Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal They have shoulder / ST

They have shoulder / ST bottles

This hardcover book is in fair condition

new in box RCA 4GJ7 / XCF801 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

This Sylvania milspec / industrial 5814 / 12AU7 / ECC82 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair RCA 6C8 6C8G Vacuum Tubes Valves 6SL7 Substitute NOS NIB XXD Loktal They have shoulder / STThis 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