Pair of GE 6678/6U8A vacuum tubes new old stock in box 
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at: 105/96 plate current 11.2/21/9
                  94/89 plate current 10.2/19.5
Average new: 94/94
Minimum good: 57/57 
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Matching date codes HI 188-5
Construction: gray plate round getter copper rods 
Glass: clear chrome top 
Base: 9 pin
30-day free return.
We combine shipping $1.00 for each extra tube purchase.
Your items will be packed very well and shipped promptly.
Always glad to answer any questions.
Thanks for looking!