JJ / Groove Tubes 12AX7 ECC83 7025 GTECC83 Vacuum Tube Vacuum Tube Valves new in box Sylvania 12AV7

new in box Sylvania 12AV7 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box National Union 14X7 -- and another just like it -- tested to spec on our Paul Hart-calibrated TV7/U

They have 4-48 188-5 and 5-43 188-5 date/provenance codes

nostalgic-looking matched pair of GE 6P5G triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Realistic / Radio Shack-BRANDED 12AU6 tube tested to spec on our Paul Hart-calibrated TV7/U

JJ / Groove Tubes 12AX7 ECC83 7025 GTECC83 Vacuum Tube Vacuum Tube Valves new in box Sylvania 12AV7This JJ MANUFACTURED, Groove Tubes LABELED 12AX7 7025 GTECC83S dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and it measured 36 46 where minimum (65%) is 32 32 and 100% is 49 49. It has excellent silkscreening; excellent flashing and an O getter. I am playing it in my Pro Ject Tube Box S phono preamplifier with an Ortofon X5 MC high output moving coil cartridge as I write and