Hickok 600A Tube Tester
See pictures 6 and 7 for calibration specs and some additional work information for this 600A, and picture 4 shows the added line adjustment calibration potentiometer. 
 
This is a nice solid 600A in really nice condition. Nice solid original Hickok meter with the addition of a new 150uF capacitor. Very clean inside and out. Although the leatherette is faded there are no rips or tears, and all the hardware is still in nice unrusted condition.
                                                            
You can have this 600A calibrated at no charge withing three years of the date of purchase, but will have to pay for the shipping. There may be additional charges if parts are needed such as new rectifiers e.g.  You will receive a calibration card with the date of calibration that can be kept seperate from the tube tester.
 
Please see the calibration information in the pictures.
 
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