Sylvania 6SL7GT - These were issued to the Army in 1944 and were left in Europe at the end of World War II. Undisturbed for over 50 years in a warehouse until I picked 'em up during a tube hunting trip. Great sounding tube with nice detail and air, quiet, and durable.
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/Buffer 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.