This is a General Electric GE 12AX7A / 7025 vacuum tube, which is a NOS (New Old Stock) item. It is a vintage tube that is suitable for use in audio and video equipment. The brand of the tube is GE, and it is designed to fit into a variety of models, including the 7025. This vacuum tube is a great addition for enthusiasts of vintage electronics, and it is sure to improve the performance of your equipment.
eBay
Tubes are identical in construction look like RCA. Construction: long gray plate round getter copper rods. Tested at: 99/102 plate current 11.5/12.4. The minimum is equal to 65% of the life of the tube.
eBay
eBay
Made in December 1960 in Heerlen Holland. Labeled as "Harman Kardon by AMPEREX". Date Code: I63 Delta 0L3. Made in Holland. Large O-Getter. ____ ______. Tested in my preamplifier to make sure working as intended with no issues at all.
eBay
Both tubes feature short grey plates with a top-mounted "O" getter. CLEAN tubes with clear lettering and nice straight pins. Test VERY STRONG on my Amplitex digital tester with BALANCED sections! I have two of the best tube testers ever made that I use to fully test tubes.
eBay
Closely matched pair at ~ 3%. Matching codes also. Very nice and clear printing. Gas (Grid Current)Test: Passed. Mutual Conductance (GM)Test: 50 & 49 and 50 & 52 (49 = Average NOS and 32 = Good MINIMUM).
eBay
RCA Mullard 12AX7A ECC83 Audio Tube. SMOOTH PLATE RARE. Made in Great Britain. 1940, 40s, 1950, 50s, 1960, 60s, 1970, 70s. Tube(s) shown in pictures will be the exact tube(s) you will receive.
eBay
Side Square Getter. Labeled as Conn. Made in 1965 in USA. Tightly balanced and very strong tube! Date code: 65-??. where minimum good value is 1950. Tested in my preamplifier to make sure working as intended with no issues at all.
eBay