Pair of Sylvania 6GH8A vacuum tubes 
Tubes are identical in construction 
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at: 51/52 53/53
Minimum good: 38/42 
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date code: unreadable
Construction: round getter gray plate copper rods 
Glass: clear 
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!