Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes NOS NIB X Ray Xray This variety has copper support

This variety has copper support rods

They are dead quiet when just the amplifier is running and have excellent frequency response

I am writing during the first few pianissimo minutes and the surface noise is distracting

I have played them in my Sound Craftsmen RC-2 monoblock amplifiers with adapters (not included) and they sounded outstanding

Matched Pair General Electric GE 6SL7 6SL7GT Vacuum Tubes NOS NIB X Ray Xray This variety has copper supportThis matched pair of new old stock, new in box (For Tube One) 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 45 38 while Tube Two measured 42 41 where minimum (65%) is 32 32 49 49. They have steel plates; steel support rods; 59 43 188 5 and 5 48 188 5 date provenance codes; solid top mica spacers; side harp getters; tall bases; medium bottles and