JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G US-made 7C7 tubes in this

US-made 7C7 tubes in this lot

They measured 39

round mica spacers and anode radiators for cooler tube operation and longer life

This tube has a bottom D getter and an E9M date code which means it was likely made by Sylvania

This Raytheon 0Z4 regulator tube tested to spec in our Paul Hart-calibrated TV7/U tube tester

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G US-made 7C7 tubes in thisThis JJ 12AX7 ECC83 ECC83S 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 40 30 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 it is absolutely silent. WE HAVE