Tested WEAK BVA 12AX7 ECC83 Blackburn Black Long Plates Tube - As is, read description.
mC1 B6O - 1956 Blackburn
This is being offered for someone looking for an inexpensive tube for experimentation as both section test below the minimum acceptable value, so are considered weak, however still function to some capacity, based on the values below. You may actually still get a little bit of use out of this or use as a display piece.
The sections test at 400/700 uM micromhos mutual conductance where 875/875 is the minimum acceptable value on a calibrated Hickok 539B tester. anything below 875/875 is considered weak.
Sold as is, so bid accordingly.
I posted other weak 'bargain bin' tubes and will combine shipping.