Hickok 539C Tube Tester
                                                                    Exclusively available at Hickok Meters
AC Line & Bias Jacks for Digital Meters 
Bias Fuse
Solid State 83
Clean & Calibrated
 
See pictures 6, 7, 8, 9 for calibration specs, some additional notes, and relative information for this 539C. 
 
Optional Bias & AC Line Jacks for Digital Meters. 
All the analog meters are accurate so you do not need to use multimeters.
Calibrated & Clean. 
New capacitors and protection diodes for the meter. 
Bias fuse added. 
 
See pictures 6 thru 9 for calibration specs and information that includes the added bias and AC line jacks for this 539C. These pages should tell you all you need to know about this 539C.
 
No trick to use the jacks just plug in a multimeter or other accurate DCV digital meter in the 2mm sockets, red to positive and black to negative (bias set to read  Positive voltage although negative voltage is being applied), and it will read the actual DC bias voltage being applied in the test. Same with the AC line jacks except positive and negative does not matter; just plug in a multimeter or accurate digital ACV meter in the 2mm plugs and it will read the actual AC voltage.
 
Please see the calibration information in the pictures.
 
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