Sylvania 12AU7 12AU7A NOS-Testing Copper Support Rods Triple 3 Mica For Your Bottlehead Univalve Chad Mitchell Trio This lot of three Ken-Rad

This lot of three Ken-Rad 6D6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This album is in very nice shape with a few pops and ticks

Tube One (missing centering pin / keyway): Tube Two:

It sounds very good with an occasional pop and tick audible in the pianissimo passages

Sylvania 12AU7 12AU7A NOS-Testing Copper Support Rods Triple 3 Mica For Your Bottlehead Univalve Chad Mitchell Trio This lot of three Ken-RadThis 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