SOLD
Four excellent working tubes, all measure strong. These are lower gain variants of the 12AX7. Perfect for phono and preamp applications where you need less gain. These were a great upgrade in my phono stage and a couple of preamps that I tried them in - way better than the modern Chinese and Russian 12AX7's I had for comparison.
The tube marked Beckman has an extra spacer so the construction isn't identical, but it is very close and is clearly also a GE-made 5751 tube. $70 + shipping for the lot.
