Both tested NOS matched on a professionally calibrated TV7B/U tube tester with the following results (32 is minimum): Tube 1- 54/54 Tube 2- 56/56
Item Category: Vintage Electronics
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(2) Sylvania JAN-12AX7WA Mil Spec Tubes Gray Plate O Getters Tests Strong TV-7BU
(2) Sylvania JAN-12AX7WA Military Spec Preamp Tubes | Gray Plates | O Getters. Tube 1 tests at 52/54 and tube 2 at 46/50 with 32 being the minimum score for a good tube (with 65% life remaining).
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United Electron 12AX7 ECC83 West Germany Tube RFT TESTED
I think this is an RFT brand tube. Use your own judgement on pictures. Tested on Sencore MU140. 90 is new tube on tester. 88/89
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(1) Mullard 7025 ECC83 12AX7 Tube (GE Branded) NOS NIB!
(1) Mullard 7025. Made by Mullard for GE. Large halo getter. This is also known as a CV4004/ECC83 tube type. The printing on this tube is in superb condition as seen in the photos. Highly sought after and very rare in NOS form.
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MULLARD ECC83 BLACKBURN 12AX7 MC1 LONG PLATE TIGHT BAL TEST NOS VINTAGE 1957
Average NOS test results for 12AX7’s 1250 microhmos on the Hickok 600A.
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12AX7 TUBE SYLVANIA TESTED & BOXED VINTAGE COMMERCIAL SURPLUS
Boxes might show wear from being in storage. Everything can be resolved without leaving a negative feed back. PRICES BASED ON AVERAGE SOLD PRICES. Call for technical specs.
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12AX7/ECC83 Siemens Tall Plate MaxiPreamp2/TV7 Tested (1)Tube Lot
I test all tubes thoroughly and with great care. I test to the best of my ability, and I report all results honestly.
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Pair of Tungsram (GT label) 12AX7 ECC83 Vacuum Tubes #1
Tested on the Amplitrex AT1000, with results shown in the table below. Actual manufacturer Tungsram. Number 12AX7. Small signal (i.e. 12AX7) tubes are generally checked for noise and microphonics; power tubes (i.e. 6L6) are usually not.
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NOS Pair RCA 12AX7A ECC83 Made in Japan Short Gray Plates Tests NOS Amplitrex
NOS Pair RCA 12AX7A ECC83 Preamp Tubes | Made in Japan | Short Gray Plates | Halo Getters. Tested on an Amplitrex AT1000.
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NOS Mullard 12AX7 Tube
NOS Mullard 12AX7 Tube, cany read the brand that Mullard made this for but you can clearly see the Made in Great Britain imprint. Tested on a Orange MKII Value Tester and it tested 10.