Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal O getter and an 805

O getter and an 805 ACP date / provenance code

This hardcover book is in fair condition

These four Philco engraved base number / type 27 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Their internal structures are all the same

Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal O getter and an 805This 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