Matched Pair RCA 12SN7 12SN7GT Vacuum Tubes 6097 new in box GE 38HE7

new in box GE 38HE7 tubes tested to spec on our Paul Hart-calibrated TV7/U

This paperback book is in very good condition

Transconductance measured 40

Converter 12BE6

5 record cleaner and then played it on my He-Man Rig which consists of a Rega Planar Three with an Ortofon X5-MC cartridge on an RB-300 tone arm with a Valee PA-12B phono preamp / preamp feeding two ArtSound 805 monoblocks

Matched Pair RCA 12SN7 12SN7GT Vacuum Tubes 6097 new in box GE 38HE7This new old stock testing matched pair of RCA 12SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 76 69 for Tube One and 77 74 for Tube Two. Minimum (65%) is 50. They have black plates; tall bases; D getters; steel support rods and KR and MC date codes, respectively. I am playing them as I write in my Alan Eaton single ended 45 amplifier with