JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G rectangular bottom mica

rectangular bottom mica

US-made 7C7 tubes in this lot

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

Its diodes measured 54 and 42

JJ 12AX7 ECC83 ECC83S Low Noise Vacuum Tube 25A6 25A6G rectangular bottom micaThis 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