Marshall 12AX7 ECC83 Triple Mica Vacuum Tube Gray Silver Bottles These two have great pipes

These two have great pipes

This West German Amperex-MANUFACTURED

The default setting is one

new in box US-made 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Marshall 12AX7 ECC83 Triple Mica Vacuum Tube Gray Silver Bottles These two have great pipesThis Marshall 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 as follows: 40 39 where minimum (65%) is 32 32 and 100% is 49 49. This tube has excellent flashing; steel plates; a square, top, dimpled sheet getter and an additional mica spacer for lowered microphonics.. I am playing it in one of my ArtSound single ended 805 monoblocks with Steely Dans