This is a really nice pair of Tung-Sol 6SL7GT tubes. They feature matching date codes, VT-229 military designation, black glass, and the popular round mica on top. One of the tubes has a crack in the base, but this is purely cosmetic and has no impact on performance! Minimum transconductance (Gm) on the Amplitrex tester is 1.2 and NOS tubes typically test around 1.5. These tubes are well matched (and above NOS spec) at 1.6/1.7 and 1.7/1.7.

TESTING: The tube(s) in this sale have been tested on an Amplitrex AT-1000 tube tester (fixed-bias mode), which is a laboratory-grade tester capable of supplying the user with precision measurements. It tests for heater-cathode leakage, gas, mutual conductance, and plate current. Please note that no tube testers are identical and my test results will likely differ slightly from yours.

RETURNS: I will gladly take your tube(s) back for a full refund if you're unhappy for any reason. Yes, it's that simple! Please note that I reserve the right to issue partial refunds if tubes are missing, damaged, or without original boxes (when applicable).

OTHER TUBES FOR SALE:  I have many premium tubes for sale and will combine shipping if you buy multiple items.  Click the links below to see what else is available!