JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G This Raytheon 0Z4 regulator tube

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

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

GE-LABELED 6AQ8 / ECC85 tube was tested on our Paul Hart-calibrated TV7/U for shorts

These two National Union clear bottle type / number 41 tubes tested as follows on our Paul Hart-calibrated TV7/U:

US-made 7C7 tubes in this lot

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G This Raytheon 0Z4 regulator tubeThis 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