Sovtek 12AX7 12AX7A ECC83 7025 Triple 3 Mica Vacuum Tube 6SD7GT T04 This matched pair of Ken-Rad

This matched pair of Ken-Rad 6C6 tubes tested 46 and 50

These nine National Union number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

This Zenith 5Y4G rectifier tube tested 57/54 where minimum (65%) is 40/40 and 100% is 62/62

It is dead quiet when the preamp is muted and have excellent frequency response and dynamics

It measured a nearly-perfectly-balanced 84/82 where minimum (65%) is 50/50 and 100% is 77/77

Sovtek 12AX7 12AX7A ECC83 7025 Triple 3 Mica Vacuum Tube 6SD7GT T04 This matched pair of Ken-RadThis Sovtek 7025 (lower gain 12AX7 ECC83) 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 44 where minimum (65%) is 32 32 and 100% 66 66. It has outstanding silkscreening; a third mica spacer for increased vibration resistance and lowered microphonics; was made in China; has excellent flashing and a foil getter. I am playing it in one of my ArtSound single