5814 is a good sub for 12AU7 tubes
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.Tested at: 97/100 plate current 12.1/12.2
98/98 plate current 12.1/11.9
Average new: 93/93
Minimum good: 56/56
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Matching date codes 55-3 56-04 188-5 Construction: short gray plate triple mica
Glass: clear with 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!