Hickok 539C Tube TesterNew Main and Bias MetersAC Line & Bias Jacks for Digital MetersBias FuseNew Tolex by ProClean & CalibratedSee pictures 6, 7, 8, 9 for calibration specs, some additional notes, and relative information for this 539C.
Hickok 539C with Bias & AC Line Jacks for Digital Meters Calibrated & Clean.
All the meters are accurate.
New capacitors and added protection diodes for the meter.
This 539C can be adjusted to work on 230 volts.
Directions are in one of the manuals on the DVD,
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. Same with the AC line jacks; 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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