4 Sylvania 12SN7GT 3-hole bad-boy tubes. on anAmplitrex AT1000 in fixed bias mode. AT1000 test results Good used testing and great sounding tubes. Tubes ran-in 5 min ea. before tests to ensure stability.
Item Tag: SYLVANIA
-
NOS NIB Sylvania JAN 6189W/12AU7WA Matched Pair 10K Preamp Tubes Case Fresh
The price listed is for 2 tubes.
-
(2) Sylvania 12AX7A ECC83 Preamp Tubes Gray Plates O Getters Tests NOS Amplitrex
(2) Sylvania 12AX7A ECC83 Preamp Tubes | Gray Plates | O Getters. Tested on an Amplitrex AT1000.
-
Sylvania JAN CHS 6SL7GT VT-229 Bad Boy NOS 1952 – 51 Matched Pair
Excellent pair 1951 and 1952 Sylvania CHS 6SL7GT preamp tubes. Min good value is 32 for these tubes.
-
NOS JAN Sylvania 5814A Code-Matched Quad 10-74 Platinum Matched Low Noise
These are closely matched for both gain/mu and mA/V transconductance, with very strong low-noise results. This quad is very tightly matched on mA/V, with all sections testing between 1.50 and 1.54 mA/V.
-
True NOS Gold 3-Mica SYLVANIA 6189/12au7 Tubes Maxi PreAmp 2 Tested M0371
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.
-
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.
-
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.