Matched Pair Siemens 5751/12AX7 Triple Mica O-Getter Made in Germany Label is mostly erased. Very Rare Siemens 5751 Pair. Same Date Code: RØ 2≠ 9L Made in Germany Fully tested by calibrated Hickok 539C tube tester with no shorts, leakage or gas. Measurement:  1550/1650 1680/1570 where minimum good value is 875 Strong and tightly matched pair! Tested in my preamplifier to make sure working as intended with no issues at all.

I will gladly combine shipping upon request.

__________ The tube(s) in this sale include a 30-day satisfaction guarantee. I strive to ensure you have a completely satisfactory purchase experience. If you are unhappy with your purchase for any reason, you can return the item for a full refund. Please contact me directly prior to opening a return or leaving feedback. I will almost always reply at least within 24 hours  to remedy the situation for you with direct communication.