Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes FU7 Musical Paradise Gain (Mu (µ): 24 /

Gain (Mu (µ): 24 / 23

new in box RCA 6EH5 tubes tested to spec on our Paul Hart-calibrated TV7/U

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine

These two Hytron 7C4 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 72/74 while Tube Two (Zenith-LABELED) measured 74/73 where minimum (65%) is 50/50 and 100% is 77/77

Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes FU7 Musical Paradise Gain (Mu (µ): 24 /This matched pair of GE 6SL7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 28 35 while Tube Two measured 37 30 where minimum (65%) is 32 32 49 49. They have steel plates; steel support rods; 0 26 188 5 and 8 52 188 5 date provenance codes; solid top mica spacers; side harp getters; tall bases; medium bottles and excellent flashing. I am playing them as I