Sound Profile; The Sylvania (gold lettering, 3-Mica) JHS 6189 (a military-grade 12AU7WA variant), Users describe describe it as having “good detail without edge,” providing a clear yet non-fatiguing listening experience.
Item Tag: SYLVANIA
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Sylvania 6V6GTA Tube Smoked Glass USA Tested Strong & Box Fender Princeton Champ
Another classic audio tube. Possibly NOS, but may have been used for testing. Model 257 tester on 6/25/26. Excellent, original box.
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Massive Vintage Tube Lot – Fender, GE, ЈЈ, JAN, Sylvania, Sovtek – 150+ Tubes +
Tubes are untested and sold as-is. Rare military-grade JAN tubes with gold pins.
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Pair Sylvania Black Plate Chrome Top 6SN7GTB Tubes STRONG! 6SN7
These tubes test 86/86 and 88/88 where a new tube tests 85/85.
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(2) Sylvania 6SN7GT Chrome Dome 3 Hole Black Plate Matched Codes 1953 Strong
Tube 1 Emissions 82% & 90% | GM 107% & 107%. Tube 2 Emissions 81% & 81% | GM 100% & 103%.
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Sylvania JAN 6SN7WGTA Black Plate NOS matching date pair Tested USA
These are 6SN7WGTA tubes which are the ruggedized version of the 6SN7GTA. They can be used in applications calling for the 6SN7GT and 6SN7GTA. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure-test at 3250-3250 and 3250-3125 where pass/fail is 1625 micromho.
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5 NOS Vintage Black Sylvania 7-Pin Vacuum Tube Sockets 28.5mm mounting (Qty)
Mounting holes are about 18.5mm, or 1 1/8″ apart.
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(2) Sylvania Philco Type 45 Tubes Black Plates Foil Getters 1936 Tests NOS
(2) Sylvania Philco Type 45 Power Tubes | Black Plates | Foil Getters | Matched Date Codes 2U | 1936 Production.