Sylvania 12AU7 12AU7A NOS-Testing Copper Support Rods Triple 3 Mica Vacuum Tube For Your Bottlehead Univalve T15 T03 This matched pair of RCA-MANUFACTURED

This matched pair of RCA-MANUFACTURED 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

round top mica and rectangular bottom spacers

5 record cleaner and then played on our Rega Planar 3 with an Ortofon X5-MC cartridge on an RB-300 tone arm with a Cern Audio phono stage feeding our Musical Paradise MP-301 single-ended integrated amplifier which drives PSB Alpha Minis

These three Ken-Rad 1A7GT tubes tested to spec on our Paul Hart-calibrated TV-7/U

Sylvania 12AU7 12AU7A NOS-Testing Copper Support Rods Triple 3 Mica Vacuum Tube For Your Bottlehead Univalve T15 T03 This matched pair of RCA-MANUFACTUREDThis Sylvania triple mica 12AU7A ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 73 79 where new nominal is 50 50. This tube has two additional vertical support rods; an additional mica spacer for low microphonics; crenelated, round mica spacers and excellent flashing. I have played it in my Bottlehead Crack headphone amplifier and it sounds