RCA 6SL7GT/VT-229 - 1942 vintage. I found these in Europe. Like the 1944 vintage Sylvanias, these were left there by the U.S. Army after World War II, completely undisturbed in warehouses. The boxes say "Western Electric," but the octagon etched on the glass tells us they are RCA. Well... so does the RCA logo on the base of the tube... Great sounding tube that's quiet with nice detail and clarity.
Platinum grade - The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.
Gold grade - Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.
Driver grade - Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.
This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.
Logo quality may vary from picture above. Price includes matching in any quantity you need at no extra charge.