Thisvintage Jackson Dynamic Tube Tester Model 648A is in fair to good physicalcondition. I testeda 6SN7 tube and the results were comparable with my Sencore TC-162 tester. No other testing was performed. As can be seen in photo one of the switch buttons is missing. However, I have found one that will fit, but different color and will be included. I also use one of these tube tester on my bench.

This item isbeing advertised under the category of “Used” even though it may not meet allof the parameters in the original specifications for this item.

Due to theage of this item it is being sold AS IS.

If something should arrive not as advertised, contact me before leavingresponse.

If you have aquestion concerning this item please feel free to inquire through the question dialogue.

Shipping willbe within USA only, no international shipping.

Payment by PayPalonly!!