample calibration 6L6 tube for checking this tester.
Few points to note.This tester will not be shipped overseas due to fragile as well as size of the tester.The wood was the original 539 A box but the covering was really not worthy of this tester when I got it. So I removed the decayed covering. The wood box is not of great quality ( as Hickok boxes were meant to have the covering to make it look better than bare wooden box. The buyer can get it covered using Tolex or suitable material. I had done such a work on 800 A model and can guide the buyer if he wishes to do on his own. This tester is over 50 year old and hence the top looks its age. However I had replaced the power cable with 3 pronged safety 3 wire power cabling. The earth is connected to the top Metal plate to avoid issues with power input.
Please ask questions before offerding
Item will be shipped with insurance and the shipping costs are reasonable for the size and weight of this item. Considering the effort to service and calibration the reserve is reasonable and buy it now is good bargain.
I travel for my regular day job and so this item will ship only during week ends after the close of listing.
