Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal Their internal structures are all

Their internal structures are all the same

It is somewhat microphonic

They have shoulder / ST bottles

(New 6GU7s typically test from within a half standard deviation of 2000 micromhos and the Jackson expresses this in terms of a percentage

Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal Their internal structures are allThis beautiful new old stock, new in box (for Tube One) matched pair of RCA 6C8G dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 50 52 for Tube One and 53 52 for Tube Two where minimum (65%) is 25 25 and 100% is 39 39. They have dimpled, sheet getters; wire snubbers for lowered microphonics; smooth round bottom and top mica spacers; dark gray rounded