In addition, these tubes have the black T-plates secured with 3 rivets instead of the usual 2 rivets/holes (holes are the hollow center part of the T-plate rivets). Both tubes test very strong, well above NOS.
Item Tag: SYLVANIA
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Matched Pair of Sylvania 7027A NOS NIB Vacuum Tubes
Pair of NOS Sylvania 7027A tubes, with original boxes. A perfect Gm match, and about a 6mA difference in plate current, as tested on the Amplitrex AT1000. Number 7027A. Actual manufacturer Sylvania.
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Matched Pair +1 Sylvania 6SN7 Staggered Black Plate Tubes Balanced STRONG 3pcs
Note – there are no markings on the glass, the markings have faded or rubbed-off. Sylvania 6SN7GT. Matched Pair +1.
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Matched Pair Sylvania 6L6G Smoke Glass Vacuum Tubes Amplitrex Tested Strong
Both tested strong on an Amplitrex AT1000 tube tester with the following results (as photographed): Tube 1- 83% ip 89% gm Tube 2- 72% ip 72% gm
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Matched Pair Sylvania 6L6G Smoke Glass Vacuum Tubes Amplitrex NOS Same Dates
Both tested NOS and matched using an Amplitrex AT1000 tube tester with the following results (as photographed): Tube 1-106% ip 98% gm Tube 2- 92% ip 93% gm Both have identical 452 date codes
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2 Sylvania 12AX7 7025 ECC83 Quad McIntosh Scott Fisher preamplifier Pilot Tubes
2 Amperex 12AX7 tubes. These tubes were tested on my Hickok TV7 tube tester. The minimum good number for these tubes is 32 They tested at 64-65 and 46-51. They still have lots of life in them.
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7025 SYLVANIA 17MM PLATE VINTAGE TUBE 12AX7 NOS NIB (1973) *eTRACER* #12L
Tube tested very well on our eTracer & Hickok 800A testers. Triode #1 – Plate Current = 1.01mA Rp = 74480 Gm = 1524 Mu = 102.6 Corners = PASS. Triode #2 – Plate Current = 0.99mA Rp = 71938 Gm = 1428 Mu = 104.5 Corners = PASS.
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1960’s 12AX7 7025 Sylvania Tube Gray Short Plate O Getter TV7 Test NOS SY-5
Triode:1 Tested NOS: 65/ 32 Baseline. Triode: 2 Tested NOS: 60/ 32 Baseline. 12AX7 Minimum Range: 32. 12AX7 Nos Range 45 +. Top O Getter. 12AX7A / ECC83 SYLVANIA Tube. Made In USA. No universal test result defines NOS.
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7025/12AX7A NOS/NIB Sylvania 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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(2) Super Strong Sylvania Yellow Label 12AX7 7025 Tubes Tested On TV7-D/U
Tested on calibrated TV7-D/U military where a reading of 32/32 = 65% these tubes tested 59/71 & 47-57. Super strong as usual for Sylvania yellow labels.